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Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

High voltage dry-type air-core shunt reactors  

Science Journals Connector (OSTI)

Dry-type air-core shunt reactors are now being ... systems to limit overvoltages. Recently, high voltage dry-type air-core shunt reactors have been designed, ... transient overvoltages and electrical and magnetic...

Klaus Papp; Michael R. Sharp…

2014-11-01T23:59:59.000Z

2

Regional protection scheme designed for low-voltage micro-grids  

Science Journals Connector (OSTI)

Abstract No selective protection exists in the low-voltage level micro-grid integrated with DG presently. To deal with this problem, a new type of micro-grid protection scheme based on fault component is put forward. To implement this scheme, the micro-grid is divided into several regions, and each region is regarded as the target of protection. As a result, not only the scope of outage is decreased in accordance with the action of the protection, but the economic requirement of protection arrangement is met. Taking the negative sequence component as the basic characteristic quantity, a variety of asymmetric faults effectively can be identified successfully. Considering the adverse effects of unbalanced load and the switching of large capacity single phase load, a low-voltage supplement criterion is introduced. The effectiveness of this protection scheme is verified with EMTDC based simulation tests.

Xiangning Lin; Rui Zhang; Ning Tong; Xianshan Li; Ming Li; Dexian Yang

2015-01-01T23:59:59.000Z

3

Methods, systems and apparatus for controlling third harmonic voltage when operating a multi-space machine in an overmodulation region  

SciTech Connect

Methods, system and apparatus are provided for controlling third harmonic voltages when operating a multi-phase machine in an overmodulation region. The multi-phase machine can be, for example, a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided. For example, when the reference voltage vector is determined to be within the overmodulation region, an angle of the reference voltage vector can be modified to generate a reference voltage overmodulation control angle, and a magnitude of the reference voltage vector can be modified, based on the reference voltage overmodulation control angle, to generate a modified magnitude of the reference voltage vector. By modifying the reference voltage vector, voltage command signals that control a five-phase inverter module can be optimized to increase output voltages generated by the five-phase inverter module.

Perisic, Milun; Kinoshita, Michael H; Ranson, Ray M; Gallegos-Lopez, Gabriel

2014-06-03T23:59:59.000Z

4

Fault current limiting and voltage sag mitigation by means of a resonant type FCL  

Science Journals Connector (OSTI)

In this paper a resonant type of fault current limiter and its application are presented. During normal operation of circuit, the thyristors is off and the resonant branches are short circuit. Therefore there is not any voltage drop on FCL. In this way, ... Keywords: bypass resistance, fault analysis, power quality, resonant type fault current limiter

M. S. Mohebbi Nazar; M. Abapour

2006-08-01T23:59:59.000Z

5

Electric Field Calculations on Dry-Type Medium Voltage Current Transformers.  

E-Print Network (OSTI)

??This research presents potential and electric field calculations on medium voltage (MV) epoxy insulated outdoor current transformers (CTs) using a numeri-cal calculation approach. Two designs… (more)

Lakshmichand Jain, Sandeep Kumar

2012-01-01T23:59:59.000Z

6

Formal Type Soundness for Cyclone's Region System Dan Grossman  

E-Print Network (OSTI)

management of Cyclone and its static typing discipline. The design incorporates several advance- mentsFormal Type Soundness for Cyclone's Region System Dan Grossman Greg Morrisett Trevor Jim Mike Hicks Yanling Wang James Cheney November 2001 Abstract Cyclone is a polymorphic, type-safe programming language

Hicks, Michael

7

Magnetoresistance of p-Type Si in the Hopping Region  

Science Journals Connector (OSTI)

The magnetoresistance in the hopping region of B-doped Si was found to be negative. This contrasts with the behavior in n-type Ge, where a positive magnetoresistance is characteristic of the hopping conduction region. No anisotropy is observed in fields up to 17 kG in the p-type Si. The resistance tends to saturate at about 15 kG. The change in dc resistance at that field is about 10% from the zero-field value.

M. Pollak and D. H. Watt

1963-02-15T23:59:59.000Z

8

Semiconductor systems utilizing materials that form rectifying junctions in both N and P-type doping regions, whether metallurgically or field induced, and methods of use  

DOE Patents (OSTI)

Disclosed are semiconductor systems, such as integrated circuits utilizing Schotky barrier and/or diffused junction technology, which semiconductor systems incorporate material(s) that form rectifying junctions in both metallurgically and/or field induced N and P-type doping regions, and methods of their use. Disclosed are Schottky barrier based inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems and which can be operated as modulators, N and P-channel MOSFETS and CMOS formed therefrom, and (MOS) gate voltage controlled rectification direction and gate voltage controlled switching devices, and use of such material(s) to block parasitic current flow pathways. Simple demonstrative five mask fabrication procedures for inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems are also presented.

Welch, James D. (10328 Pinehurst Ave., Omaha, NE 68124)

2000-01-01T23:59:59.000Z

9

Ancillary service details: Voltage control  

SciTech Connect

Voltage control is accomplished by managing reactive power on an alternating-current power system. Reactive power can be produced and absorbed by both generation and transmission equipment. Reactive-power devices differ substantially in the magnitude and speed of response and in their capital costs. System operators, transmission owners, generators, customers, power marketers, and government regulators need to pay close attention to voltage control as they restructure the U.S. electricity industry. Voltage control can affect reliability and commerce in three ways: (1) Voltages must be maintained within an acceptable range for both customer and power-system equipment to function properly. (2) The movement of reactive power consumes transmission resources, which limits the ability to move real power and worsens congestion. (3) The movement of reactive power results in real-power losses. When generators are required to supply excessive amounts of reactive power, their real-power production must be curtailed. These opportunity costs are not currently compensated for in most regions. Current tariffs are based on embedded costs. These embedded-cost tariffs average about $0.51/MWh, equivalent to $1.5 billion annually for the United States as a whole. Although this cost is low when compared with the cost of energy, it still aggregates to a significant amount of money. This report takes a basic look at why the power system requires reactive power (an appendix explains the fundamentals of real and reactive power). The report then examines the various types of generation and transmission resources used to supply reactive power and to control voltage. Finally it discusses how these resources are deployed and paid for in several reliability regions around the country. As the U.S. electricity industry is restructured, the generation, transmission, and system-control equipment and functions that maintain voltages within the appropriate ranges are being deintegrated.

Kirby, B.; Hirst, E.

1997-12-01T23:59:59.000Z

10

Impacts of Regional Electricity Prices and Building Type on the Economics of Commercial Photovoltaic Systems  

SciTech Connect

To identify the impacts of regional electricity prices and building type on the economics of solar photovoltaic (PV) systems, 207 rate structures across 77 locations and 16 commercial building types were evaluated. Results for expected solar value are reported for each location and building type. Aggregated results are also reported, showing general trends across various impact categories.

Ong, S.; Campbell, C.; Clark, N.

2012-12-01T23:59:59.000Z

11

Low-voltage gyrotrons  

SciTech Connect

For a long time, the gyrotrons were primarily developed for electron cyclotron heating and current drive of plasmas in controlled fusion reactors where a multi-megawatt, quasi-continuous millimeter-wave power is required. In addition to this important application, there are other applications (and their number increases with time) which do not require a very high power level, but such issues as the ability to operate at low voltages and have compact devices are very important. For example, gyrotrons are of interest for a dynamic nuclear polarization, which improves the sensitivity of the nuclear magnetic resonance spectroscopy. In this paper, some issues important for operation of gyrotrons driven by low-voltage electron beams are analyzed. An emphasis is made on the efficiency of low-voltage gyrotron operation at the fundamental and higher cyclotron harmonics. These efficiencies calculated with the account for ohmic losses were, first, determined in the framework of the generalized gyrotron theory based on the cold-cavity approximation. Then, more accurate, self-consistent calculations for the fundamental and second harmonic low-voltage sub-THz gyrotron designs were carried out. Results of these calculations are presented and discussed. It is shown that operation of the fundamental and second harmonic gyrotrons with noticeable efficiencies is possible even at voltages as low as 5-10 kV. Even the third harmonic gyrotrons can operate at voltages about 15 kV, albeit with rather low efficiency (1%-2% in the submillimeter wavelength region).

Glyavin, M. Yu.; Zavolskiy, N. A.; Sedov, A. S. [Institute of Applied Physics RAS, N. Novgorod 603600 (Russian Federation); Nusinovich, G. S. [IREAP, University of Maryland, College Park, Maryland 20742-3511 (United States)

2013-03-15T23:59:59.000Z

12

AEO2011: Coal Minemouth Prices by Region and Type | OpenEI  

Open Energy Info (EERE)

Minemouth Prices by Region and Type Minemouth Prices by Region and Type Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is Table 141, and contains only the reference case. The dataset uses million short tons and the US Dollar. The data is broken down into northern Appalachia, central Appalachia, southern Appalachia, eastern interior, western interior, Gulf, Dakota medium, western Montana, Wyoming, Rocky Mountain, Arizona/New Mexico and Washington/Alaska. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO Coal Minemouth Prices EIA Data application/vnd.ms-excel icon AEO2011: Coal Minemouth Prices by Region and Type- Reference Case (xls, 121.6 KiB)

13

AEO2011: Coal Production by Region and Type | OpenEI  

Open Energy Info (EERE)

by Region and Type by Region and Type Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is Table 140, and contains only the reference case. The unit of measurement in this dataset is million short tons. The data is broken down into northern Appalachia, central Appalachia, southern Appalachia, eastern interior, western interior, gulf, Dakota medium, western montana, Wyoming, Rocky Mountain, Arizona/New Mexico and Washington/Alaska. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO Coal Production EIA Data application/vnd.ms-excel icon AE2011: Coal Production by Region and Type- Reference Case (xls, 122.3 KiB)

14

Thermophotovoltaic energy conversion system having a heavily doped n-type region  

DOE Patents (OSTI)

A thermophotovoltaic (TPV) energy conversion semiconductor device is provided which incorporates a heavily doped n-type region and which, as a consequence, has improved TPV conversion efficiency. The thermophotovoltaic energy conversion device includes an emitter layer having first and second opposed sides and a base layer in contact with the first side of the emitter layer. A highly doped n-type cap layer is formed on the second side of the emitter layer or, in another embodiment, a heavily doped n-type emitter layer takes the place of the cap layer.

DePoy, David M. (Clifton Park, NY); Charache, Greg W. (Clifton Park, NY); Baldasaro, Paul F. (Clifton Park, NY)

2000-01-01T23:59:59.000Z

15

Some inferences on the role of lower positive charge region in facilitating different types of lightning  

E-Print Network (OSTI)

of lightning Amitabh Nag1 and Vladimir A. Rakov1 Received 24 November 2008; revised 22 January 2009; accepted 3'' the potential cloud-to-ground flash to an intracloud (or cloud-to-air) one. Assuming that the preliminary with the lower positive charge region, we qualitatively examine the inferred dependence of lightning type

Florida, University of

16

" by Type of Supplier, Census Region, Census Division, Industry Group,"  

U.S. Energy Information Administration (EIA) Indexed Site

3. Average Prices of Purchased Electricity and Steam" 3. Average Prices of Purchased Electricity and Steam" " by Type of Supplier, Census Region, Census Division, Industry Group," " and Selected Industries, 1994" " (Estimates in Dollars per Physical Units)" ,," Electricity",," Steam" ,," (kWh)",," (million Btu)" ,,,,,,"RSE" "SIC",,"Utility","Nonutility","Utility","Nonutility","Row" "Code(a)","Industry Group and Industry","Supplier(b)","Supplier(c)","Supplier(b)","Supplier(c)","Factors"

17

The metal abundance of circumnuclear star forming regions in early type spirals. Spectrophotometric observations  

E-Print Network (OSTI)

We have obtained long-slit observations in the optical and near infrared of 12 circumnuclear HII regions (CNSFR) in the early type spiral galaxies NGC 2903, NGC 3351 and NGC 3504 with the aim of deriving their chemical abundances. Only for one of the regions, the [SIII] $\\lambda$ 6312 \\AA was detected providing, together with the nebular [SIII] lines at $\\lambda\\lambda$ 9069, 9532 \\AA, a value of the electron temperature of T$_e$([SIII])= 8400$^{+ 4650}_{-1250}$K. A semi-empirical method for the derivation of abundances in the high metallicity regime is presented. We obtain abundances which are comparable to those found in high metallicity disc HII regions from direct measurements of electron temperatures and consistent with solar values within the errors. The region with the highest oxygen abundance is R3+R4 in NGC 3504, 12+log(O/H) = 8.85, about 1.5 solar if the solar oxygen abundance is set at the value derived by Asplund et al. (2005), 12+log(O/H)$_{\\odot}$ = 8.66$\\pm$0.05. Region R7 in NGC 3351 has the lowest oxygen abundance of the sample, about 0.6 times solar. In all the observed CNSFR the O/H abundance is dominated by the O$^+$/H$^+$ contribution, as is also the case for high metallicity disc HII regions. For our observed regions, however, also the S$^+$/S$^{2+}$ ratio is larger than one, contrary to what is found in high metallicity disc HII regions for which, in general, the sulphur abundances are dominated by S$^{2+}$/H$^+$...

Angeles I. Diaz; Elena Terlevich; Marcelo Castellanos; Guillermo F. Hagele

2007-09-08T23:59:59.000Z

18

Water deuterium fractionation in the inner regions of two solar type protostars  

E-Print Network (OSTI)

The [HDO]/[H2O] ratio is a crucial parameter for probing the history of water formation. So far, it has been measured for only three solar type protostars and yielded different results, possibly pointing to a substantially different history in their formation. In the present work, we report new interferometric observations of the HDO 4 2,2 - 4 2,3 line for two solar type protostars, IRAS2A and IRAS4A, located in the NGC1333 region. In both sources, the detected HDO emission originates from a central compact unresolved region. Comparison with previously published interferometric observations of the H218$O 3 1,3 - 2 2,0 line shows that the HDO and H$_2$O lines mostly come from the same region. A non-LTE LVG analysis of the HDO and H218$O line emissions, combined with published observations, provides a [HDO]/[H2O] ratio of 0.3 - 8 % in IRAS2A and 0.5 - 3 % in IRAS4A. First, the water fractionation is lower than that of other molecules such as formaldehyde and methanol in the same sources. Second, it is similar t...

Taquet, Vianney; Ceccarelli, Cecilia; Neri, Roberto; Kahane, Claudine; Coutens, Audrey; Vastel, Charlotte

2013-01-01T23:59:59.000Z

19

Spatial Variation of Soil Type and Soil Moisture in the Regional Atmospheric Modeling System  

SciTech Connect

Soil characteristics (texture and moisture) are typically assumed to be initially constant when performing simulations with the Regional Atmospheric Modeling System (RAMS). Soil texture is spatially homogeneous and time-independent, while soil moisture is often spatially homogeneous initially, but time-dependent. This report discusses the conversion of a global data set of Food and Agriculture Organization (FAO) soil types to RAMS soil texture and the subsequent modifications required in RAMS to ingest this information. Spatial variations in initial soil moisture obtained from the National Center for Environmental Predictions (NCEP) large-scale models are also introduced. Comparisons involving simulations over the southeastern United States for two different time periods, one during warmer, more humid summer conditions, and one during cooler, dryer winter conditions, reveals differences in surface conditions related to increases or decreases in near-surface atmospheric moisture con tent as a result of different soil properties. Three separate simulation types were considered. The base case assumed spatially homogeneous soil texture and initial soil moisture. The second case assumed variable soil texture and constant initial soil moisture, while the third case allowed for both variable soil texture and initial soil moisture. The simulation domain was further divided into four geographically distinct regions. It is concluded there is a more dramatic impact on thermodynamic variables (surface temperature and dewpoint) than on surface winds, and a more pronounced variability in results during the summer period. While no obvious trends in surface winds or dewpoint temperature were found relative to observations covering all regions and times, improvement in surface temperatures in most regions and time periods was generally seen with the incorporation of variable soil texture and initial soil moisture.

Buckley, R.

2001-06-27T23:59:59.000Z

20

Trench process and structure for backside contact solar cells with polysilicon doped regions  

DOE Patents (OSTI)

A solar cell includes polysilicon P-type and N-type doped regions on a backside of a substrate, such as a silicon wafer. An interrupted trench structure separates the P-type doped region from the N-type doped region in some locations but allows the P-type doped region and the N-type doped region to touch in other locations. Each of the P-type and N-type doped regions may be formed over a thin dielectric layer. Among other advantages, the resulting solar cell structure allows for increased efficiency while having a relatively low reverse breakdown voltage.

De Ceuster, Denis; Cousins, Peter John; Smith, David D

2014-03-18T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Trench process and structure for backside contact solar cells with polysilicon doped regions  

DOE Patents (OSTI)

A solar cell includes polysilicon P-type and N-type doped regions on a backside of a substrate, such as a silicon wafer. An interrupted trench structure separates the P-type doped region from the N-type doped region in some locations but allows the P-type doped region and the N-type doped region to touch in other locations. Each of the P-type and N-type doped regions may be formed over a thin dielectric layer. Among other advantages, the resulting solar cell structure allows for increased efficiency while having a relatively low reverse breakdown voltage.

De Ceuster, Denis; Cousins, Peter John; Smith, David D

2013-05-28T23:59:59.000Z

22

Classification of Hepatitis C Virus Type 2 Isolates by Phylogenetic Analysis of Core and NS5 Regions  

Science Journals Connector (OSTI)

...Virus Type 2 Isolates by Phylogenetic Analysis of Core and NS5 Regions Mauro Pistello Fabrizio Maggi Claudia Fornai Alessandro Leonildi Antonietta Morrica Maria Linda Vatteroni Mauro Bendinelli Retrovirus Center and Virology Section Department of Biomedicine...

Mauro Pistello; Fabrizio Maggi; Claudia Fornai; Alessandro Leonildi; Antonietta Morrica; Maria Linda Vatteroni; Mauro Bendinelli

1999-06-01T23:59:59.000Z

23

THE EXTENDED NARROW-LINE REGION OF TWO TYPE-I QUASI-STELLAR OBJECTS  

SciTech Connect

We investigate the narrow-line region (NLR) of two radio-quiet QSOs, PG1012+008 and PG1307+085, using high signal-to-noise spatially resolved long-slit spectra obtained with FORS1 at the Very Large Telescope. Although the emission is dominated by the point-spread function of the nuclear source, we are able to detect extended NLR emission out to several kiloparsec scales in both QSOs by subtracting the scaled central spectrum from outer spectra. In contrast to the nuclear spectrum, which shows a prominent blue wing and a broad line profile of the [O III] line, the extended emission reveals no clear signs of large-scale outflows. Exploiting the wide wavelength range, we determine the radial change of the gas properties in the NLR, i.e., gas temperature, density, and ionization parameter, and compare them with those of Seyfert galaxies and type-II QSOs. The QSOs have higher nuclear temperature and lower electron density than Seyferts, but show no significant difference compared to type-II QSOs, while the ionization parameter decreases with radial distance, similar to the case of Seyfert galaxies, For PG1012+008, we determine the stellar-velocity dispersion of the host galaxy. Combined with the black hole mass, we find that the luminous radio-quiet QSO follows the local M{sub BH}-{sigma}{sub *} relation of active galactic nuclei.

Oh, Semyeong; Woo, Jong-Hak [Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of); Bennert, Vardha N. [Physics Department, California Polytechnic State University San Luis Obispo, CA 93407 (United States); Jungwiert, Bruno [Astronomical Institute, Academy of Sciences of the Czech Republic, Bocni II 1401/1a, CZ-141 31 Prague (Czech Republic); Haas, Martin [Astronomisches Institut, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44801 Bochum (Germany); Leipski, Christian [Max-Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Albrecht, Marcus, E-mail: smoh@astro.snu.ac.kr, E-mail: woo@astro.snu.ac.kr, E-mail: vbennert@calpoly.edu, E-mail: bruno@ig.cas.cz, E-mail: haas@astro.rub.de, E-mail: leipski@mpia-hd.mpg.de, E-mail: malbrecht@astro.uni-bonn.de [Argelander-Institut fuer Astronomie, Auf dem Huegel 71, 53121 Bonn (Germany)

2013-04-20T23:59:59.000Z

24

Paleocene benthonic foraminiferal biostratigraphy, paleobiogeography and paleoecology of Atlantic—Tethyan regions: Midway-type fauna  

Science Journals Connector (OSTI)

The stratigraphic, geographic and bathymetric distribution of some Paleocene benthonic foraminiferal assemblages have been studied in the Tethyan and circum-Atlantic regions within the framework of planktonic foraminiferal zones. Although some species appear to be restricted to either the Tethyan-European area or to the western Atlantic, the majority of species are amphi-Atlantic and Tethyan in distribution. The cosmopolitan distribution is attributed to more equitable climatic conditions (lower polar—equatorial thermal gradient) and warmer, more uniform thermal structure of the oceans and different paleogeographic and paleo-oceanographic conditions. Two main distinct depth-controlled benthonic foraminiferal assemblages (exclusive of the shallow-warm water Tethyan carbonate assemblage) have been recognized in the Paleocene. The continental shelf fauna, termed here the “Midway-type fauna” (MF) is characterized by species of Cibicidoides alleni (Plummer) = propria Brotzen, howelli (Toulmin), succedens (Brotzen), Anomalinoides [acuta (Plummer), midwayensis (Plummer)], Gavelinella [danica (Brotzen), neelyi (Jennings)], and Osangularia plummerae Brotzen, as well as various lagenids (nodosariids, lenticulinids, vaginulinids), polymorphinids and textulariids. A lower continental slope and abyssal plain fauna, termed here the “Velasco-type fauna” (VF), is characterized by, amongst others, Gavalinella [beccariiformis (White), rubiginosa (Cushman), velascoensis (Cushman)], Nuttallides truempy (Nuttall), Nuttallinella florealis (Cushman), velascoensisZ (Cushman)], (Cushman), Aragonia velascoensis (Cushman), nodosariids (N. velascoensis Cushman, Dentalina limbata d'Orbigny), various agglutinated forms [Gaudryina pyramidata Cushman, Tritaxia aspera (Cushman), Dorothia ex. gr. oxycona trinitatensis (Cushman and Renz)], and various gyroidinids and buliminids. Pleuriostomellids and stilostomellids are quantitatively rare and unimportant until the Middle—Late Eocene. This paper discusses the biostratigraphy and biogeography of the “Midway-type fauna”.

W.A. Berggren; Jane Aubert

1975-01-01T23:59:59.000Z

25

Abstract 2322: The KIAA1549:BRAF fusion gene regulates mTOR signaling and gliomagenesis in a cell type- and brain region-specific manner.  

Science Journals Connector (OSTI)

...The KIAA1549:BRAF fusion gene regulates mTOR...gliomagenesis in a cell type- and brain region-specific...region- and cell type-specific growth...also observed in fusion BRAF-associated...The KIAA1549:BRAF fusion gene regulates mTOR...gliomagenesis in a cell type- and brain region-specific...

Aparna Kaul; Yi-Hsien Chen; Ryan J. Emnett; Sonika Dahiya; and David Gutmann

2013-08-14T23:59:59.000Z

26

Development of High Voltage Electron Microscope  

Science Journals Connector (OSTI)

......Cockcroft Walton Type High Voltage Generator. O Power Line O Fig. 4...pressure in the tank to the atmospheric pressure by removing freon...pump using liquid nitrogen. Water buffer and liquid nitrogen...base plate of high voltage generator. Four poles stand on this......

Shinjiro KATAGIRI; Hirokazu KIMURA; Susumu OZASA; Kazumi SHIRAISHI

1969-01-01T23:59:59.000Z

27

Automatic voltage imbalance detector  

DOE Patents (OSTI)

A device for indicating and preventing damage to voltage cells such as galvanic cells and fuel cells connected in series by detecting sequential voltages and comparing these voltages to adjacent voltage cells. The device is implemented by using operational amplifiers and switching circuitry is provided by transistors. The device can be utilized in battery powered electric vehicles to prevent galvanic cell damage and also in series connected fuel cells to prevent fuel cell damage.

Bobbett, Ronald E. (Los Alamos, NM); McCormick, J. Byron (Los Alamos, NM); Kerwin, William J. (Tucson, AZ)

1984-01-01T23:59:59.000Z

28

Solution Structure of Ptu1, a Toxin from the Assassin Bug Peirates turpis That Blocks the Voltage-Sensitive Calcium Channel N-Type  

Science Journals Connector (OSTI)

Ptu1 is a toxin from the assassin bug Peirates turpis which has been demonstrated to bind reversibly the N-type calcium channels and to have lower affinity than the ?-conotoxin MVIIA. We have determined the solution structure of Ptu1 by use of ...

Cédric Bernard; Gerardo Corzo; Amor Mosbah; Terumi Nakajima; Hervé Darbon

2001-10-02T23:59:59.000Z

29

Optical voltage reference  

DOE Patents (OSTI)

An optical voltage reference for providing an alternative to a battery source is described. The optical reference apparatus provides a temperature stable, high precision, isolated voltage reference through the use of optical isolation techniques to eliminate current and impedance coupling errors. Pulse rate frequency modulation is employed to eliminate errors in the optical transmission link while phase-lock feedback is employed to stabilize the frequency to voltage transfer function. 2 figures.

Rankin, R.; Kotter, D.

1994-04-26T23:59:59.000Z

30

Evidence of two different types of short term solar modulation of regional surface temperature and cloud  

E-Print Network (OSTI)

Recent work indicates that 27 day variations in cosmic ray flux during 2007 2009 are phase locked to 27 day variations in cloud and surface temperature at Shetland. Here we extend the study to other regions including Central England, US and Australia and to several other annual intervals that exhibit strong 27 day variation in cosmic ray flux and sunspot area. Band pass filtering was used to obtain 27 day components of daily maximum temperature in each region and 27 day components of cloud variation were determined, in Australia only, from solar exposure records. When cosmic ray flux is the dominant influence phase locked variations in surface temperature occur in each of the regions with, however, in phase or anti phase variation in different regions. Similar phase locking of 27 day variation in surface temperature to sunspot area variation occurs when sunspot activity is the dominant influence with indications that changes from in phase to anti phase variation are linked to flipping of sunspot activity from...

Edmonds, Ian

2014-01-01T23:59:59.000Z

31

fault diagnosis of a high voltage transmission line using waveform ...  

E-Print Network (OSTI)

Oct 4, 2013 ... FAULT DIAGNOSIS OF A HIGH VOLTAGE TRANSMISSION LINE USING ... Fault types such as single line to ground, line to line, double line to ...

Ripunjoy Phukan

2013-10-04T23:59:59.000Z

32

High Voltage Safety Act | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High Voltage Safety Act High Voltage Safety Act High Voltage Safety Act < Back Eligibility Commercial Construction Developer General Public/Consumer Industrial Installer/Contractor Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Georgia Program Type Safety and Operational Guidelines Siting and Permitting The purpose of the High Voltage Safety Act is to prevent injury to persons and property and interruptions of utility service resulting from accidental or inadvertent contact with high-voltage electric lines by providing that no work shall be done in the vicinity of such lines unless and until the owner or operator thereof has been notified of such work and has taken the appropriate safety measures. The Georgia Public Service Commission requires

33

Genomic Imprinting Variations in the Mouse Type 3 Deiodinase Gene Between Tissues and Brain Regions  

E-Print Network (OSTI)

, tissues were dissected, immediately frozen on dry ice and stored at –70 C until further use. Brain regions were identified and harvested according to the mouse atlas by Paxinos (30). Animal procedures were approved by the Institutional Animal Care and Use... paternal, allele. This suggests that expression and associated alterations in chromatin facil- itate homologous recombination. The result is also con- sistent with observations that suggest the existence of epi- genetic boundaries that are associated with a...

Martinez, M. Elena; Charalambous, Marika; Saferali, Aabida; Fiering, Steven; Naumova, Anna K.; St. Germain, Donald; Ferguson-Smith, Anne C.; Hernandez, Arturo

2014-09-18T23:59:59.000Z

34

Property:Nominal Voltage | Open Energy Information  

Open Energy Info (EERE)

Nominal Voltage Nominal Voltage Jump to: navigation, search Property Name Nominal Voltage Property Type Number This is a property of type Number. Pages using the property "Nominal Voltage" Showing 22 pages using this property. D Distributed Generation Study/10 West 66th Street Corp + 480 + Distributed Generation Study/615 kW Waukesha Packaged System + 480 + Distributed Generation Study/Aisin Seiki G60 at Hooligans Bar and Grille + 240 + Distributed Generation Study/Arrow Linen + 480 + Distributed Generation Study/Dakota Station (Minnegasco) + 0 + Distributed Generation Study/Elgin Community College + 4,160 + Distributed Generation Study/Emerling Farm + 480 + Distributed Generation Study/Floyd Bennett + 480 + Distributed Generation Study/Harbec Plastics + 480 +

35

Constant voltage ultracapacitor  

Science Journals Connector (OSTI)

Ultracapacitors have attracted lots of attention recently due to their growing use in hybrid vehicles and in energy storage applications for the smart grid. A very undesirable feature of ultracapacitors is the fact that the voltage drops as the capacitor is discharged. DC-DC converters are employed at present to convert the voltage of the ultracapacitor to constant voltage; however these converters typically do not operate if the voltage of the ultracapacitor drops below 1?V. In addition DC-DC converters suffer from well-known size/efficiency tradeoffs. This paper introduces a novel new ultracapacitor that is characterized by constant voltage. The new ultracapacitor does not utilize familiar energy conversion principles. Rather operation depends on an embedded electromechanical system that actually alters the capacitance of the ultracapacitor as the device is discharged. Due to a simple proportionality relationship between charge capacitance and voltage the voltage remains constant. Theoretical and experimental investigations have shown that the embedded mechanism for altering the capacitance has an efficiency of 99% or higher.

Ezzat G. Bakhoum

2012-01-01T23:59:59.000Z

36

Voltage balanced multilevel voltage source converter system  

DOE Patents (OSTI)

A voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter. The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means.

Peng, Fang Zheng (Oak Ridge, TN); Lai, Jih-Sheng (Knoxville, TN)

1997-01-01T23:59:59.000Z

37

Voltage balanced multilevel voltage source converter system  

DOE Patents (OSTI)

Disclosed is a voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter. The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means. 15 figs.

Peng, F.Z.; Lai, J.S.

1997-07-01T23:59:59.000Z

38

Substation voltage upgrading  

SciTech Connect

Substation voltage uprating, i.e., conversion of a substation from a lower rated voltage to a higher rated voltage without a complete substation rebuild, can lead to excellent economic benefits. Utilization of the old substation layout and/or the existing equipment, to some extent, is the practical objective of such an uprating. The objective of this project was to assess the opportunities for substation uprating in the industry, to establish feasibility for such uprating and to study methods for accomplishing it. The final aim of the project was to provide guidance to utilities interested in uprating. 56 refs., 41 figs., 18 tabs.

Panek, J.; Elahi, H.; Sublich, M. (General Electric Co., Schenectady, NY (USA). Systems Development and Engineering Dept.)

1989-08-01T23:59:59.000Z

39

High voltage DC power supply  

DOE Patents (OSTI)

A high voltage DC power supply having a first series resistor at the output for limiting current in the event of a short-circuited output, a second series resistor for sensing the magnitude of output current, and a voltage divider circuit for providing a source of feedback voltage for use in voltage regulation is disclosed. The voltage divider circuit is coupled to the second series resistor so as to compensate the feedback voltage for a voltage drop across the first series resistor. The power supply also includes a pulse-width modulated control circuit, having dual clock signals, which is responsive to both the feedback voltage and a command voltage, and also includes voltage and current measuring circuits responsive to the feedback voltage and the voltage developed across the second series resistor respectively. 7 figs.

Droege, T.F.

1989-12-19T23:59:59.000Z

40

High voltage DC power supply  

DOE Patents (OSTI)

A high voltage DC power supply having a first series resistor at the output for limiting current in the event of a short-circuited output, a second series resistor for sensing the magnitude of output current, and a voltage divider circuit for providing a source of feedback voltage for use in voltage regulation is disclosed. The voltage divider circuit is coupled to the second series resistor so as to compensate the feedback voltage for a voltage drop across the first series resistor. The power supply also includes a pulse-width modulated control circuit, having dual clock signals, which is responsive to both the feedback voltage and a command voltage, and also includes voltage and current measuring circuits responsive to the feedback voltage and the voltage developed across the second series resistor respectively.

Droege, Thomas F. (Batavia, IL)

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Neutralization Efficiency Is Greatly Enhanced by Bivalent Binding of an Antibody to Epitopes in the V4 Region and the Membrane-Proximal External Region within One Trimer of Human Immunodeficiency Virus Type 1 Glycoproteins  

Science Journals Connector (OSTI)

...External Region within One Trimer of Human Immunodeficiency Virus Type 1 Glycoproteins Published ahead of print on 12 May 2010. Pengcheng Wang Present address: Department of Microbiology and Immunology, Medical College of Jinan University, Guangzhou, Guangdong...

Pengcheng Wang; Xinzhen Yang

2010-05-12T23:59:59.000Z

42

Distribution Patterns of Metals Contamination in Sediments Based on Type Regional Development on the Intertidal Coastal Zones of the Persian Gulf, Iran  

Science Journals Connector (OSTI)

This study was performed to determine the variation of metals concentrations (Pb, Cd, Zn, and Cu) in surface sediments based on type region development from ten sites on the intertidal coastal zone of the Persian

Ali Kazemi; Alireza Riyahi Bakhtiari…

2012-01-01T23:59:59.000Z

43

Voltage controlled current source  

DOE Patents (OSTI)

A seven decade, voltage controlled current source is described for use in testing intermediate range nuclear instruments that covers the entire test current range of from 10 picoamperes to 100 microamperes. High accuracy is obtained throughout the entire seven decades of output current with circuitry that includes a coordinated switching scheme responsive to the input signal from a hybrid computer to control the input voltage to an antilog amplifier, and to selectively connect a resistance to the antilog amplifier output to provide a continuous output current source as a function of a preset range of input voltage. An operator controlled switch provides current adjustment for operation in either a real-time simulation test mode or a time response test mode.

Casne, Gregory M. (Pittsburgh, PA)

1992-01-01T23:59:59.000Z

44

High-voltage engineering  

E-Print Network (OSTI)

High-voltage engineering covers the application, the useful use and proper working of high voltages and high fields. Here we give some introductory examples, i.e., ‘septa’ and ‘kicker’ at the Large Hadron Collider (14 TeV), the Super Proton Synchrotron (450 GeV) and the Proton Synchrotron (26 GeV) accelerators as found at the European Orginization for Nuclear Research (CERN) today. We briefly cover the theoretical foundation (Maxwell equations) and aspects of numerical field simulation methods. Concepts relating to electrical fields, insulation geometry and medium and breakdown are introduced. We discuss ways of generating high voltages with examples of AC sources (50/60 Hz), DC sources, and pulse sources. Insulation and breakdown in gases, liquids, solids and vacuum are presented, including Paschen’s law (breakdown field and streamer breakdown). Applications of the above are discussed, in particular the general application of a transformer. We briefly discuss measurement techniques of partial disch...

Gaxiola, E

2006-01-01T23:59:59.000Z

45

Introduction Potato Types and Uses The potato is native to the Andean region of South Potato varieties vary according to shape, flesh color  

E-Print Network (OSTI)

Introduction Potato Types and Uses The potato is native to the Andean region of South Potato, tuber type similar to the following examples: potatoes are the fourth most important food crop are planted each year for commercial production. The LongIWhite Skin: White Rose, Shepody potato is a member

Douches, David S.

46

High voltage pulse conditioning  

DOE Patents (OSTI)

Apparatus for conditioning high voltage pulses from particle accelerators in order to shorten the rise times of the pulses. Flashover switches in the cathode stalk of the transmission line hold off conduction for a determinable period of time, reflecting the early portion of the pulses. Diodes upstream of the switches divert energy into the magnetic and electrostatic storage of the capacitance and inductance inherent to the transmission line until the switches close.

Springfield, Ray M. (Sante Fe, NM); Wheat, Jr., Robert M. (Los Alamos, NM)

1990-01-01T23:59:59.000Z

47

Charge-pump voltage converter  

DOE Patents (OSTI)

A charge-pump voltage converter for converting a low voltage provided by a low-voltage source to a higher voltage. Charge is inductively generated on a transfer rotor electrode during its transit past an inductor stator electrode and subsequently transferred by the rotating rotor to a collector stator electrode for storage or use. Repetition of the charge transfer process leads to a build-up of voltage on a charge-receiving device. Connection of multiple charge-pump voltage converters in series can generate higher voltages, and connection of multiple charge-pump voltage converters in parallel can generate higher currents. Microelectromechanical (MEMS) embodiments of this invention provide a small and compact high-voltage (several hundred V) voltage source starting with a few-V initial voltage source. The microscale size of many embodiments of this invention make it ideally suited for MEMS- and other micro-applications where integration of the voltage or charge source in a small package is highly desirable.

Brainard, John P. (Albuquerque, NM); Christenson, Todd R. (Albuquerque, NM)

2009-11-03T23:59:59.000Z

48

Ignition distributor voltage generator  

SciTech Connect

This patent describes a voltage pulse generator and ignition distributor comprising, a base, a shaft rotatably supported by the base, a distributor cap supported by the base having a center electrode and circumferentially spaced outer electrodes. The pulse generator and ignition distribution also include a first rotor driven by the shaft formed of electrical insulating material having electrically conductive means connected to the center terminal and a portion that rotates past the outer electrodes. The portion of the electrically conductive means that rotates past the outer electrodes is spaced from the outer electrodes to form a gap therebetween. A voltage pulse generator comprises a second rotor driven by the shaft, at least one permanent magnet and an annular pickup coil supported by the base. The pickup coil has inner turns and outer turns, the beginning turn of the inner turns connected to a first lead and the last turn of the outer turns connected to a second lead, the outer turns enclosing the inner turns. The pickup coil also has a circuit connected directly between the second lead and ground which is operative to provide a direct conductive path to ground for high frequency energy capacitively coupled to the outer turns from the gap discharge between the electrically conductive means of the first rotor and an outer electrode, the outer turns forming a grounded shield for the inner turns.

Boyer, J.A.

1986-11-04T23:59:59.000Z

49

High voltage electric substation performance in earthquakes  

SciTech Connect

This paper examines the performance of several types of high voltage substation equipment in past earthquakes. Damage data is provided in chart form. This data is then developed into a tool for estimating the performance of a substation subjected to an earthquake. First, suggests are made about the development of equipment class fragility curves that represent the expected earthquake performance of different voltages and types of equipment. Second, suggestions are made about how damage to individual pieces of equipment at a substation likely affects the post-earthquake performance of the substation as a whole. Finally, estimates are provided as to how quickly a substation, at various levels of damage, can be restored to operational service after the earthquake.

Eidinger, J. [G and E Engineering Systems, Oakland, CA (United States); Ostrom, D. [Southern California Edison, Rosemead, CA (United States); Matsuda, E. [Pacific Gas and Electric, San Francisco, CA (United States)

1995-12-31T23:59:59.000Z

50

Planning of distribution networks for medium voltage and low voltage.  

E-Print Network (OSTI)

??Determination of the placement and rating of transformers and feeders are the main objective of the basic distribution network planning. The bus voltage and the… (more)

Ziari, Iman

2011-01-01T23:59:59.000Z

51

Substation voltage upgrading  

SciTech Connect

This report addresses specific issues to support sound yet not unduly conservative uprating practices for substations. The main parts of the report cover the insulation withstand and overvoltage protection aspects, environmental measurements, reliability criteria, and industry experience. First the insulation design concerns are addressed. Substation stress by a backflashover of the line insulation due to lightning in the vicinity of the substation is recognized as a critical stress. A representative part of a 550 kV BIL substation was erected at the EPRI High Voltage Transmission Research Center, where also a special test circuit was assembled to produce a fast front, slow tail (0.2/200 {mu}s) wave. The substation as well as some special configurations were tested for line-to-ground and line-to-line withstand. Computer studies were performed to complement the test results. A number of important conclusions was reached. The most prominent result in that the high frequency oscillations, as caused by reflections within the substation, do not effect the Critical Flashover Voltage (CFO). The present practice, based on the highest peak is therefore very conservative. The slow tail of the wave appears to dictate the CFO. An arrester model for computer studies to represent very fast as well as slow phenomena was derived. It is based on full scale arrester test data, made available in this project. The computer program to calculate arrester model parameters is also a part of the report. The electric environmental measurements are reported for the tested substation at the HVTRC and for the uprated substation of Public Service Company of Colorado, both before and after the uprating. The performance is satisfactory when corona free hardware is used. Insulation design criteria are analyzed based on substation reliability, the system viewpoint and consequences of the failure. Utility experience with uprated substations is reviewed.

Panek, J.; Elahi, H.; Lux, A.; Imece, A.F. (General Electric Co., Schenectady, NY (United States). Power Systems Engineering Dept.); LaPanse, R.A.; Stewart, J.R. (Public Service Co. of Colorado, Denver, CO (United States))

1992-04-01T23:59:59.000Z

52

E-beam high voltage switching power supply  

DOE Patents (OSTI)

A high-power power supply produces a controllable, constant high voltage put under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1996-01-01T23:59:59.000Z

53

E-beam high voltage switching power supply  

DOE Patents (OSTI)

A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules. 5 figs.

Shimer, D.W.; Lange, A.C.

1996-10-15T23:59:59.000Z

54

High voltage dc--dc converter with dynamic voltage regulation and decoupling during load-generated arcs  

DOE Patents (OSTI)

A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules. 5 Figs.

Shimer, D.W.; Lange, A.C.

1995-05-23T23:59:59.000Z

55

High voltage dc-dc converter with dynamic voltage regulation and decoupling during load-generated arcs  

DOE Patents (OSTI)

A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1995-01-01T23:59:59.000Z

56

Sacramento Area Voltage Support Environmental Impact Statement  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

E E R R A N E V A D A R E G I O N Sacramento Area Voltage Support DRAFT ENVIRONMENTAL IMPACT STATEMENT DRAFT ENVIRONMENTAL IMPACT STATEMENT DOE/EIS-0323 NOVEMBER 2002 COVER SHEET Title: Sacramento Area Voltage Support Draft Environmental Impact Statement (EIS) Lead Agency: Western Area Power Administration (Western) Location: Alameda, Contra Costa, Placer, Sacramento, San Joaquin, and Sutter Counties, State of California. EIS Number: DOE/EIS-0323 Contact: Ms. Loreen McMahon, Environmental Project Manager Western Area Power Administration Sierra Nevada Region 114 Parkshore Drive Folsom, CA 95630 (916) 353-4460 (916) 985-1936 fax email: mcmahon@wapa.gov Website: Information is also available on our website: www.wapa.gov Hotline: 1-877-913-4440 (toll-free) Abstract The Western Area Power Administration's Central Valley Project transmission system forms an integral part of

57

ABBGroup-1-High voltage lab  

E-Print Network (OSTI)

;©ABBGroup-3- 3-Sep-07 Where does one use circuit breakers? High voltage (HV) circuit breakers are keyA DISTRIBUTION MEDIUM AND LOW VOLTAGE HV circuit breakers #12;©ABBGroup-4- 3-Sep-07 When a breaker fails to interrupt the current... Fault arc at a disconnector Fault arc in a substation #12;©ABBGroup-5- 3-Sep-07

Basse, Nils Plesner

58

Temperature controlled high voltage regulator  

DOE Patents (OSTI)

A temperature controlled high voltage regulator for automatically adjusting the high voltage applied to a radiation detector is described. The regulator is a solid state device that is independent of the attached radiation detector, enabling the regulator to be used by various models of radiation detectors, such as gas flow proportional radiation detectors.

Chiaro, Jr., Peter J. (Clinton, TN); Schulze, Gerald K. (Knoxville, TN)

2004-04-20T23:59:59.000Z

59

Tissue site-specific enhancer function of the upstream regulatory region of human papillomavirus type 11 in cultured keratinocytes.  

Science Journals Connector (OSTI)

...in cultured cells after microinjection with DNA constructsa T-antigen expression with constructs: Cell type No. of pPT-1 pPPl pPT-11R % Positive Intensityb % Positive Intensity % Positive Intensity Host Larynx 3 4.7 ? 3.1 NDc 44.0 ? 22.1 30...

B M Steinberg; K J Auborn; J L Brandsma; L B Taichman

1989-02-01T23:59:59.000Z

60

Low voltage nonprimary explosive detonator  

DOE Patents (OSTI)

A low voltage, electrically actuated, nonprimary explosive detonator is disclosed wherein said detonation is achieved by means of an explosive train in which a deflagration-to-detonation transition is made to occur. The explosive train is confined within a cylindrical body and positioned adjacent to low voltage ignition means have electrical leads extending outwardly from the cylindrical confining body. Application of a low voltage current to the electrical leads ignites a self-sustained deflagration in a donor portion of the explosive train which then is made to undergo a transition to detonation further down the train.

Dinegar, Robert H. (Los Alamos, NM); Kirkham, John (Newbury, GB2)

1982-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Definition: Automated Voltage Regulators | Open Energy Information  

Open Energy Info (EERE)

Regulators Regulators Jump to: navigation, search Dictionary.png Automated Voltage Regulators Voltage regulators are transformers that can increase or decrease the voltage on a distribution circuit to help keep the voltage within a pre-determined band. Unlike capacitor banks, voltage regulators cannot adjust power factor. These devices typically monitor the voltage at the location where they are connected, and compare it to a programmed set point. If the voltage deviates too far from the set point, the voltage regulator can increase or decrease its output voltage by moving the tap on the secondary side up or down. An automated voltage regulator can operate with remote control signals, or in concert with other area voltage control devices, to help regulate distribution voltage in a coordinated fashion.

62

Saving Megawatts with Voltage Optimization  

E-Print Network (OSTI)

that had been installed at several electric utility distribution substations in the U.S. and Canada. These systems, being operated in Conservation Voltage Regulation mode, have provided significant energy conservation where they have been installed...

Wilson, T.; Bell, D.

2010-01-01T23:59:59.000Z

63

Electro-optic voltage sensor head  

DOE Patents (OSTI)

The invention is an electro-optic voltage sensor head designed for integration with existing types of high voltage transmission and distribution apparatus. The sensor head contains a transducer, which comprises a transducing material in which the Pockels electro-optic effect is observed. In the practice of the invention at least one beam of electromagnetic radiation is routed into the transducing material of the transducer in the sensor head. The beam undergoes an electro-optic effect in the sensor head when the transducing material is subjected to an E-field. The electro-optic effect is observed as a differential phase a shift, also called differential phase modulation, of the beam components in orthogonal planes of the electromagnetic radiation. In the preferred embodiment the beam is routed through the transducer along an initial axis and then reflected by a retro-reflector back substantially parallel to the initial axis, making a double pass through the transducer for increased measurement sensitivity. The preferred embodiment of the sensor head also includes a polarization state rotator and at least one beam splitter for orienting the beam along major and minor axes and for splitting the beam components into two signals which are independent converse amplitude-modulated signals carrying E-field magnitude and hence voltage information from the sensor head by way of optic fibers.

Crawford, Thomas M. (Idaho Falls, ID); Davidson, James R. (Idaho Falls, ID); Woods, Gregory K. (Cornelius, OR)

1999-01-01T23:59:59.000Z

64

High voltage stability performance of a gamma ray detection device  

SciTech Connect

An industrial grade digital radiation survey meter device is currently being developed at Malaysian Nuclear Agency. This device used a cylindrical type Geiger Mueller (GM) which acts as a detector. GM detector operates at relatively high direct current voltages depend on the type of GM tube. This thin/thick walled cylindrical type of GM tube operates at 450-650 volts range. Proper value and stability performance of high voltage are important parameters to ensure that this device give a reliable radiation dose measurement. This paper will present an assessment of the stability and performance of the high voltage supply for radiation detector. The assessment is performed using System Identification tools box in MATLAB and mathematical statistics.

Abdullah, Nor Arymaswati; Lombigit, Lojius; Rahman, Nur Aira Abd [Technical Support Division, Malaysian Nuclear Agency, 43000 Kajang, Selangor (Malaysia)

2014-02-12T23:59:59.000Z

65

High-voltage air-core pulse transformers  

SciTech Connect

General types of air core pulse transformers designed for high voltage pulse generation and energy transfer applications are discussed with special emphasis on pulse charging systems which operate up to the multi-megavolt range. The design, operation, dielectric materials, and performance are described. It is concluded that high voltage air core pulse transformers are best suited to applications outside the normal ranges of conventional magnetic core transformers. In general these include charge transfer at high power levels and fast pulse generation with comparatively low energy. When properly designed and constructed, they are capable of delivering high energy transfer efficiency and have demonstrated superior high voltage endurance. The principal disadvantage of high voltage air core transformers is that they are not generally available from commercial sources. Consequently, the potential user must become thoroughly familiar with all aspects of design, fabrication and system application before he can produce a high performance transformer system. (LCL)

Rohwein, G. J.

1981-01-01T23:59:59.000Z

66

Voltage, energy and power in electric circuits  

E-Print Network (OSTI)

Voltage, energy and power in electric circuits Science teaching unit #12;Disclaimer The Department-2008DVD-EN Voltage, energy and power in electric circuits #12;#12;© Crown copyright 2008 1The National Strategies | Secondary Voltage, energy and power in electric circuits 00094-2008DVD-EN Contents Voltage

Berzins, M.

67

The Application of Droop-Control in Distributed Energy Resources to Extend the Voltage Collapse Margin  

SciTech Connect

The growth in distributed energy resources has the potential to reduce system stresses caused by transmission grid congestion by supplying power and voltage regulation closer to load centers. However, the additional voltage regulation provided by these resources can mask the onset of voltage collapse. Local voltage support flattens the slope in the upper region of the power-voltage nose curve. Coordinating voltage-regulation behavior with the droop-control scheme in distributed resources improves the observation of voltage collapse margins. Incorporating distributed resource models in the continuation power flow analysis, allows the exploration of the power transfer gains by the application of distributed resources. The analysis provides insight to the impact of droop control on the behavior of the power-voltage curve and voltage collapse. The analysis is applied to a fixed speed induction generator wind farm with separate reactive compensation and the interconnection to the local power system. Results reveal that coordinating the droop control strategy allows the distributed resource to significantly increase the voltage collapse margin without hiding the threat of voltage stability problems.

Henry, Shawn D. [Florida State University; Rizy, D Tom [ORNL; Baldwin, Thomas L [Florida State University; Kueck, John D [ORNL; Li, Fangxing [ORNL

2008-01-01T23:59:59.000Z

68

The Onset of Voltage Hash and its Relationship to Anode Spots in Magnetoplasmadynamic Thrusters  

E-Print Network (OSTI)

The Onset of Voltage Hash and its Relationship to Anode Spots in Magnetoplasmadynamic Thrusters, 08544 A phenomenological model is developed to elucidate the relationship between voltage hash and anode electromagnetic force density leads to a mass depletion in the anode region which, in turn, leads to a disparity

Choueiri, Edgar

69

ABBGroup-1-High voltage lab  

E-Print Network (OSTI)

A DISTRIBUTION MEDIUM AND LOW VOLTAGE HV circuit breakers #12;©ABBGroup-4- 3-Sep-07 When a breaker fails to interrupt the current... Fault arc at a disconnector Fault arc in a substation #12;©ABBGroup-5- 3-Sep-07/costs A detailed understanding of arc physics and fluid dynamics is necessary for the development of HV circuit

Basse, Nils Plesner

70

Current vs. Voltage Feedback Amplifiers  

E-Print Network (OSTI)

?' In most applications, the differences between current feedback (CFB) and voltage feedback (VFB) are not apparent. Today's CFB and VFB amplifiers have comparable performance, but there are cer- tain unique Performance · Feedback Freedom Aside from the well-known attribute of CFB amplifiers, gain

Lanterman, Aaron

71

Modulated voltage metastable ionization detector  

SciTech Connect

Metastable ionization detectors used for chromatographic analysis usually employa fixed high voltage for the ionization potential. For this reason, the operating range is limited to about three orders of magnitude. By use of the technique disclosed in the instant invention, operating ranges of about nine orders of magnitude are obtained. The output current from a metastable ionization detector (MID) is applied to a modulation voltage circuit. An adjustment is made to balance out the background current, and an output current, above background, is applied to an input of a strip chart recorder. For low level concentrations, i.e., low detected output current, the ionization potential will be at a maximum and the metastable ionization detector will operate at its most sensitive level. When the detected current from the metastable ionization detector increases above a predetermined threshold level, a voltage control circuit is activated which turns on a high voltage transistor which acts to reduce the ionization potential. The ionization potential applied to the metastable ionization detector is then varied so as to maintain the detected signal level constant. The variation in ionization potential is now related to the concentration fo the constituent and a representative amplitude is applied to another input of said strip chart recorder.

Carle, G. C.; Humphry, D. E.; Kojiro, D. R.

1985-08-27T23:59:59.000Z

72

Analysis on DFIG Wind Power System Low-Voltage Ridethrough  

Science Journals Connector (OSTI)

Due to the double fed induction generator’s (DFIG) advantage of controlling active and reactive power independently and partial power converter, DFIG is becoming a popular type of wind power generation system. Nowadays, the grid code demands that ... Keywords: VSCF, DFIG, LVRT, Crowbar, Voltage sags

Yulong Wang; Jianlin Li; Shuju Hu; Honghua Xu

2009-04-01T23:59:59.000Z

73

High Voltage DC Transmission 2 1.0 Introduction  

E-Print Network (OSTI)

1 High Voltage DC Transmission 2 1.0 Introduction Interconnecting HVDC within an AC system requires on use of switching devices collectively referred to in the HVDC community as valves. Valves may be non. Fig. 1 There have been three types of devices for implementing HVDC converter circuits: mercury

McCalley, James D.

74

Self-Excited ac High Voltage Generation Using Water Droplets  

Science Journals Connector (OSTI)

By letting water drops fall through rings into cans high voltage can be spontaneously generated with no external electrical excitation. Previous work concerning this type of electric influence machine for dc and three-phase ac high voltage generation is extended to include multiphase multifrequency operation by considering N streams and N cans. A distributed equivalent circuit representation is used to calculate the natural frequencies of the system where it is found that many overstable modes are present. Experimental observations with up to five cans are presented. This device can serve as a model for phenomena concerned with atmospheric electricity.

Markus Zahn

1973-01-01T23:59:59.000Z

75

Spark-safe low-voltage detonator  

DOE Patents (OSTI)

A column of explosive in a low-voltage detonator which makes it spark-safe ncludes an organic secondary explosive charge of HMX in the form of a thin pad disposed in a bore of a housing of the detonator in an ignition region of the explosive column and adjacent to an electrical ignition device at one end of the bore. The pad of secondary charge has an axial thickness within the range of twenty to thirty percent of its diameter. The explosive column also includes a first explosive charge of CP disposed in the housing bore in the ignition region of the explosive column next to the secondary charge pad on a side opposite from the ignition device. The first CP charge is loaded under sufficient pressure, 25 to 40 kpsi, to provide mechanical confinement of the pad of secondary charge and physical coupling thereof with the ignition device. The explosive column further includes a second explosive charge of CP disposed in the housing bore in a transition region of the explosive column next to the first CP charge on a side opposite from the pad of secondary charge. The second CP charge is loaded under sufficient pressure, about 10 kpsi, to allow occurrence of DDT. The first explosive CP charge has an axial thickness within the range of twenty to thirty percent of its diameter, whereas the second explosive CP charge contains a series of increments (nominally 4) each of which has an axial thickness-to-diameter ratio of one to two.

Lieberman, Morton L. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

76

Automatic Voltage Control of Electrical Systems  

Science Journals Connector (OSTI)

... to have complete automatic voltage regulation and it also has supervisory control for its main substations. By a careful application of automatically controlled regulators it is shown that the voltage ...

1934-01-20T23:59:59.000Z

77

Implications of Pulser Voltage Ripple  

SciTech Connect

In a recent set of measurements obtained by G. Kamin, W. Manning, A. Molvik, and J. Sullivan, the voltage waveform of the diode pulser had a ripple of approximately {+-}1.3% of the 65 kV flattop voltage, and the beam current had a larger corresponding ripple of approximately {+-}8.4% of the 1.5 mA average current at the location of the second Faraday cup, approximately 1.9 m downstream from the ion source. The period of the ripple was about 1 {mu}s. It was initially unclear whether this large current ripple was in fact a true measurement of the current or a spurious measurement of noise produced by the pulser electronics. The purpose of this note is to provide simulations which closely match the experimental results and thereby corroborate the physical nature of those measurements, and to provide predictions of the amplitude of the current ripples as they propagate to the end of linear transport section. Additionally analytic estimates are obtained which lend some insight into the nature of the current fluctuations and to provide an estimate of what the maximum amplitude of the current fluctuations are expected to be, and conversely what initial ripple in the voltage source is allowed, given a smaller acceptable tolerance on the line charge density.

Barnard, J J

2011-12-21T23:59:59.000Z

78

E-beam high voltage switching power supply  

DOE Patents (OSTI)

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360{degree}/n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load. 7 figs.

Shimer, D.W.; Lange, A.C.

1997-03-11T23:59:59.000Z

79

E-beam high voltage switching power supply  

DOE Patents (OSTI)

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360.degree./n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1997-01-01T23:59:59.000Z

80

Onset voltage of corona on coated conductors  

SciTech Connect

This paper is aimed for investigating the effect of surface coating on the positive and negative onset voltages of corona from stressed conductor as a pre-requisite for onset-voltage calculation. The electric field is accurately calculated by the charge simulation technique. The calculated onset voltages agreed satisfactorily with those measured experimentally for bare conductors. The effect of coating-layer thickness and permittivity as well as conductor radius and height on the onset-voltage values is discussed.

Abdel-Salam, M. [Assiut Univ. (Egypt). Electrical Engineering Dept.; Abo-Shal, Y. [SCECO-East, Dammam (Saudi Arabia). Electrical Engineering Div.

1995-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Improving the low voltage ride through of doubly fed induction generator during intermittent voltage source converter faults  

Science Journals Connector (OSTI)

The impact of different voltage source converter (VSC) faults on the low voltage ride through (LVRT) capability of the doubly fed induction generator (DFIG) is also investigated. Faults such as fire-through of the VSC switches and short circuit across the DC-link capacitor are considered in this paper. The impact of internal VSC faults when they occur within the grid side converter (GSC) and rotor side converter is investigated. A proper static synchronous compensator (STATCOM) controller to mitigate the effects of these faults is proposed. The DFIG compliance with numerous and recently released LVRT grid codes under these faults with and without the STATCOM is examined and compared. Simulation results indicate that these types of faults have a severe impact on the DFIG voltage profile especially when these faults occur in the GSC. This is attributed to the fact that the GSC directly regulates the point of common coupling (PCC) voltage. Moreover the proposed controller is capable of bringing the voltage profile at the PCC to the nominal steady state level and hence maintaining the connection of the wind turbine during the various studied faults.

H. R. Pota

2013-01-01T23:59:59.000Z

82

Monolithic high voltage nonlinear transmission line fabrication process  

DOE Patents (OSTI)

A process for fabricating sequential inductors and varistor diodes of a monolithic, high voltage, nonlinear, transmission line in GaAs is disclosed. An epitaxially grown laminate is produced by applying a low doped active n-type GaAs layer to an n-plus type GaAs substrate. A heavily doped p-type GaAs layer is applied to the active n-type layer and a heavily doped n-type GaAs layer is applied to the p-type layer. Ohmic contacts are applied to the heavily doped n-type layer where diodes are desired. Multiple layers are then either etched away or Oxygen ion implanted to isolate individual varistor diodes. An insulator is applied between the diodes and a conductive/inductive layer is thereafter applied on top of the insulator layer to complete the process. 6 figs.

Cooper, G.A.

1994-10-04T23:59:59.000Z

83

Monolithic high voltage nonlinear transmission line fabrication process  

DOE Patents (OSTI)

A process for fabricating sequential inductors and varactor diodes of a monolithic, high voltage, nonlinear, transmission line in GaAs is disclosed. An epitaxially grown laminate is produced by applying a low doped active n-type GaAs layer to an n-plus type GaAs substrate. A heavily doped p-type GaAs layer is applied to the active n-type layer and a heavily doped n-type GaAs layer is applied to the p-type layer. Ohmic contacts are applied to the heavily doped n-type layer where diodes are desired. Multiple layers are then either etched away or Oxygen ion implanted to isolate individual varactor diodes. An insulator is applied between the diodes and a conductive/inductive layer is thereafter applied on top of the insulator layer to complete the process.

Cooper, Gregory A. (346 Primrose Dr., Pleasant Hill, CA 94523)

1994-01-01T23:59:59.000Z

84

Radio-frequency powered glow discharge device and method with high voltage interface  

DOE Patents (OSTI)

A high voltage accelerating potential, which is supplied by a high voltage direct current power supply, is applied to the electrically conducting interior wall of an RF powered glow discharge cell. The RF power supply desirably is electrically grounded, and the conductor carrying the RF power to the sample held by the probe is desirably shielded completely excepting only the conductor's terminal point of contact with the sample. The high voltage DC accelerating potential is not supplied to the sample. A high voltage capacitance is electrically connected in series between the sample on the one hand and the RF power supply and an impedance matching network on the other hand. The high voltage capacitance isolates the high DC voltage from the RF electronics, while the RF potential is passed across the high voltage capacitance to the plasma. An inductor protects at least the RF power supply, and desirably the impedance matching network as well, from a short that might occur across the high voltage capacitance. The discharge cell and the probe which holds the sample are configured and disposed to prevent the probe's components, which are maintained at ground potential, from bridging between the relatively low vacuum region in communication with the glow discharge maintained within the cell on the one hand, and the relatively high vacuum region surrounding the probe and cell on the other hand. The probe and cell also are configured and disposed to prevent the probe's components from electrically shorting the cell's components. 11 figures.

Duckworth, D.C.; Marcus, R.K.; Donohue, D.L.; Lewis, T.A.

1994-06-28T23:59:59.000Z

85

High voltage RF feedthrough bushing  

DOE Patents (OSTI)

Described is a multi-element, high voltage radio frequency bushing for trmitting RF energy to an antenna located in a vacuum container. The bushing includes a center conductor of complex geometrical shape, an outer coaxial shield conductor, and a thin-walled hollow truncated cone insulator disposed between central and outer conductors. The shape of the center conductor, which includes a reverse curvature portion formed of a radially inwardly directed shoulder and a convex portion, controls the uniformity of the axial surface gradient on the insulator cone. The outer shield has a first substantially cylindrical portion and a second radially inwardly extending truncated cone portion.

Grotz, Glenn F. (Huntington Station, NY)

1984-01-01T23:59:59.000Z

86

Bonfire-safe low-voltage detonator  

DOE Patents (OSTI)

A column of explosive in a low-voltage detonator which makes it bonfire-safe includes a first layer of an explosive charge of CP, or a primary explosive, and a second layer of a secondary organic explosive charge, such as PETN, which has a degradation temperature lower than the autoignition temperature of the CP or primary explosives. The first layer is composed of a pair of increments disposed in a bore of a housing of the detonator in an ignition region of the explosive column and adjacent to and in contact with an electrical ignition device at one end of the bore. The second layer is composed of a plurality of increments disposed in the housing bore in a transition region of the explosive column next to and in contact with the first layer on a side opposite from the ignition device. The first layer is loaded under a sufficient high pressure, 25 to 40 kpsi, to achieve ignition, whereas the second layer is loaded under a sufficient low pressure, about 10 kpsi, to allow occurrence of DDT. Each increment of the first and second layers has an axial length-to-diameter ratio of one-half.

Lieberman, Morton L. (Albuquerque, NM)

1990-01-01T23:59:59.000Z

87

Definition: Operating Voltage | Open Energy Information  

Open Energy Info (EERE)

Voltage Voltage Jump to: navigation, search Dictionary.png Operating Voltage The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related; also, the effective (root-mean-square) potential difference between any two conductors or between a conductor and the ground. The actual voltage of the circuit may vary somewhat above or below this value.[1] Related Terms system References ↑ Glossary of Terms Used in Reliability Standards An LikeLike UnlikeLike You like this.Sign Up to see what your friends like. inline Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Operating_Voltage&oldid=480559" Categories: Definitions ISGAN Definitions What links here Related changes

88

Wind Power Plant Voltage Stability Evaluation: Preprint  

SciTech Connect

Voltage stability refers to the ability of a power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition. Voltage stability depends on a power system's ability to maintain and/or restore equilibrium between load demand and supply. Instability that may result occurs in the form of a progressive fall or rise of voltages of some buses. Possible outcomes of voltage instability are the loss of load in an area or tripped transmission lines and other elements by their protective systems, which may lead to cascading outages. The loss of synchronism of some generators may result from these outages or from operating conditions that violate a synchronous generator's field current limit, or in the case of variable speed wind turbine generator, the current limits of power switches. This paper investigates the impact of wind power plants on power system voltage stability by using synchrophasor measurements.

Muljadi, E.; Zhang, Y. C.

2014-09-01T23:59:59.000Z

89

High voltage load resistor array  

DOE Patents (OSTI)

A high voltage resistor comprising an array of a plurality of parallel electrically connected resistor elements each containing a resistive solution, attached at each end thereof to an end plate, and about the circumference of each of the end plates, a corona reduction ring. Each of the resistor elements comprises an insulating tube having an electrode inserted into each end thereof and held in position by one or more hose clamps about the outer periphery of the insulating tube. According to a preferred embodiment, the electrode is fabricated from stainless steel and has a mushroom shape at one end, that inserted into the tube, and a flat end for engagement with the end plates that provides connection of the resistor array and with a load.

Lehmann, Monty Ray (Smithfield, VA)

2005-01-18T23:59:59.000Z

90

Group 3: Humidity, Temperature, and Voltage (Presentation)  

SciTech Connect

Group 3 is chartered to develop accelerated stress tests that can be used as comparative predictors of module lifetime versus stresses associated with humidity, temperature and voltage.

Wohlgemuth, J.

2013-05-01T23:59:59.000Z

91

High Voltage Electrolyte for Lithium Batteries  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

battery using high voltage high energy cathode materials to enable large-scale, cost competitive production of the next generation of electric-drive vehicles. To...

92

Application of evolutionary algorithms for the planning of urban distribution networks of medium voltage  

E-Print Network (OSTI)

Abstract—Currently, an important issue in power distribution is the need to optimize medium voltage (mv) networks serving urban areas. This paper shows how an evolutionary algorithm can be used as the basis for the type of efficient algorithm such optimization demands. The search for optimal network solution will be restricted to a graph defined from the urban map, so each graph branch represents a trench. The solution space (networks) is assumed with “loop feeder circuits”: networks with two electrical paths from the high voltage/medium voltage (hv/mv) substations to the customers. In the optimization process, the investment and loss load costs are considered taking into account the constraints of conductor capacities and voltage drop. The investment costs will take into account that some cables can be lying in the same trench. The process was applied for a Spanish city of 200 000 inhabitants. Index Terms—Evolutionary algorithm, medium voltage network planning, network design, urban distribution network. I.

unknown authors

2002-01-01T23:59:59.000Z

93

Cermet insert high voltage holdoff improvement for ceramic/metal vacuum devices  

DOE Patents (OSTI)

An improved metal-to-ceramic seal is provided wherein the ceramic body of the seal contains an integral region of cermet material in electrical contact with the metallic member, e.g., an electrode, of the seal. The seal is useful in high voltage vacuum devices, e.g., vacuum switches, and increases the high-voltage holdoff capabilities of such devices. A method of fabricating such seals is also provided.

Ierna, W.F.

1986-03-11T23:59:59.000Z

94

DESIGN AND IMPLEMENTATION OF A FUZZY LOGIC-BASED VOLTAGE CONTROLLER FOR VOLTAGE REGULATION  

E-Print Network (OSTI)

1 DESIGN AND IMPLEMENTATION OF A FUZZY LOGIC-BASED VOLTAGE CONTROLLER FOR VOLTAGE REGULATION In this paper the design and implementation of a fuzzy logic-based controller is described for regulating the output voltage of a synchronous generator. An automated fuzzy logic-based control strategy is presented

LaMeres, Brock J.

95

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a Linear Induction Accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance.

Parsons, William M. (Santa Fe, NM)

1992-01-01T23:59:59.000Z

96

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a linear induction accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core is disclosed. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance. 4 figs.

Parsons, W.M.

1992-12-29T23:59:59.000Z

97

Limitations of High-Voltage Insulation  

Science Journals Connector (OSTI)

... materials such as impregnated paper. The important electrical properties of the materials used for the insulation of high-voltage circuits are conductivity and electric strength. The conductivity measures the ability ... a million times between themselves, but they are all classified as available for high-voltage insulation.

1938-01-08T23:59:59.000Z

98

NREL: Measurements and Characterization - Current Versus Voltage  

NLE Websites -- All DOE Office Websites (Extended Search)

Current Versus Voltage Current Versus Voltage The National Renewable Energy Laboratory (NREL) Device Performance group uses current versus voltage (I-V) measurement systems to assess the main performance parameters for photovoltaic (PV) cells and modules. I-V measurement systems determine the output performance of devices, including: open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF), maximum power output of the device (Pmax), voltage at maximum power (Vmax), current at maximum power (Imax), and conversion efficiency of the device (η). Some I-V systems may also be used to perform dark I-V measurements to determine diode properties and series and shunt resistances. We use three I-V systems to measure performance of individual PV cells; and four for modules - two for measurements under simulated conditions; and

99

Non-contact current and voltage sensor  

DOE Patents (OSTI)

A detachable current and voltage sensor provides an isolated and convenient device to measure current passing through a conductor such as an AC branch circuit wire, as well as providing an indication of an electrostatic potential on the wire, which can be used to indicate the phase of the voltage on the wire, and optionally a magnitude of the voltage. The device includes a housing that contains the current and voltage sensors, which may be a ferrite cylinder with a hall effect sensor disposed in a gap along the circumference to measure current, or alternative a winding provided through the cylinder along its axis and a capacitive plate or wire disposed adjacent to, or within, the ferrite cylinder to provide the indication of the voltage.

Carpenter, Gary D; El-Essawy, Wael; Ferreira, Alexandre Peixoto; Keller, Thomas Walter; Rubio, Juan C; Schappert, Michael A

2014-03-25T23:59:59.000Z

100

Electro-optical voltage sensor head  

DOE Patents (OSTI)

A miniature electro-optic voltage sensor system capable of accurate operation at high voltages. The system employs a transmitter, a sensor disposed adjacent to but out of direct electrical contact with a conductor on which the voltage is to be measured, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor where the beam undergoes the Pockels electro-optic effect. The electro-optic effect causes phase shifting in the beam, which is in turn converted to a pair of independent beams, from which the voltage of a system based on its E-field is determined when the two beams are normalized by the signal processor. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse whose ellipticity varies between -1 and +1 in proportion to voltage) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Idaho Falls, ID)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Voltage Dependent Carrier Collection in CdTe Solar Cells D.L. Btzner1  

E-Print Network (OSTI)

Voltage Dependent Carrier Collection in CdTe Solar Cells D.L. Bätzner1 , Guido Agostinelli2 , A to 1000nm, i.e. the band edge region of CdTe. Region I is further divided in a `blue' part between 300 nm III is as well subdivided in region IIIa from about 800 nm to the band gap of CdTe (~850 nm

Romeo, Alessandro

102

Through Voluntary Conservation Regional Step-Down Plan  

E-Print Network (OSTI)

II. Regional Overview..................................................................................................................... 3 Wetland Habitat Types............................................................................................................... 3 Coastal Upland Habitat Types................................................................................................... 4

unknown authors

103

Researchers map atomic movements that trigger voltage fade in...  

NLE Websites -- All DOE Office Websites (Extended Search)

map atomic movements that trigger voltage fade in high-energy-density batteries January 22, 2015 Voltage and capacity curves from an LMR-NMC high-energy cathode show voltage fade...

104

Low voltage arc formation in railguns  

DOE Patents (OSTI)

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile.

Hawke, R.S.

1985-08-05T23:59:59.000Z

105

Low voltage arc formation in railguns  

DOE Patents (OSTI)

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile. 2 figs.

Hawke, R.S.

1987-11-17T23:59:59.000Z

106

Low voltage arc formation in railguns  

DOE Patents (OSTI)

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile.

Hawke, Ronald S. (Livermore, CA)

1987-01-01T23:59:59.000Z

107

Modular high voltage power supply for chemical analysis  

DOE Patents (OSTI)

A high voltage power supply for use in a system such as a microfluidics system, uses a DC-DC converter in parallel with a voltage-controlled resistor. A feedback circuit provides a control signal for the DC-DC converter and voltage-controlled resistor so as to regulate the output voltage of the high voltage power supply, as well as, to sink or source current from the high voltage supply.

Stamps, James F. (Livermore, CA); Yee, Daniel D. (Dublin, CA)

2010-05-04T23:59:59.000Z

108

Constant voltage electro-slag remelting control  

DOE Patents (OSTI)

A system for controlling electrode gap in an electro-slag remelt furnace has a constant regulated voltage and an electrode which is fed into the slag pool at a constant rate. The impedance of the circuit through the slag pool is directly proportional to the gap distance. Because of the constant voltage, the system current changes are inversely proportional to changes in gap. This negative feedback causes the gap to remain stable. 1 fig.

Schlienger, M.E.

1996-10-22T23:59:59.000Z

109

Vehicle Technologies Office Merit Review 2014: High-Voltage Solid...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High-Voltage Solid Polymer Batteries for Electric Drive Vehicles Vehicle Technologies Office Merit Review 2014: High-Voltage Solid Polymer Batteries for Electric Drive Vehicles...

110

High-Voltage Solid Polymer Batteries for Electric Drive Vehicles...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High-Voltage Solid Polymer Batteries for Electric Drive Vehicles High-Voltage Solid Polymer Batteries for Electric Drive Vehicles 2013 DOE Hydrogen and Fuel Cells Program and...

111

High-Voltage Solid Polymer Batteries for Electric Drive Vehicles...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

High-Voltage Solid Polymer Batteries for Electric Drive Vehicles High-Voltage Solid Polymer Batteries for Electric Drive Vehicles 2012 DOE Hydrogen and Fuel Cells Program and...

112

Cathode Synthesis and Voltage Fade: Designed Solutions Based...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cathode Synthesis and Voltage Fade: Designed Solutions Based on Theory Cathode Synthesis and Voltage Fade: Designed Solutions Based on Theory 2013 DOE Hydrogen and Fuel Cells...

113

Optimal Voltage Control of the Southern Norwegian Power Grid.  

E-Print Network (OSTI)

??This thesis contains the synthesis, analysis and simulation results of an automatic optimal voltage controller for the Southern Norwegian power grid. Currently the high voltage… (more)

Hannisdal, Erik Lundegaard

2011-01-01T23:59:59.000Z

114

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials 2013 DOE...

115

High voltage overhead long transmission line design and fault analysis.  

E-Print Network (OSTI)

??The goal of this project is to design a reliable high voltage overhead long transmission line that satisfies specific design criteria including voltage regulation, efficiency,… (more)

Elzain, Mohamed Ali

2011-01-01T23:59:59.000Z

116

Voltage sensor with fiber Fabry-Perot interferometer  

E-Print Network (OSTI)

with smaller strain constants, a larger voltage must be applied to get a 2x round trip phase shift. Hence, a longer FFPI is needed to get higher resolution. 16 A plate type PZT was selected because it's more convenient to attach to a thermo-electric cooler... in electron-beam evaporation system, they can be spliced to uncoated fibers, which also have cleaved end surfaces. The basic configuration for this Siecor Model M 67 fusion splicer is shown in fig. 12. A electric arc is initiated between the electrodes...

Wann, Been-Huey

1992-01-01T23:59:59.000Z

117

Sacramento Area Voltage Support Driaft Supplement Environmental Impact Statement and Environmental Impact Report  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Sacramento Area Voltage Support Draft SEIS/EIR * Western Area Power Administration * Sierra Nevada Region Sacramento Area Voltage Support Draft SEIS/EIR * Western Area Power Administration * Sierra Nevada Region A-1 APPEN DIX A Alternatives Development A.1 INTRODUCTION Appendix A summarizes the process used to identify and screen project alternatives for the joint, draft Supplemental Environmental Impact Statement and Environmental Impact Report (Sacramento Area Voltage Support (SVS) Draft SEIS and EIR). Public involvement was used to develop and refine alternatives. Engineering considerations were the primary factor in eliminating several alternatives. A.2 ALTERNATIVES SELECTED FOR DETAILED ANALYSIS Western Area Power Administration (Western), Sacramento Municipal Utility District (SMUD), and the City of Roseville (Roseville) identified three transmission line segments between Western's

118

Hedge-algebra-based voltage controller for a self-excited induction generator  

Science Journals Connector (OSTI)

Abstract This paper presents an indirect rotor-flux-oriented (IRFO) control system of the self-excited induction generator (SEIG) in which excitation is achieved by means of a current-controlled voltage source inverter (CC-VSI) and a single electrolytic capacitor. In the proposed control scheme, both the iron losses and the magnetic saturation are taken into account and calculated online. The main objective is to keep the DC voltage across the capacitor constant and equal to the reference value, regardless of changes in the rotor speed and load. The study is mainly focused on the DC voltage control and, more specifically, on selection of the appropriate DC voltage controller. Besides considering widely accepted types of controllers, i.e., the classical PI controller and the fuzzy logic (FL) controller, this paper proposes an alternative solution – a new type of DC voltage controller based on hedge algebra. To our best knowledge, this is the first time that such a controller is considered for application in electrical engineering. The performance of the developed hedge algebra (HA) controller is evaluated through comparison with the optimal-tuned classical PI controller and the Sugeno-type FL controller. The simulation and experimental analysis are carried out in reasonably wide ranges of the DC voltage, load and rotor speed, including the case of a variable rotor speed. It is shown that the proposed HA controller provides superior performance in terms of tracking the reference DC voltage value as well as robustness to speed and load disturbances in the system.

Dinko Vukadinovi?; Mateo Baši?; Cat Ho Nguyen; Nhu Lan Vu; Tien Duy Nguyen

2014-01-01T23:59:59.000Z

119

Distribution System Voltage Performance Analysis for High-Penetration Photovoltaics  

SciTech Connect

This report examines the performance of commonly used distribution voltage regulation methods under reverse power flow.

Liu, E.; Bebic, J.

2008-02-01T23:59:59.000Z

120

International Symposium on High Voltage Engineering, London, August 1999 page 1 of 4  

E-Print Network (OSTI)

substations (GIS) are described. Calculated transfer functions are presented, showing that transverse electric) in gas insulated substations (GIS) has been described in detail previously [1]. In this paper, we present that occurs somewhere in the insulating region between the high voltage (HV) conductor and the metal cladding

Judd, Martin

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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121

Method for improving voltage regulation of batteries, particularly Li/FeS/sub 2/ thermal batteries  

DOE Patents (OSTI)

Batteries are improved, especially with respect to voltage regulation properties, by employing as anode and cathode compositions, those which fall in a thermodynamically invariant region of the metallurgical phase diagram of the combination of the constituent components. The invention is especially useful in the Li/FeS/sub 2/ system.

Godshall, N.A.

1986-06-10T23:59:59.000Z

122

Physical simulation study of dynamic voltage instability  

SciTech Connect

This paper presents a physical simulation of the dynamic behavior of voltage instability in an interconnected multimachine environment. The dynamic evolving process leading to eventual voltage collapse, the scenario of the progressive reactive support reduction resulting from the MXL protection relays, the OLTC operation, and the effect of switched-in capacitor banks are examined using physical facilities in the laboratory. The physical simulation results are also compared with digital simulation results. This physical investigation provides a reliable foundation for the effective development of assessment approaches and countermeasures.

Tso, S.K.; Zhu, T.X. [Univ. of Hong Kong (Hong Kong); Zeng, Q.Y. [Electric Power Research Inst., Beijing (China); Lo, K.L. [Univ. of Strathclyde, Glasgow (United Kingdom). Dept. of Electrical and Electrical Engineering

1995-12-31T23:59:59.000Z

123

Calmodulin and calcium differentially regulate the neuronal Nav1.1 voltage-dependent sodium channel  

SciTech Connect

Highlights: {yields} Both Ca{sup ++}-Calmodulin (CaM) and Ca{sup ++}-free CaM bind to the C-terminal region of Nav1.1. {yields} Ca{sup ++} and CaM have both opposite and convergent effects on I{sub Nav1.1}. {yields} Ca{sup ++}-CaM modulates I{sub Nav1.1} amplitude. {yields} CaM hyperpolarizes the voltage-dependence of activation, and increases the inactivation rate. {yields} Ca{sup ++} alone antagonizes CaM for both effects, and depolarizes the voltage-dependence of inactivation. -- Abstract: Mutations in the neuronal Nav1.1 voltage-gated sodium channel are responsible for mild to severe epileptic syndromes. The ubiquitous calcium sensor calmodulin (CaM) bound to rat brain Nav1.1 and to the human Nav1.1 channel expressed by a stably transfected HEK-293 cell line. The C-terminal region of the channel, as a fusion protein or in the yeast two-hybrid system, interacted with CaM via a consensus C-terminal motif, the IQ domain. Patch clamp experiments on HEK1.1 cells showed that CaM overexpression increased peak current in a calcium-dependent way. CaM had no effect on the voltage-dependence of fast inactivation, and accelerated the inactivation kinetics. Elevating Ca{sup ++} depolarized the voltage-dependence of fast inactivation and slowed down the fast inactivation kinetics, and for high concentrations this effect competed with the acceleration induced by CaM alone. Similarly, the depolarizing action of calcium antagonized the hyperpolarizing shift of the voltage-dependence of activation due to CaM overexpression. Fluorescence spectroscopy measurements suggested that Ca{sup ++} could bind the Nav1.1 C-terminal region with micromolar affinity.

Gaudioso, Christelle; Carlier, Edmond; Youssouf, Fahamoe [INSERM U641, Institut Jean Roche, Marseille F-13344 (France) [INSERM U641, Institut Jean Roche, Marseille F-13344 (France); Universite de la Mediterranee, Faculte de Medecine Secteur Nord, IFR 11, Marseille F-13344 (France); Clare, Jeffrey J. [Eaton Pharma Consulting, Eaton Socon, Cambridgeshire PE19 8EF (United Kingdom)] [Eaton Pharma Consulting, Eaton Socon, Cambridgeshire PE19 8EF (United Kingdom); Debanne, Dominique [INSERM U641, Institut Jean Roche, Marseille F-13344 (France) [INSERM U641, Institut Jean Roche, Marseille F-13344 (France); Universite de la Mediterranee, Faculte de Medecine Secteur Nord, IFR 11, Marseille F-13344 (France); Alcaraz, Gisele, E-mail: gisele.alcaraz@univmed.fr [INSERM U641, Institut Jean Roche, Marseille F-13344 (France) [INSERM U641, Institut Jean Roche, Marseille F-13344 (France); Universite de la Mediterranee, Faculte de Medecine Secteur Nord, IFR 11, Marseille F-13344 (France)

2011-07-29T23:59:59.000Z

124

Electro-optic voltage sensor for sensing voltage in an E-field  

DOE Patents (OSTI)

A miniature electro-optic voltage sensor system capable of accurate operation at high voltages. The system employs a transmitter, a sensor disposed adjacent to but out of direct electrical contact with a conductor on which the voltage is to be measured, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor where the beam undergoes the Pockels electro-optic effect. The electro-optic effect causes phase shifting in the beam, which is in turn converted to a pair of independent beams, from which the voltage of a system based on its E-field is determined when the two beams are normalized by the signal processor. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse whose ellipticity varies between -1 and +1 in proportion to voltage) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Idaho Falls, ID); Renak, Todd W. (Idaho Falls, ID)

1999-01-01T23:59:59.000Z

125

Wide Area Security Region Final Report  

SciTech Connect

This report develops innovative and efficient methodologies and practical procedures to determine the wide-area security region of a power system, which take into consideration all types of system constraints including thermal, voltage, voltage stability, transient and potentially oscillatory stability limits in the system. The approach expands the idea of transmission system nomograms to a multidimensional case, involving multiple system limits and parameters such as transmission path constraints, zonal generation or load, etc., considered concurrently. The security region boundary is represented using its piecewise approximation with the help of linear inequalities (so called hyperplanes) in a multi-dimensional space, consisting of system parameters that are critical for security analyses. The goal of this approximation is to find a minimum set of hyperplanes that describe the boundary with a given accuracy. Methodologies are also developed to use the security hyperplanes, pre-calculated offline, to determine system security margins in real-time system operations, to identify weak elements in the system, and to calculate key contributing factors and sensitivities to determine the best system controls in real time and to assist in developing remedial actions and transmission system enhancements offline . A prototype program that automates the simulation procedures used to build the set of security hyperplanes has also been developed. The program makes it convenient to update the set of security hyperplanes necessitated by changes in system configurations. A prototype operational tool that uses the security hyperplanes to assess security margins and to calculate optimal control directions in real time has been built to demonstrate the project success. Numerical simulations have been conducted using the full-size Western Electricity Coordinating Council (WECC) system model, and they clearly demonstrated the feasibility and the effectiveness of the developed technology. Recommendations for the future work have also been formulated.

Makarov, Yuri V.; Lu, Shuai; Guo, Xinxin; Gronquist, James; Du, Pengwei; Nguyen, Tony B.; Burns, J. W.

2010-03-31T23:59:59.000Z

126

CARRIER BASED PWM-VSI DRIVES IN THE OVERMODULATION REGION  

E-Print Network (OSTI)

CARRIER BASED PWM-VSI DRIVES IN THE OVERMODULATION REGION By Ahmet M. Hava A dissertation submitted in motor drive and other three-phase power conversion applications as voltage current sources the inverter energy e ciency, waveform quality, and voltage linearity. However, the dependence

Hava, Ahmet

127

Electro-optic high voltage sensor  

DOE Patents (OSTI)

A small sized electro-optic voltage sensor capable of accurate measurement of high levels of voltages without contact with a conductor or voltage source is provided. When placed in the presence of an electric field, the sensor receives an input beam of electromagnetic radiation into the sensor. A polarization beam displacer serves as a filter to separate the input beam into two beams with orthogonal linear polarizations. The beam displacer is oriented in such a way as to rotate the linearly polarized beams such that they enter a Pockels crystal having at a preferred angle of 45 degrees. The beam displacer is therefore capable of causing a linearly polarized beam to impinge a crystal at a desired angle independent of temperature. The Pockels electro-optic effect induces a differential phase shift on the major and minor axes of the input beam as it travels through the Pockels crystal, which causes the input beam to be elliptically polarized. A reflecting prism redirects the beam back through the crystal and the beam displacer. On the return path, the polarization beam displacer separates the elliptically polarized beam into two output beams of orthogonal linear polarization representing the major and minor axes. The system may include a detector for converting the output beams into electrical signals, and a signal processor for determining the voltage based on an analysis of the output beams. The output beams are amplitude modulated by the frequency of the electric field and the amplitude of the output beams is proportional to the magnitude of the electric field, which is related to the voltage being measured.

Davidson, James R. (Idaho Falls, ID); Seifert, Gary D. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

128

Effect of high solenoidal magnetic fields on breakdown voltages of high vacuum 805 MHz cavities  

SciTech Connect

There is an on going international collaboration studying the feasibility and cost of building a muon collider or neutrino factory [1,2]. An important aspect of this study is the full understanding of ionization cooling of muons by many orders of magnitude for the collider case. An important muon ionization cooling experiment, MICE [3], has been proposed to demonstrate and validate the technology that could be used for cooling. Ionization cooling is accomplished by passing a high-emittance muon beam alternately through regions of low Z material, such as liquid hydrogen, and very high accelerating RF Cavities within a multi-Tesla solenoidal field. To determine the effect of very large solenoidal magnetic fields on the generation of dark current, x-rays and on the breakdown voltage gradients of vacuum RF cavities, a test facility has been established at Fermilab in Lab G. This facility consists of a 12 MW 805 MHz RF station and a large warm bore 5 T solenoidal superconducting magnet containing a pill box type cavity with thin removable window apertures. This system allows dark current and breakdown studies of different window configurations and materials. The results of this study will be presented. The study has shown that the peak achievable accelerating gradient is reduced by a factor greater than 2 when solenoidal field of greater than 2 T are applied to the cavity.

Moretti, A.; Bross, A.; Geer, S.; Qian, Z.; /Fermilab; Norem, J.; /Argonne; Li, D.; Zisman, M.; /LBL, Berkeley; Torun, Y.; /IIT, Chicago; Rimmer, R.; /Jefferson Lab; Errede,; /Illinois U., Urbana

2005-10-01T23:59:59.000Z

129

Distribution System Voltage Regulation by Distributed Energy Resources  

SciTech Connect

This paper proposes a control method to regulate voltages in 3 phase unbalanced electrical distribution systems. A constrained optimization problem to minimize voltage deviations and maximize distributed energy resource (DER) active power output is solved by harmony search algorithm. IEEE 13 Bus Distribution Test System was modified to test three different cases: a) only voltage regulator controlled system b) only DER controlled system and c) both voltage regulator and DER controlled system. The simulation results show that systems with both voltage regulators and DER control provide better voltage profile.

Ceylan, Oguzhan [ORNL; Liu, Guodong [ORNL; Xu, Yan [ORNL; Tomsovic, Kevin [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

130

Modeling Techniques Used to Analyze Safety of Payloads for Generic Missile Type Weapons Systems During an Indirect Lightning Strike  

SciTech Connect

During lightning strikes buildings and other structures can act as imperfect Faraday Cages, enabling electromagnetic fields to be developed inside the facilities. Some equipment stored inside these facilities may unfortunately act as antenna systems. It is important to have techniques developed to analyze how much voltage, current, or energy dissipation may be developed over valuable components. In this discussion we will demonstrate the modeling techniques used to accurately analyze a generic missile type weapons system as it goes through different stages of assembly. As work is performed on weapons systems detonator cables can become exposed. These cables will form different monopole and loop type antenna systems that must be analyzed to determine the voltages developed over the detonator regions. Due to the low frequencies of lightning pulses, a lumped element circuit model can be developed to help analyze the different antenna configurations. We will show an example of how numerical modeling can be used to develop the lumped element circuit models used to calculate voltage, current, or energy dissipated over the detonator region of a generic missile type weapons system.

Perkins, M P; Ong, M M; Crull, E W; Brown Jr., C G

2009-07-21T23:59:59.000Z

131

Some Features of an Electrostatic Generator and Ion Source for High Voltage Research  

Science Journals Connector (OSTI)

A compact generator of the Van de Graaff type is described in which several new features have been incorporated. Short-circuit current of one milliampere is available. When operating at 600 kv as voltage supply for accelerating protons or deutersons, 130?a of charged particles at the target have been obtained from an unusual low voltage capillary arc source. In normal operation as a neutron generator, the equivalent of 15 curies of radon-beryllium is readily produced by the reaction Li+D, and 60 curies by the D on D reaction.

I. A. Getting; J. B. Fisk; H. G. Vogt

1939-12-01T23:59:59.000Z

132

The design, construction, and operation of long-distance high-voltage electricity transmission technologies.  

SciTech Connect

This report focuses on transmission lines, which operate at voltages of 115 kV and higher. Currently, the highest voltage lines comprising the North American power grid are at 765 kV. The grid is the network of transmission lines that interconnect most large power plants on the North American continent. One transmission line at this high voltage was built near Chicago as part of the interconnection for three large nuclear power plants southwest of the city. Lines at this voltage also serve markets in New York and New England, also very high demand regions. The large power transfers along the West Coast are generally at 230 or 500 kV. Just as there are practical limits to centralization of power production, there are practical limits to increasing line voltage. As voltage increases, the height of the supporting towers, the size of the insulators, the distance between conductors on a tower, and even the width of the right-of-way (ROW) required increase. These design features safely isolate the electric power, which has an increasing tendency to arc to ground as the voltage (or electrical potential) increases. In addition, very high voltages (345 kV and above) are subject to corona losses. These losses are a result of ionization of the atmosphere, and can amount to several megawatts of wasted power. Furthermore, they are a local nuisance to radio transmission and can produce a noticeable hum. Centralized power production has advantages of economies of scale and special resource availability (for instance, hydro resources), but centralized power requires long-distance transfers of power both to reach customers and to provide interconnections for reliability. Long distances are most economically served at high voltages, which require large-scale equipment and impose a substantial footprint on the corridors through which power passes. The most visible components of the transmission system are the conductors that provide paths for the power and the towers that keep these conductors at a safe distance from each other and from the ground and the natural and built environment. Common elements that are generally less visible (or at least more easily overlooked) include the maintained ROW along the path of the towers, access roads needed for maintenance, and staging areas used for initial construction that may be restored after construction is complete. Also visible but less common elements along the corridor may include switching stations or substations, where lines of similar or different voltages meet to transfer power.

Molburg, J. C.; Kavicky, J. A.; Picel, K. C.

2008-03-03T23:59:59.000Z

133

Superconducting Fault Current Limiter for Transmission Voltage  

Science Journals Connector (OSTI)

Within a collaboration of American Superconductor, Siemens, Nexans and Southern California Edison one electrical phase of a resistive superconducting fault current limiter for the 115 kV transmission voltage level has been designed and manufactured. The active part of the limiter consists of 63 bifilar coils made of 12 mm wide steel-stabilized YBCO conductor and is housed in a cryostat operated at 5 bar and 74 K. The first phase was completely assembled and successfully subjected to power switching tests and high voltage tests. The basic design of the system and the test results are reported. The work was funded in part by US-DOE under Contract Number DE-FC26-07NT43243.

Hans-Peter Kraemer; Wolfgang Schmidt; Hong Cai; Bruce Gamble; David Madura; Tim MacDonald; Joe McNamara; Walther Romanosky; Greg Snitchler; Nicolas Lallouet; Frank Schmidt; Syed Ahmed

2012-01-01T23:59:59.000Z

134

Electrical system architecture having high voltage bus  

DOE Patents (OSTI)

An electrical system architecture is disclosed. The architecture has a power source configured to generate a first power, and a first bus configured to receive the first power from the power source. The architecture also has a converter configured to receive the first power from the first bus and convert the first power to a second power, wherein a voltage of the second power is greater than a voltage of the first power, and a second bus configured to receive the second power from the converter. The architecture further has a power storage device configured to receive the second power from the second bus and deliver the second power to the second bus, a propulsion motor configured to receive the second power from the second bus, and an accessory motor configured to receive the second power from the second bus.

Hoff, Brian Douglas (East Peoria, IL); Akasam, Sivaprasad (Peoria, IL)

2011-03-22T23:59:59.000Z

135

210 nature neuroscience volume 5 no 3 march 2002 Calcium entry into cells through voltage-gated Ca2+ channels  

E-Print Network (OSTI)

voltage-gated Ca2+ channels initiates a wide range of cellular processes including protein phosphorylation, gene expression and neurotransmitter release1. Neuronal Ca2+ channels consist of a pore-forming 1 by neurotransmitters inhibits Cav2.1 and Cav2.2 channels, which mediate P/Q-type and N- type Ca2+ currents

Palczewski, Krzysztof

136

Low Voltage White Phosphorescent OLED Achievements  

Energy.gov (U.S. Department of Energy (DOE))

Universal Display Corporation (UDC) and its research partners at Princeton University and the University of Southern California have succeeded in developing a white phosphorescent OLED (PHOLED™) that achieved a record efficiency of 20 lumens per watt. This achievement is the result of the team's collaborative efforts to increase the efficiency of PHOLED lighting by focusing on two critical factors: lowering the drive voltages and increasing the amount of light extracted.

137

Classification of Voltage Sags Based on MPCA Models  

Science Journals Connector (OSTI)

In this paper, we introduce a new framework for classification of short duration voltage reductions in the area of Power Quality Monitoring using Multiway Principal Component Analysis (MPCA). Firstly, we recast the sags occurred in High Voltage (HV) ...

Abbas Khosravi; Joaquim Melendez; Joan Colomer

2007-06-01T23:59:59.000Z

138

A BIST Technique for RF Voltage-Controlled Oscillators  

Science Journals Connector (OSTI)

A built-in self-test (BIST) architecture is proposed for voltage-controlled oscillators (VCO) operating at multigigahertz frequencies. By utilizing a frequency divider and a frequency-to-voltage converter (FVC), the output frequency and tuning range ...

Hsieh-Hung Hsieh; Yen-Chih Huang; Liang-Hung Lu; Guo-Wei Huang

2007-10-01T23:59:59.000Z

139

Low voltage amplifier architecture for high speed switched capacitor circuits  

E-Print Network (OSTI)

This work concentrates on circuit realization of high speed and low voltage switched capacitor circuits, with emphasis on the operational transconductance amplifier (OTA). An overview of switched capacitor circuits is given. Speed and voltage...

Shankar, Asit

2012-06-07T23:59:59.000Z

140

Nickel-hydrogen voltage-efficiency model  

SciTech Connect

A model for providing voltage vs. current relationships and coulombic efficiency has been developed applicable to Nickel-Hydrogen (NiH{sub 2}) batteries. The performance relationships can be used directly in dynamic electrical energy storage system models or customized by predicting the particular case of voltage as a function of applied current. The algorithm utilizes electrochemical models for competing cell reactions: a single Butler-Volmer equation for the main NiH{sub 2} reaction, and a Tafel relationship for oxygen generation. For the main NiH{sub 2} reaction, the dependence on state-of-charge is introduced via a Nerstian term containing concentrations of active materials present. Oxygen recombination and self-discharge are modeled as first order reactions. Model parameters are determined by a modified Marquardt algorithm to provide a best-fit of both voltage and pressure data to the physical model. The data fit is from electrical characterization tests which may include capacity measurements or repeated electrical cycling at specified depths-of-discharge or with particular regimens. It has been found that test performance data covering a wide domain of the independent variables (temperature, current, and state-of-charge) will produce a well-behaved model.

Hafen, D.P.; Armantrout, J.D. [Lockheed Martin Missiles and Space, Sunnyvale, CA (United States)

1996-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Development of a quantum-voltage-calibrated noise thermometer at NIM  

SciTech Connect

A quantum-voltage-calibrated Johnson-noise thermometer was developed at NIM, which measures the Boltzmann constant k by comparing the thermal noise across a 100 ? sense resistor at the temperature of the triple point of water with the pseudo-random frequency-comb voltage waveform synthesized with a bipolar-pulse-driven quantum-voltage-noise source. A measurement with integration period of 10 hours and bandwidth of 640 kHz resulted in a relative offset of 0.5×10{sup ?6} from the current CODATA value of k, and a type A relative standard uncertainty of 23×10{sup ?6}. Benefiting from closely matched noise powers and transmission-line impedances and small nonlinearities in the cross-correlation electronics, the derived k shows self-consistent values and standard uncertainties for different measurement bandwidths.

Qu, J.; Zhang, J. T.; Fu, Y. [National Institute of Metrology, Beijing 100013, P. R. (China)] [National Institute of Metrology, Beijing 100013, P. R. (China); Rogalla, H.; Pollarolo, A.; Benz, S. P. [National Institute of Standards and Technology, Boulder, CO 80305 (United States)] [National Institute of Standards and Technology, Boulder, CO 80305 (United States)

2013-09-11T23:59:59.000Z

142

Analysis and design of an electronic voltage ratchet  

E-Print Network (OSTI)

and decay. Impulse voltages are produced through the discharging of 0, capacitor into a shaping network consisting of resistors and a. capacitor as is shown in Figure 2. 9. The operation of the impulse generator is as follows. Capacitor Ci is charged from... voltage shaping network. as possible in order to reduce oscillations in the wavefront and wavetail portions of the impulse voltage [1). The impulse voltage generator requires a, highly charged capacitor or bank of capacitors. Capacitors may be charged...

Menendez, Jorge Carlos

2012-06-07T23:59:59.000Z

143

Measurement of semiconductor local carrier concentration from displacement current-voltage curves with a scanning vibrating probe  

Science Journals Connector (OSTI)

A theoretical equation has been fitted to displacement current-voltage curves of semiconductor in order to obtain the local carrier concentration of the semiconductor. The distance between a semiconductor surface and a scanning probe is changed sinusoidally and is adjusted as small as a few nm at which tunneling current flows. Displacement current due to the change in electric flux from the semiconductor surface to the scanning probe flows periodically in accordance with the vibration of the scanning probe, and it is separated from tunneling current using a two-phase lock-in amplifier. The displacement current-probe voltage curve is analyzed by taking into account two-dimensional electric flux profile from the semiconductor surface. It is realized that the lateral resolution of the displacement current depends on the probe voltage and that it is between one-eighth and one-fifteenth smaller than the top radius of the probe since the depletion-layer width of the semiconductor is determined by the probe voltage, the distance, and the carrier concentration. The theoretical displacement current-voltage curves are in good agreement with the measurement in both voltage regions where the majority carriers are accumulated and depleted. The local carrier concentration can be determined by fitting the theoretical displacement current-voltage curve with the experimental results.

Yutaka Majima; Yutaka Oyama; Mitsumasa Iwamoto

2000-07-15T23:59:59.000Z

144

LM2907LM2917FrequencytoVoltageConverter February 1995  

E-Print Network (OSTI)

TL H 7942 LM2907LM2917FrequencytoVoltageConverter February 1995 LM2907 LM2917 Frequency to Voltage Converter General Description The LM2907 LM2917 series are monolithic frequency to voltage converters doubling for low ripple full input protection in two versions (LM2907-8 LM2917-8) and its output swings

Wedeward, Kevin

145

Low voltage vertical recording preamplifier for hard disk drives  

E-Print Network (OSTI)

. . . . . . . . . . . . . . . . . 4 2 Input drivers of the preamplifier along with the decoupling caps and parasitics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Voltage bias voltage sensing scheme . . . . . . . . . . . . . . . . . . . 8 4 Current bias current... sensing scheme . . . . . . . . . . . . . . . . . . 9 5 Current bias scheme which common mode sense voltage to DE . . . . 10 6 Decoupling the inputs of the differential pair using feedback . . . . . 11 7 Barkhausen noise...

Mellachervu, Ramachandra Murthy

2004-11-15T23:59:59.000Z

146

The Matrix Converter Drive Performance Under Abnormal Input Voltage Conditions  

E-Print Network (OSTI)

that generates variable magnitude variable frequency output voltage from the ac utility line. It has high power voltage disturbance related performance issues of the MC drive. Since the MC is a direct frequencyThe Matrix Converter Drive Performance Under Abnormal Input Voltage Conditions Jun-Koo Kang

Hava, Ahmet

147

Voltage-dependent calcium channels and currents in native neurons and other cells have been divided into high voltage  

E-Print Network (OSTI)

Voltage-dependent calcium channels and currents in native neurons and other cells have been divided than one subtype of channel. A new subfamily of voltage-dependent calcium channel á1 subunit genes. 1999), having four domains, each with a voltage sensor and a pore-forming P loop. However

Dolphin, Annette C.

148

Capacitively coupled RF voltage probe having optimized flux linkage  

DOE Patents (OSTI)

An RF sensor having a novel current sensing probe and a voltage sensing probe to measure voltage and current. The current sensor is disposed in a transmission line to link all of the flux generated by the flowing current in order to obtain an accurate measurement. The voltage sensor is a flat plate which operates as a capacitive plate to sense voltage on a center conductor of the transmission line, in which the measured voltage is obtained across a resistance leg of a R-C differentiator circuit formed by the characteristic impedance of a connecting transmission line and a capacitance of the plate, which is positioned proximal to the center conductor.

Moore, James A. (Powell, TN); Sparks, Dennis O. (Maryville, TN)

1999-02-02T23:59:59.000Z

149

Method of Controlling Corona Effects and Breakdown Voltage of Small Air Gaps Stressed by Impulse Voltages  

E-Print Network (OSTI)

This paper investigates the influence of a resistor on the dielectric behavior of an air gap. The resistor is connected in series with the air gap and the latter is stressed by impulse voltage. Air gap arrangements of different geometry with either the rod or the plate grounded are stressed with impulse voltages of both positive and negative polarity. The resistor is connected in series with the air gap in the return circuit connecting the gap with the impulse generator. The method followed involves the investigation of the graphs of the charging time concerning the air gaps capacitances, in connection to the value of the resistor, the geometry of the gap, the effect of grounding and the polarity effect. It is determined that the charging time of the air gap increases, as the value of the resistor increases. It is also determined that the peak voltage value of the fully charged air gap decreases as the value of the resistor increases. The results of the mathematical and simulation analysis are compared with the results of the oscillograms taken from experimental work. In addition and consequently to the above results it is concluded from the experimental work that the in series connection of the resistor in the circuit has significant influence on corona pulses (partial discharges) occurring in the gap and on the breakdown voltage of the gap. A new method of controlling the corona effects and consequently the breakdown voltage of small air gaps stressed by impulse voltage of short duration in connection to the ground effect and the polarity effect has arisen. Furthermore through mathematical analysis of the charging graphs obtained from simulation and experimental oscillograms there was a calculation of the values of the capacitance of the air gaps in relation to their geometry and the results were compared to the values calculated with mathematical analysis.

Athanasios Maglaras; Trifon Kousiouris; Frangiskos Topalis; Dimitrios Katsaros; Leandros A. Maglaras; Konstantina Giannakopoulou

2014-10-15T23:59:59.000Z

150

Transient recovery voltage considerations in the application of medium voltage circuit breakers  

SciTech Connect

Medium Voltage Circuit Breakers can fail to interrupt 3-phase fault currents when power systems have Transient Recovery Voltage (TRV) characteristics which exceed the rating of the circuit breaker. This paper examines the application of 13.8kV generation and load switchgear for an oil refinery in which circuit parameters as originally designed would have exceeded the 13.8kV circuit breakers TRV ratings had corrective measures not been taken. This paper illustrates this case and discusses the basis of TRV, how TRV is assessed, and alternative actions taken to bring circuits to within the 13.8 kV circuit breaker ratings.

Swindler, D.L.; Schwartz, P.; Hamer, P.S.; Lambert, S.R.

1995-12-31T23:59:59.000Z

151

Kirchhoff voltage law corrected for radiating circuits  

E-Print Network (OSTI)

When a circular loop composed by a RLC is put to oscillate, the oscillation will eventually vanish in an exponentially decaying current, even considering superconducting wires, due to the emission of electric and magnetic dipole radiation. In this work we propose a modification on the Kirchhoff voltage law by adding the radiative contributions to the energy loss as an effective resistance, whose value is relatively small when compared to typical resistance value, but fundamental to describe correctly real circuits. We have also analysed the change in the pattern of the radiation spectra emitted by the circuit as we vary both the effective and electrical resistance.

Lara, Vitor

2014-01-01T23:59:59.000Z

152

A High Voltage Direct Current Generator  

Science Journals Connector (OSTI)

When powdered materials are blown through metal tubes by means of compressed air considerable quantities of electricity are produced by contact electrification. It was found that 6×10-5 coulombs could be produced per gram of diatomaceous earth, a form of silica, blown through a short length of copper tube. A generator of extremely high voltage is proposed, and a small scale model of such a generator is described, by means of which currents of 8×10-5 amperes at 260 kilovolts were generated.

Richard E. Vollrath

1932-10-15T23:59:59.000Z

153

Chemical detection and laser wavelength stabilization employing spectroscopic absorption via laser compliance voltage sensing  

DOE Patents (OSTI)

Systems and methods are disclosed that provide a direct indication of the presence and concentration of an analyte within the external cavity of a laser device that employ the compliance voltage across the laser device. The systems can provide stabilization of the laser wavelength. The systems and methods can obviate the need for an external optical detector, an external gas cell, or other sensing region and reduce the complexity and size of the sensing configuration.

Taubman, Matthew S; Phillips, Mark C

2014-03-18T23:59:59.000Z

154

Sacramento Area Voltage Support Draft Environmental Impact Statement  

SciTech Connect

The Western Area Power Administration's Central Valley Project transmission system forms an integral part of the interconnected Sacramento area transmission grid. Western is contractually responsible to oversee that the system is operated in accordance with strict reliability standards. Growth in the greater Sacramento, California area and power imported from generation outside the region, have increased the demand on the interconnected electric transmission system, leading to transmission system overloads and reducing the reliability and security of the area power system. Western has prepared this Sacramento Area Voltage Support (SVS) Draft Environmental Impact Statement (EIS) in compliance with Federal laws, regulations and guidelines, principally the ''National Environmental Policy Act'' (NEPA). This Draft EIS evaluates the potential environmental effects of physical improvements to the area's power system. Enhancements are needed to improve system reliability and provide voltage support for the Sacramento area. The results of public scoping meetings, workshops, meetings with agencies, and earlier studies by Western and area utilities helped to develop a range of alternatives for analysis. The Proposed Action involves: Constructing a new double-circuit, 230-kV transmission line paralleling the existing double-circuit, 230-kV line from the O'Banion Substation to the Elverta Substation; Realigning a portion of the existing Cottonwood-Roseville single-circuit, 230-kV transmission line north of Elverta Substation; and Reconductoring the existing double-circuit, 230-kV transmission line from the Elverta Substation to the Tracy Substation. Public Hearings on the Draft EIS will be held between December 9-12, 2002. Comments on this Draft EIS are encouraged and should be sent to Ms. Loreen McMahon (above). Comments must be received by December 30, 2002.

N /A

2002-11-15T23:59:59.000Z

155

Sacramento Area Voltage Support Final Environmental Impact Statement  

SciTech Connect

The Western Area Power Administration's Central Valley Project transmission system forms an integral part of the interconnected Sacramento area transmission grid. Western is contractually responsible to oversee that the system is operated in accordance with strict reliability standards. Growth in the greater Sacramento, California area and power imported from generation outside the region, have increased the demand on the interconnected electric transmission system, leading to transmission system overloads and reducing the reliability and security of the area power system. Western has prepared this Sacramento Area Voltage Support (SVS) Draft Environmental Impact Statement (EIS) in compliance with Federal laws, regulations and guidelines, principally the National Environmental Policy Act (NEPA). This Draft EIS evaluates the potential environmental effects of physical improvements to the area's power system. Enhancements are needed to improve system reliability and provide voltage support for the Sacramento area. The results of public scoping meetings, workshops, meetings with agencies, and earlier studies by Western and area utilities helped to develop a range of alternatives for analysis. The Proposed Action involves: (1) Constructing a new double-circuit, 230-kV transmission line paralleling the existing double-circuit, 230-kV line from the O'Banion Substation to the Elverta Substation; (2) Realigning a portion of the existing Cottonwood-Roseville single-circuit, 230-kV transmission line north of Elverta Substation; and (3) Reconductoring the existing double-circuit, 230-kV transmission line from the Elverta Substation to the Tracy Substation. Public Hearings on the Draft EIS will be held between December 9-12, 2002. Comments on this Draft EIS are encouraged and should be sent to Ms. Loreen McMahon (above). Comments must be received by December 30, 2002.

N /A

2003-09-19T23:59:59.000Z

156

Property:GeothermalRegion | Open Energy Information  

Open Energy Info (EERE)

Property Name GeothermalRegion Property Name GeothermalRegion Property Type Page Pages using the property "GeothermalRegion" Showing 25 pages using this property. (previous 25) (next 25) A Abraham Hot Springs Geothermal Area + Northern Basin and Range Geothermal Region + Adak Geothermal Area + Alaska Geothermal Region + Aidlin Geothermal Facility + Holocene Magmatic Geothermal Region + Akun Strait Geothermal Area + Alaska Geothermal Region + Akutan Fumaroles Geothermal Area + Alaska Geothermal Region + Akutan Geothermal Project + Alaska Geothermal Region + Alum Geothermal Area + Walker-Lane Transition Zone Geothermal Region + Alum Geothermal Project + Walker-Lane Transition Zone Geothermal Region + Alvord Hot Springs Geothermal Area + Northwest Basin and Range Geothermal Region +

157

Safe epoxy encapsulant for high voltage magnetics  

SciTech Connect

This paper describes the use of Formula 456, an aliphatic amine cured epoxy for impregnating coils and high voltage transformers. Sandia has evaluated a number of MDA-free epoxy encapsulants which relied on either anhydride or other aromatic amine curing agents. The use of aliphatic amine curing agents was more recently evaluated and has resulted in the definition of Formula 456 resin. Methylene dianiline (MDA) has been used for more than 20 years as the curing agent for various epoxy formulations throughout the Department of Energy and much of industry. Sandia National Laboratories began the process of replacing MDA with other formulations because of regulations imposed by OSHA on the use of MDA. OSHA has regulated MDA because it is a suspect carcinogen. Typically the elimination of OSHA-regulated materials provides a rare opportunity to qualify new formulations in a range of demanding applications. It was important to take full advantage of that opportunity, although the associated materials qualification effort was costly. Small high voltage transformers are one of those demanding applications. The successful implementation of the new formulation for high reliability transformers will be described. The test results that demonstrate the parts are qualified for use in DOE weapon systems will be presented.

Sanchez, R.O.; Archer, W.E.

1998-01-01T23:59:59.000Z

158

Accelerator System Development at High Voltage Engineering  

SciTech Connect

Throughout the years, HVE has continuously extended the capabilities of its accelerator systems to meet the rising demands from a diverse field of applications, among which are deep level ion implantation, micro-machining, neutron production for biomedical research, isotope production or accelerator mass spectrometry. Characteristic for HVE accelerators is the coaxial construction of the all solid state power supply around the acceleration tubes. With the use of solid state technology, the accelerators feature high stability and very low ripple. Terminal voltages range from 1 to 6 MV for HVE Singletrons and Tandetrons. The high-current versions of these accelerators can provide ion beams with powers of several kW. In the last years, several systems have been built with terminal voltages of 1.25 MV, 2 MV and 5 MV. Recently, the first system based on a 6 MV Tandetron has passed the factory tests. In this paper we describe the characteristics of the HVE accelerator systems and present as example recent systems.

Klein, M. G.; Gottdang, A.; Haitsma, R. G.; Mous, D. J. W. [High Voltage Engineering Europa B.V., P.O. Box 99, Amersfoort 3800 AB (Netherlands)

2009-03-10T23:59:59.000Z

159

Low voltage operation of plasma focus  

Science Journals Connector (OSTI)

Plasma foci of compact sizes and operating with low energies (from tens of joules to few hundred joules) have found application in recent years and have attracted plasma-physics scientists and engineers for research in this direction. We are presenting a low energy and miniature plasma focus which operates from a capacitor bank of 8.4 ? ? F capacity charged at 4.2–4.3 kV and delivering approximately 52 kA peak current at approximately 60 nH calculated circuit inductance. The total circuit inductance includes the plasma focusinductance. The reported plasma focus operates at the lowest voltage among all reported plasma foci so far. Moreover the cost of capacitor bank used for plasma focus is nearly 20 U.S. dollars making it very cheap. At low voltage operation of plasma focus the initial breakdown mechanism becomes important for operation of plasma focus. The quartz glass tube is used as insulator and breakdown initiation is done on its surface. The total energy of the plasma focus is approximately 75 J. The plasma focus system is made compact and the switching of capacitor bank energy is done by manual operating switch. The focus is operated with hydrogen and deuterium filled at 1–2 mbar.

Rohit Shukla; S. K. Sharma; P. Banerjee; R. Das; P. Deb; T. Prabahar; B. K. Das; B. Adhikary; A. Shyam

2010-01-01T23:59:59.000Z

160

Sacramento Area Voltage Support - Environment - Sierra Nevada...  

NLE Websites -- All DOE Office Websites (Extended Search)

Sierra Nevada Region (SNR) operates and maintains more than 1,200 miles of transmission lines. These transmission lines are interconnected to other Sacramento area...

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

The role of linear and voltage-dependent ionic currents in the generation of slow wave oscillations  

E-Print Network (OSTI)

inward current is not necessary for generating oscillations. Instead, a current INL that is linear. The current INL can be considered a linear approximation to the negative-conductance region of the current­voltage relation- ship of a regenerative inward current. Using a simple conductance-based model, we show that INL

Bose, Amitabha

162

Design and applications of a flicker voltage generator  

SciTech Connect

In this paper, a 200W flicker voltage generator is made by using microcomputers and linear amplification circuits. The modulation amplitudes and frequencies based on the UIE {Delta}V{sub 10} evaluation can be arbitrarily assigned by software with high accuracy. The flicker voltage signals measured at the customer side also can be re-generated. Some applications, such as evaluating the effects of flicker voltage on incandescent and compact fluorescent lamps (CFLs), are also made. From experimental tests by use of the flicker voltage generator, the properties of some compact fluorescent lamps and incandescent lamps are compared. Those properties describe the relation between input voltage variation and output flux of lamps, such that there is direct description of influences of flicker voltages on lamps.

Chang, W.N.; Wu, C.J. [National Taiwan Inst. of Tech., Peitow-Taipei (Taiwan, Province of China). Dept. of Electrical Engineering

1995-12-31T23:59:59.000Z

163

Vehicle Specifications Battery Type: Li-Ion  

NLE Websites -- All DOE Office Websites (Extended Search)

Under hood above powertrain Under hood above powertrain Nominal System Voltage: 333 V Rated Capacity (C/3): 40 Ah Cooling Method: Glycol / Water mix Powertrain Motor Type: DC Brushless Number of Motors: One Motor Cooling Type: Glycol / Water mix Drive Wheels: Rear Wheel Drive Transmission: None (gear ratio only in rear axle) Charger Location: Underhood Charger Port: Driver's side, front quarter panel Type: Conductive (J1772 connector) Input Voltage(s): 120 or 240 VAC Chassis Aluminum Body on Steel Frame Rear Suspension: Solid Axle with Leaf Springs Front Suspension: Dual A-arm with Coil Springs Weights Design Curb Weight: 3250 lbs Delivered Curb Weight: 3310 lbs 7 Distribution F/R: 55.2/44.8% GVWR: 4450 lbs Max Payload: 940 lbs + 200 lbs driver 1 Performance Goal Payload: 1000 lbs + 200 lbs driver

164

Voltage stabilization system in traction substation of urban electric transport  

Science Journals Connector (OSTI)

The direct current-voltage stabilization system using a high-frequency link in traction substations of urban electric transport based on applying...

S. V. Shapiro; S. F. Muftiev

2011-02-01T23:59:59.000Z

165

High Temperature, High Voltage Fully Integrated Gate Driver Circuit  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

driver circuit, 5-V on- chip voltage regulator, short-circuit protection, undervoltage lockout, bootstrap capacitor, dead time controller and temperature sensor * 0.8-micron,...

166

Triple voltage dc-to-dc converter and method  

DOE Patents (OSTI)

A circuit and method of providing three dc voltage buses and transforming power between a low voltage dc converter and a high voltage dc converter, by coupling a primary dc power circuit and a secondary dc power circuit through an isolation transformer; providing the gating signals to power semiconductor switches in the primary and secondary circuits to control power flow between the primary and secondary circuits and by controlling a phase shift between the primary voltage and the secondary voltage. The primary dc power circuit and the secondary dc power circuit each further comprising at least two tank capacitances arranged in series as a tank leg, at least two resonant switching devices arranged in series with each other and arranged in parallel with the tank leg, and at least one voltage source arranged in parallel with the tank leg and the resonant switching devices, said resonant switching devices including power semiconductor switches that are operated by gating signals. Additional embodiments having a center-tapped battery on the low voltage side and a plurality of modules on both the low voltage side and the high voltage side are also disclosed for the purpose of reducing ripple current and for reducing the size of the components.

Su, Gui-Jia (Knoxville, TN)

2008-08-05T23:59:59.000Z

167

Blood Types  

E-Print Network (OSTI)

Broadcast Transcript: According to the Japanese, you can tell a lot about a person by their blood type: Type A is the farmer, calm and responsible; Type B is the hunter, independent and creative; Type AB is humanistic, ...

Hacker, Randi; Tsutsui, William

2007-03-14T23:59:59.000Z

168

Low voltage ride-through capability improvement of DFIG-based wind turbines under unbalanced voltage dips  

Science Journals Connector (OSTI)

Abstract This paper proposes a competent and effective scheme to enhance the ride-through capability of DFIG-based wind turbines under unbalanced voltage dip conditions. The proposed method is realized through joint use of the rotor-side converter control and a three-phase stator damping resistor (SDR) placed in series with the stator windings. By means of an asymmetrical SDR idea, during the unbalanced voltage dip the SDR resistors are activated only in phase(s) experiencing low voltage. Then, the rotor current is controlled such that no unbalance voltage appears on the stator voltage. The proposed ride-through approach limits the peak values of the rotor inrush current, electromagnetic torque and DFIG transient response at the times of occurrence and clearing the fault. It also suppresses fluctuation of the electromagnetic torque and DFIG transient response appeared during unbalanced voltage dips due to negative sequence component.

Mohsen Rahimi; Mostafa Parniani

2014-01-01T23:59:59.000Z

169

Regional Purchasing  

NLE Websites -- All DOE Office Websites (Extended Search)

Regional Purchasing Regional Purchasing Regional Purchasing Pursuant to Appendix M of Prime Contract No. DE-AC52-06NA25396 between DOE/NNSA and Los Alamos National Security, LLC (LANS), LANS is committed to building a strong supplier base with Northern New Mexico businesses and the local Native American pueblos in the purchases of goods and services. Contact Small Business Office (505) 667-4419 Email We seek out and utilize known Northern New Mexico business as suppliers The Northern New Mexico counties included are Los Alamos Santa Fe Rio Arriba Taos Mora San Miguel Sandoval The eight regional pueblos included are Nambe Ohkay Owingeh (formerly known as San Juan) Picuris Pojoaque San Ildefonso Santa Clara Taos Tesuque When the Laboratory cannot identify regional firms, it will expand its

170

Predicting the Voltage Dependence of Interfacial Electrochemical Processes at Lithium-Intercalated Graphite Edge Planes  

E-Print Network (OSTI)

The applied potential governs lithium-intercalation and electrode passivation reactions in lithium ion batteries, but are challenging to calibrate in condensed phase DFT calculations. In this work, the "anode potential" of charge-neutral lithium-intercalated graphite (LiC(6)) with oxidized edge planes is computed as a function of Li-content n(Li)) at edge planes, using ab initio molecular dynamics (AIMD), a previously introduced Li+ transfer free energy method, and the experimental Li+/Li(s) value as reference. The voltage assignments are corroborated using explicit electron transfer from fluoroethylene carbonate radical anion markers. PF6- is shown to decompose electrochemically (i.e., not just thermally) at low potentials imposed by our voltage calibration technique. We demonstrate that excess electrons reside in localized states-in-the-gap in the organic carbonate liquid region, which is not semiconductor-like (band-state-like) as widely assumed in the literature.

Leung, Kevin

2015-01-01T23:59:59.000Z

171

Simplified VO M&V Protocol Simplified Voltage Optimization (VO)  

E-Print Network (OSTI)

Simplified VO M&V Protocol 1 Simplified Voltage Optimization (VO) Measurement and Verification Protocol 1.0 Introduction 1.1 Purpose The Simplified Voltage Optimization (VO) Measurement and Verification requirements, and measurement and verification formulations are included as part of this Protocol. 1

172

Task Scheduling and Voltage Selection for Energy Minimization  

E-Print Network (OSTI)

system con gurations. 1. INTRODUCTION Energy consumption has become a primary concern in today's ICTask Scheduling and Voltage Selection for Energy Minimization Yumin Zhang Synopsys, Inc. 700 East-phase framework that inte- grates task assignment, ordering and voltage selection VS together to minimize energy

Hu, Xiaobo Sharon

173

IMPACT OF DYNAMIC VOLTAGE SCALING (DVS) ON CIRCUIT OPTIMIZATION  

E-Print Network (OSTI)

and dynamic power, respectively. Both gate sizing and Dual-VT are design-time techniques, which are applied to the circuit at a fixed voltage. On the other hand, DVS is a run-time technique and implies that the circuit will be operating at a different voltage...

Esquit Hernandez, Carlos A.

2010-01-16T23:59:59.000Z

174

REFINED RFP LOOP VOLTAGE CALCULATION J.C. Sprott  

E-Print Network (OSTI)

is the stored magnetic energy, Up is the plasma energy, and 'E is the global energy confinement time, which-of-merit for RFP devices is the loop voltage. Low loop voltage implies high plasma temperature and long energy is smallest if the loop is as close to the outside of the shell and as far from the primary windings

Sprott, Julien Clinton

175

LOW VOLTAGE ANALOG CIRCUITS USING STANDARD CMOS TECHNOLOGY  

E-Print Network (OSTI)

LOW VOLTAGE ANALOG CIRCUITS USING STANDARD CMOS TECHNOLOGY Phillip E. Allen, Benjamin J. Blalock, and Gabriel A. Rincon School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta supply voltages in CMOS integrated circuits. As the channel lengths of CMOS technology decrease

Rincon-Mora, Gabriel A.

176

Measurement of high voltage using Rutherford backscattering spectrometry  

E-Print Network (OSTI)

A novel variation of Rutherford Backscattering Spectrometry (RBS) has been utilized to measure a high voltage collected on an aluminum target by Direct Energy Conversion. The maximum high voltage on the target was measured to be 97.5 kV +/- 2 kV...

Abrego, Celestino Pete

2007-04-25T23:59:59.000Z

177

Nonlinear voltages in multiple-lead coherent conductors  

Science Journals Connector (OSTI)

We use the generalized S-matrix approach to study multiple-lead coherent conductors in the case of finite applied voltages. In this framework we discuss the transverse voltage arising in a four-lead conductor with two symmetric biased leads.

Gordey B. Lesovik and Carlo Presilla

1993-01-15T23:59:59.000Z

178

The Cavendish high-voltage laboratory 1935–39  

Science Journals Connector (OSTI)

...the period covered. Nuclear Transmutation|Cavendish...development of high-voltage nuclear transmutation equipment...experimental work in nuclear physics though he continued...a new high-voltage accelerator therefore fell mainly...doubler circuit with six vacuum rectifiers forming a...

1999-01-01T23:59:59.000Z

179

Definition: Automated Voltage And Var Control | Open Energy Information  

Open Energy Info (EERE)

Voltage And Var Control Voltage And Var Control Jump to: navigation, search Dictionary.png Automated Voltage And Var Control Automated voltage and VAR control requires coordinated operation of reactive power resources such as capacitor banks, voltage regulators, transformer load-tap changers, and distributed generation (DG) with sensors, controls, and communications systems. These devices could operate autonomously in response to local events or in response to signals from a central control system.[1] View on Wikipedia Wikipedia Definition Also Known As Volt-VAR Control (VVC) Related Terms smart grid, Reactive Power References ↑ SmartGrid.gov 'Description of Functions' An i LikeLike UnlikeLike You like this.Sign Up to see what your friends like. nline Glossary Definition Retrieved from

180

Living and Working Safely Around High-Voltage Power Lines.  

SciTech Connect

High-voltage transmission lines can be just as safe as the electrical wiring in the homes--or just as dangerous. The crucial factor is ourselves: they must learn to behave safely around them. This booklet is a basic safety guide for those who live and work around power lines. It deals primarily with nuisance shocks due to induced voltages, and with potential electric shock hazards from contact with high-voltage lines. References on possible long-term biological effects of transmission lines are shown. In preparing this booklet, the Bonneville Power Administration has drawn on more than 50 years of experience with high-voltage transmission. BPA operates one of the world`s largest networks of long-distance, high-voltage lines. This system has more than 400 substations and about 15,000 miles of transmission lines, almost 4,400 miles of which are operated at 500,000 volts.

United States. Bonneville Power Administration.

2001-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Types of Lighting in Commercial Buildings - Lighting Types  

U.S. Energy Information Administration (EIA) Indexed Site

Lighting Types Lighting Types The following are the most widely used types of lighting equipment used in commercial buildings. Characteristics such as energy efficiency, light quality, and lifetime vary by lamp type. Standard Fluorescent A fluorescent lamp consists of a sealed gas-filled tube. The gas in the tube consists of a mixture of low pressure mercury vapor and an inert gas such as argon. The inner surface of the tube has a coating of phosphor powder. When an electrical current is applied to electrodes in the tube, the mercury vapor emits ultraviolet radiation which then causes the phosphor coating to emit visible light (the process is termed fluorescence). A ballast is required to regulate and control the current and voltage. Two types of ballasts are used, magnetic and electronic. Electronic ballasts

182

Regional Inventories  

Gasoline and Diesel Fuel Update (EIA)

5 5 Notes: This year has not started well for gasoline inventories, with inventories being low across regions of the country. The Midwest region (PADD II) had been running lower than most regions, but began to catch up during the last week in April. Gasoline inventories ran about 9% below their 5-year average for this time of year and about 4% below where they were last year. The recent refinery problems in the Midwest, though, could erase some of that recovery. The impacts of Tosco's Wood River refinery and Marathon's St Paul refinery are not fully realized. But inventories were also precariously low along the East Coast (PADD I) and are extremely low in the Rocky Mountain region (PADD IV), although the size of this market mitigates any national impact. While the

183

Electro-optic voltage sensor with Multiple Beam Splitting  

DOE Patents (OSTI)

A miniature electro-optic voltage sensor system capable of accurate operation at high voltages without use of the dedicated voltage dividing hardware. The invention achieves voltage measurement without significant error contributions from neighboring conductors or environmental perturbations. The invention employs a transmitter, a sensor, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor. Within the sensor the beam undergoes the Pockels electro-optic effect. The electro-optic effect produces a modulation of the beam's polarization, which is in turn converted to a pair of independent conversely-amplitude-modulated signals, from which the voltage of the E-field is determined by the signal processor. The use of converse AM signals enables the signal processor to better distinguish signal from noise. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Cornelius, OR); Renak, Todd W. (Idaho Falls, ID); Crawford, Thomas M. (Idaho Falls, ID); Davidson, James R. (Idaho Falls, ID)

2000-01-01T23:59:59.000Z

184

Electro-optic voltage sensor with beam splitting  

DOE Patents (OSTI)

The invention is a miniature electro-optic voltage sensor system capable of accurate operation at high voltages without use of the dedicated voltage dividing hardware typically found in the prior art. The invention achieves voltage measurement without significant error contributions from neighboring conductors or environmental perturbations. The invention employs a transmitter, a sensor, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor. Within the sensor the beam undergoes the Pockels electro-optic effect. The electro-optic effect produces a modulation of the beam's polarization, which is in turn converted to a pair of independent conversely-amplitude-modulated signals, from which the voltage of the E-field is determined by the signal processor. The use of converse AM signals enables the signal processor to better distinguish signal from noise. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Cornelius, OR); Renak, Todd W. (Idaho Falls, ID); Davidson, James R. (Idaho Falls, ID); Crawford, Thomas M. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

185

Panel Session: Optimization Techniques in Voltage Collapse Analysis," IEEE PES Summer Meeting, San Diego, July 14, 1998. Applications of Optimization to Voltage Collapse Analysis  

E-Print Network (OSTI)

Panel Session: Optimization Techniques in Voltage Collapse Analysis," IEEE PES Summer Meeting, San Diego, July 14, 1998. Applications of Optimization to Voltage Collapse Analysis Claudio A. Ca|Thispaper describesseveralapplica- tions of optimization for voltage stability analysis VSA of power systems. Voltage stability prob

Cañizares, Claudio A.

186

Optically triggered high voltage switch network and method for switching a high voltage  

DOE Patents (OSTI)

An optically triggered solid state switch and method for switching a high voltage electrical current. A plurality of solid state switches (350) are connected in series for controlling electrical current flow between a compensation capacitor (112) and ground in a reactive power compensator (50, 50') that monitors the voltage and current flowing through each of three distribution lines (52a, 52b and 52c), which are supplying three-phase power to one or more inductive loads. An optical transmitter (100) controlled by the reactive power compensation system produces light pulses that are conveyed over optical fibers (102) to a switch driver (110') that includes a plurality of series connected optical triger circuits (288). Each of the optical trigger circuits controls a pair of the solid state switches and includes a plurality of series connected resistors (294, 326, 330, and 334) that equalize or balance the potential across the plurality of trigger circuits. The trigger circuits are connected to one of the distribution lines through a trigger capacitor (340). In each switch driver, the light signals activate a phototransistor (300) so that an electrical current flows from one of the energy reservoir capacitors through a pulse transformer (306) in the trigger circuit, producing gate signals that turn on the pair of serially connected solid state switches (350).

El-Sharkawi, Mohamed A. (Renton, WA); Andexler, George (Everett, WA); Silberkleit, Lee I. (Mountlake Terrace, WA)

1993-01-19T23:59:59.000Z

187

High-voltage supply for backward-wave tube  

SciTech Connect

A high-current high-voltage supply for a backward-wave tube is described that uses a generalppurpose semiconductor converter with pulse-width modulation and two-stage regulation. The load current is up to 250 mA for load voltages of from 0.5 to 4.5 kV. The voltage staiblity is less than or equal to 5 x 10/sup -6/. the root-mean-square output ripple is less than or equal to 2 x 10/sup -6// The supply is equipped with high-speed (5 usec) load-breakdown protection.

Bryvkhanov, A.N.; Kosarev, P.M.; Latushkin, S.T.; Yudin, L.I.

1986-04-01T23:59:59.000Z

188

Research to Prevent the Anti-charging Incident of the Voltage Transformer in the Substation  

Science Journals Connector (OSTI)

The voltage transformer of the power system is a device which converts the high voltage of the primary side into the low voltage required by secondary device, and the primary side connects to the primary syste...

Hui-Ying Chen; Zhi-Peng Wang; Mu-Qin Tian

2011-01-01T23:59:59.000Z

189

Eliminate Excessive In-Plant Distribution System Voltage Drops...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

connections-can account for less than 1% to more than 4% of total plant electrical energy consumption. This two-page tip sheet recommends conducting a voltage drop survey and...

190

Optical crystal based devices for current and voltage measurement  

SciTech Connect

A prerequisite for safe, stable operation of an electric power system is accurate, reliable measurement of the system parameters, in particular, current and voltage. Traditionally this has been achieved on High Voltage (HV) systems by expensive, bulky iron-cored current transformers (CTs) and capacitor voltage transformers (VTs). Both these devices are increasingly coming under review in modern power systems due to their cost, safety implications for personnel and surrounding plant if failure occurs, installation time and indeed substation land requirements. This paper describes novel designs for magneto-optic and electro-optic crystal sensors providing potentially separate and combined current and voltage measurement. The results of testing programs are presented and details of the work associated with field trials given.

Cruden, A.; Richardson, Z.J.; McDonald, J.R.; Andonovic, I. [Univ. of Strathclyde (United Kingdom)] [Univ. of Strathclyde (United Kingdom)

1995-07-01T23:59:59.000Z

191

Design & Fabrication of a High-Voltage Photovoltaic Cell  

SciTech Connect

Silicon photovoltaic (PV) cells are alternative energy sources that are important in sustainable power generation. Currently, applications of PV cells are limited by the low output voltage and somewhat low efficiency of such devices. In light of this fact, this project investigates the possibility of fabricating high-voltage PV cells on float-zone silicon wafers having output voltages ranging from 50 V to 2000 V. Three designs with different geometries of diffusion layers were simulated and compared in terms of metal coverage, recombination, built-in potential, and conduction current density. One design was then chosen and optimized to be implemented in the final device design. The results of the simulation serve as a feasibility test for the design concept and provide supportive evidence of the effectiveness of silicon PV cells as high-voltage power supplies.

Felder, Jennifer; /North Carolina State U. /SLAC

2012-09-05T23:59:59.000Z

192

High Voltage Electrolytes for Li-ion Batteries | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Electrolytes for Li-ion Batteries High Voltage Electrolytes for Li-ion Batteries 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and...

193

Long term voltage stability analysis for small disturbances  

E-Print Network (OSTI)

This dissertation attempts to establish an analytical and comprehensive framework to deal with two critical challenges associated with voltage stability analysis: 1. To study the new competitive environment appropriately and give more incentive...

Men, Kun

2009-05-15T23:59:59.000Z

194

Voltage asymmetry at the buses of a combined substation  

Science Journals Connector (OSTI)

The voltage asymmetry at the buses of a combined (ac/dc) substation is calculated by phase method, using Mathcad ... , power may be supplied to a combined substation along a common line from a limited-...

A. G. Pakulin; V. A. Zagorskii; V. F. Put’ko

2013-07-01T23:59:59.000Z

195

Operation of buck regulator with ultra-low input voltage  

E-Print Network (OSTI)

Based on the LTC3621 and LTC3624, the designed buck regulator proposed in this thesis aims to lower the allowed input voltage and increase efficiency compared to the original part without making significant changes to ...

Harris, Cory Angelo

2014-01-01T23:59:59.000Z

196

Voltage Regulator Chip: Power Supplies on a Chip  

SciTech Connect

ADEPT Project: CPES at Virginia Tech is finding ways to save real estate on a computer's motherboard that could be used for other critical functions. Every computer processor today contains a voltage regulator that automatically maintains a constant level of electricity entering the device. These regulators contain bulky components and take up about 30% of a computer's motherboard. CPES at Virginia Tech is developing a voltage regulator that uses semiconductors made of gallium nitride on silicon (GaN-on-Si) and high-frequency soft magnetic material. These materials are integrated on a small, 3D chip that can handle the same amount of power as traditional voltage regulators at 1/10 the size and with improved efficiency. The small size also frees up to 90% of the motherboard space occupied by current voltage regulators.

None

2010-09-01T23:59:59.000Z

197

Reactive Support and Voltage Control Service: Key Issues and Challenges  

E-Print Network (OSTI)

Reactive Support and Voltage Control Service: Key Issues and Challenges George Gross^, Paolo of Illinois at Urbana-Champaign, Urbana, IL 61801, USA, e-mail gross@uiuc.edu ° Dipartimento di Ingegneria

Gross, George

198

Automotive high-voltage electrical system with integrated safeguard  

Science Journals Connector (OSTI)

For several years the use of higher system voltages has been a topic in the automotive industry. Whether for hybrid or conventional vehicles, safeguards are required which protect both the vehicle...

Thomas Flottmann

2007-03-01T23:59:59.000Z

199

Modeling the operating voltage of liquid metal battery cells  

E-Print Network (OSTI)

A one-dimensional, integrative model of the voltage during liquid metal battery operation has been developed to enhance the understanding of performance at the cell level. Two liquid metal batteries were studied: Mg-Sb for ...

Newhouse, Jocelyn Marie

2014-01-01T23:59:59.000Z

200

Voltage Fade, an ABR Deep Dive Project: Status and Outcomes  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Budget * Voltage Fade project * 3,900K Barriers * Calendarcycle life of lithium-ion cells being developed for PHEV and EV batteries that meet or exceed DOEUSABC goals Partners...

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

High Voltage Electrolytes for Li-ion Batteries | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

in Support of 5 V Li-ion Chemistries Vehicle Technologies Office Merit Review 2014: Fluorinated Electrolyte for 5-V Li-Ion Chemistry High Voltage Electrolyte for Lithium Batteries...

202

High-speed low-voltage ultraviolet light source  

Science Journals Connector (OSTI)

A novel quasi-spark gap has been designed and constructed with high-speed and low-spark voltage characteristics. Ultraviolet light generating sparks can be operated at a rate of up to...

Huang, L; Hsu, S C; Kwok, H S

1984-01-01T23:59:59.000Z

203

LM111/LM211/LM311 Voltage Comparator  

E-Print Network (OSTI)

LM111/LM211/LM311 Voltage Comparator 1.0 General Description The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower than devices like the LM106 or LM710A. Both the inputs and the outputs of the LM111, LM211 or the LM311 can be isolated from system ground

Lanterman, Aaron

204

Sinusoidal voltage controlled oscillators using operational transconductance amplifiers  

E-Print Network (OSTI)

SINUSOIDAI. VOLTAGE CONTROLLED OSCILLATORS I. SING OPERATIONAL TRANSCONDUCTANCE AMPLIFIERS A Thesis JAVIFB . IOAQUIN HOYI. K I'ASSANO Suhndtted to the Graduate College ol' 'I'exes A8cM University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1985 Major Subject: Electrical Engineering SINUSOIDAL VOLTAGE CONTROLLED OSCILLATORS USING OPERATIONAI, TRANSCONDUCTANCE AMPLIFIERS A Thesis by JAVIER JOAQUIN HOYLE PASSANO Approved as to style and content by: o...

Hoyle Passano, Javier Joaquin

1985-01-01T23:59:59.000Z

205

Image-line voltage controlled oscillators and grating antennas  

E-Print Network (OSTI)

IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Submitted to the Office of Graduate Studies of Texas ABM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1991 Major Subject: Electrical Engineering IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Approved as to style and content by: Kai Chang (Chair of Committee) Robert D. Nevels...

Kirk, Alexander MacDonald

1991-01-01T23:59:59.000Z

206

Design issues for high voltage converters for ion engines  

SciTech Connect

A design strategy is presented for a power converter for a high voltage ion engine for a spacecraft application. Various design issues such as appropriate topologies and control methods are considered. In this particular instance it was determined that a full bridge converter with phase shift gating and voltage mode control provided an efficient system with a minimum of electromagnetic interference. This system can be implemented in a straightforward manner, and it is relatively easy to protect from faults at the output.

King, R.J.; Stuart, T.A. [Univ. of Toledo, OH (United States)

1995-12-31T23:59:59.000Z

207

Enforcement Policy Statement: Compliance Period for Regional...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

energy conservation standards for residential furnaces, central air conditioners, and heat pumps, including regional standards for different product types in indicated States....

208

Low voltage ride-through of DFIG and brushless DFIG: Similarities and differences  

Science Journals Connector (OSTI)

Abstract The brushless doubly fed induction generator (BDFIG) has been proposed as a viable alternative in wind turbines to the commonly used doubly fed induction generator (DFIG). The BDFIG retains the benefits of the DFIG, i.e. variable speed operation with a partially rated converter, but without the use of brush gear and slip rings, thereby conferring enhanced reliability. As low voltage ride-through (LVRT) performance of the DFIG-based wind turbine is well understood, this paper aims to analyze LVRT behavior of the BDFIG-based wind turbine in a similar way. In order to achieve this goal, the equivalence between their two-axis model parameters is investigated. The variation of flux linkages, back-EMFs and currents of both types of generator are elaborated during three phase voltage dips. Moreover, the structural differences between the two generators, which lead to different equivalent parameters and hence different LVRT capabilities, are investigated. The analytical results are verified via time-domain simulations for medium size wind turbine generators as well as experimental results of a voltage dip on a prototype 250 kVA BDFIG.

S. Tohidi; P. Tavner; R. McMahon; H. Oraee; M.R. Zolghadri; S. Shao; E. Abdi

2014-01-01T23:59:59.000Z

209

Amendment 1 - Dry-type power transformers  

E-Print Network (OSTI)

Specifies requirements for dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 36 kV. The following small and special dry-type transformers are not covered by this standard: -instrument transformers (covered by IEC 60185 and 60186); -transformers for static convertors (covered by IEC 60084, 60119 and 60146). Where IEC standards do not exist for other special transformers, this standard may be applicable as a whole or in part.

International Electrotechnical Commission. Geneva

1986-01-01T23:59:59.000Z

210

Transformateurs de puissance de type sec  

E-Print Network (OSTI)

Specifies requirements for dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 36 kV. The following small and special dry-type transformers are not covered by this standard: -instrument transformers (covered by IEC 60185 and 60186); -transformers for static convertors (covered by IEC 60084, 60119 and 60146). Where IEC standards do not exist for other special transformers, this standard may be applicable as a whole or in part.

International Electrotechnical Commission. Geneva

1982-01-01T23:59:59.000Z

211

High voltage electrical amplifier having a short rise time  

DOE Patents (OSTI)

A circuit, comprising an amplifier and a transformer is disclosed that produces a high power pulse having a fast response time, and that responds to a digital control signal applied through a digital-to-analog converter. The present invention is suitable for driving a component such as an electro-optic modulator with a voltage in the kilovolt range. The circuit is stable at high frequencies and during pulse transients, and its impedance matching circuit matches the load impedance with the output impedance. The preferred embodiment comprises an input stage compatible with high-speed semiconductor components for amplifying the voltage of the input control signal, a buffer for isolating the input stage from the output stage; and a plurality of current amplifiers connected to the buffer. Each current amplifier is connected to a field effect transistor (FET), which switches a high voltage power supply to a transformer which then provides an output terminal for driving a load. The transformer comprises a plurality of transmission lines connected to the FETs and the load. The transformer changes the impedance and voltage of the output. The preferred embodiment also comprises a low voltage power supply for biasing the FETs at or near an operational voltage.

Christie, David J. (Pleasanton, CA); Dallum, Gregory E. (Livermore, CA)

1991-01-01T23:59:59.000Z

212

Centralized wind power plant voltage control with optimal power flow algorithm.  

E-Print Network (OSTI)

??This thesis presents a method of controlling the reactive power injected into a medium-voltage collection system by multiple wind turbine generators such that the voltage… (more)

Kline, Jared Andrew

2011-01-01T23:59:59.000Z

213

Low Voltage Electrostatic Actuation and Displacement Measurement through Resonant Drive Circuit.  

E-Print Network (OSTI)

??An electrostatic actuator driven by conventional voltage control and charge control requires high actuation voltage and suffers from the pull-in phenomenon that limits its operation… (more)

Park, Sangtak

2011-01-01T23:59:59.000Z

214

Integrated, Low Voltage, DynamicallyIntegrated, Low Voltage, Dynamically Adaptive BuckAdaptive Buck--Boost ConverterBoost Converter  

E-Print Network (OSTI)

Improvement in battery life Low voltage Single cell operation (Li-ion/NiCd/NiMH/Fuel Cell) Integrated Linearity degradation #12;55Georgia Tech Analog Consortium Biranchinath Sahu School of Electrical

Rincon-Mora, Gabriel A.

215

High voltage power supplies for the neutral beam injectors of the stellarator TJ-II  

Science Journals Connector (OSTI)

Neutral beam injection will be available for the second experimental phase of TJ-II. Two injectors, set in co-counter configuration, will inject into the plasma two 40 keV H0 beams, each of up to 1 MW. The two high voltage power supplies to feed the acceleration grids of the injectors, described in this paper, are of the transformer–rectifier type, taking their primary energy from a pulsed flywheel generator, and are coupled to the acceleration grids through a switching device. This environment effectively sets the main operation limits and protection requirements of the power supplies.

J Alonso; M Liniers; L Mart??nez Laso; E Jauregi; C Luc??a; F Valcárcel

2001-01-01T23:59:59.000Z

216

Type Fusion  

Science Journals Connector (OSTI)

Fusion is an indispensable tool in the arsenal ... Less well-known, but equally valuable is type fusion, which states conditions for fusing an application ... algebra. We provide a novel proof of type fusion base...

Ralf Hinze

2011-01-01T23:59:59.000Z

217

CAPITAL REGION  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

t 09/20/07 15:28 FAX 301 903 4656 t 09/20/07 15:28 FAX 301 903 4656 CAPITAL REGION 0 j002 SDOE F 1325.8 (8-89) EFG (0790) Energy United States Government Department of Energy Memorandum DATE. September 18, 2007 Audit Report No.: OAS-L-07-23 REPLY TO: IG-34 (A07TG036) SUBJECT: Evaluation of "The Federal Energy Regulatory Commission's Cyber Security Program-2007" TO: Chairman, Federal Energy Regulatory Commission The purpose of this report is to inform you of the results o Four evaluation of the Federal Energy Regulatory Commission's (Commission) cyber security program. The evaluation was initiated in May 2007, and our fieldwork was conducted through September 2007. Our methodology is described in the attachment to this report. . INTRODUCTION AND OBJECTIVE The Commission reports that it is constantly improving thl stability, reliability, and

218

Minimization of voltage deviation and power losses in power networks using Pareto optimization methods  

Science Journals Connector (OSTI)

Voltage regulation is an important task in electrical engineering for controlling node voltages in a power network. A widely used solution for the problem of voltage regulation is based on adjusting the taps in under load tap changers (ULTCs) power transformers ... Keywords: Multi-objective optimization, Power distribution network, Power losses, Under load tap changers, Voltage regulation

Francisco G. Montoya; Raúl Baños; Consolación Gil; Antonio Espín; Alfredo Alcayde; Julio Gómez

2010-08-01T23:59:59.000Z

219

Requirements for a Standard Test to Rate the Durability of PV Modules at System Voltage (Presentation)  

SciTech Connect

Degradation modes in photovoltaic modules under system bias voltage stress are described and classified.

Hacke, P.; Terwilliger, K.; Glick, S.; Kempe, M.; Kurtz, S.; Bennett, I.; Kloos, M.

2011-02-01T23:59:59.000Z

220

Summaries of Addresses of Presidents of Sections: High-Voltage Insulation  

Science Journals Connector (OSTI)

... subject of his presidential address to Section A (Mathematics and Physics) *'High-voltage Insulation".

1963-08-31T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Elevated voltage level I.sub.DDQ failure testing of integrated circuits  

DOE Patents (OSTI)

Burn in testing of static CMOS IC's is eliminated by I.sub.DDQ testing at elevated voltage levels. These voltage levels are at least 25% higher than the normal operating voltage for the IC but are below voltage levels that would cause damage to the chip.

Righter, Alan W. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

222

Elevated voltage level I{sub DDQ} failure testing of integrated circuits  

DOE Patents (OSTI)

Burn in testing of static CMOS IC`s is eliminated by I{sub DDQ} testing at elevated voltage levels. These voltage levels are at least 25% higher than the normal operating voltage for the IC but are below voltage levels that would cause damage to the chip. 4 figs.

Righter, A.W.

1996-05-21T23:59:59.000Z

223

Graz University of Technology Institute of High Voltage Engineering and System Performance  

E-Print Network (OSTI)

.hspt@tugraz.at u www.hspt.tugraz.at Institute of High Voltage Engineering and System Performance Test Laboratory systems Test of insulators, fittings and accessories Testing of high voltage equipment Impulse voltage and current tests On-site-test of medium voltage cables Electrical methods in environmental technology

224

Characterization of a voltage-dependent L-type calcium channel from rabbit and turtle brain  

Science Journals Connector (OSTI)

The binding of [3H]nitrendipine to membrane preparation from turtle and rabbit brain was studied. A single...3H]nitrendipine binding sites was detected in both species. [3H]nitrendipine bound with high affinity t...

B. Costa; L. Giusti; C. Martini; A. Lucacchini

1996-05-01T23:59:59.000Z

225

Experiment Hazard Class 13.0 - High Voltage  

NLE Websites -- All DOE Office Websites (Extended Search)

3.0 - High Voltage 3.0 - High Voltage Applicability This hazard classification applies to all experiments involving the use of High Voltage Equipment. Other hazard classifications and their associated hazard controls may also apply to experiments in this hazard class. The inspection of electric equipment is covered under the APS Policy For User Electric Equipment Inspections. NOTE: Unless required Argonne training has been completed, users are not authorized to perform electrical work. Experiment Category All Hazard Class 13 experiments are categorized as medium risk experiments. Experiment Hazard Control Verification Statements Engineered Controls - Determined by review and results of a DEEI inspection of the equipment. Procedural Controls - Determined by review and results of a DEEI

226

Voltage controlled stand-alone microhydro induction generator system  

Science Journals Connector (OSTI)

The paper discusses simulated control cases of the wound rotor self-excited induction generator WRSEIG. The generator external controller is designed to regulate the output voltage and frequency for constant or variable speed operation of the prime mover and has the inherent capability of protecting the load from short circuit, which permits voltage collapse under heavy loads. WRSEIG is self-excited using one set of excitation capacitance connected across the generator stator side. At the rotor side, a PWM controlled resistor is connected to the rotor windings through the rotating slips and act as a slip power controller. The controller can be configured to regulate the voltage as the speed or the load changes. The presented system has the capability to generate good quality AC power source with minimum controlling elements and can operate under constant or adjustable prime mover speed that suits many microhydro electricity-generating plants.

K.A. Nigim

2005-01-01T23:59:59.000Z

227

Voltage Impacts of Utility-Scale Distributed Wind  

SciTech Connect

Although most utility-scale wind turbines in the United States are added at the transmission level in large wind power plants, distributed wind power offers an alternative that could increase the overall wind power penetration without the need for additional transmission. This report examines the distribution feeder-level voltage issues that can arise when adding utility-scale wind turbines to the distribution system. Four of the Pacific Northwest National Laboratory taxonomy feeders were examined in detail to study the voltage issues associated with adding wind turbines at different distances from the sub-station. General rules relating feeder resistance up to the point of turbine interconnection to the expected maximum voltage change levels were developed. Additional analysis examined line and transformer overvoltage conditions.

Allen, A.

2014-09-01T23:59:59.000Z

228

Voltage Control Devices on the IEEE 8500 Node Test Feeder  

SciTech Connect

The IEEE Test Cases provide researchers with distribution system models that can be used to validate new analytic methods. The newest of these models is the 8500-node test feeder which contains multiple devices for voltage control. In addition to a substation regulator there are multiple inline regulators as well as capacitor banks. This paper will discuss the detail in which voltage control devises should be modeled when examining large distribution systems. This discussion will include issues associated with power flow analysis for a single time step as well as for time series analysis.

Schneider, Kevin P.; Fuller, Jason C.

2010-01-06T23:59:59.000Z

229

Reduction of interference on substation low voltage wiring  

SciTech Connect

This paper describes test results and mitigation methods of electromagnetic interference (EMI) on control and low voltage circuits in substations caused by air disconnect switch operation. The tests are focused on a comparison between unshielded and shielded circuits from capacitively coupled voltage transformers (CCVT) and other equipment circuits in the vicinity. New test data are presented comparing unshielded and shielded cables and transient currents on all connections to the CCVT including the pedestal and ground strap. The paper gives a practical and understandable explanation of the causes of EMI in substations and how shielded cable and parallel ground conductors reduce interference. Design guidelines are listed in the Conclusion.

Gavazza, R.J. [Pacific Gas and Electric Co., San Francisco, CA (United States)] [Pacific Gas and Electric Co., San Francisco, CA (United States); Wiggins, C.M. [Carl M. Wiggins and Associates, Friendswood, TX (United States)] [Carl M. Wiggins and Associates, Friendswood, TX (United States)

1996-07-01T23:59:59.000Z

230

Human Immunodeficiency Virus Type 1 Gag Polyprotein Multimerization Requires the Nucleocapsid Domain and RNA and Is Promoted by the Capsid-Dimer Interface and the Basic Region of Matrix Protein  

Science Journals Connector (OSTI)

...Analysis of the three-dimensional structure of a protein fragment...identified a hydrophobic dimer interface (). In the context of an...wild-type provirus, the dimer interface mutants are associated with...the affinity of the dimer interface is not very high (), and...

Mark T. Burniston; Andrea Cimarelli; John Colgan; Sean P. Curtis; Jeremy Luban

1999-10-01T23:59:59.000Z

231

Conditions for Capacitor Voltage Regulation in a Five-Level Cascade Multilevel Inverter: Application to Voltage-Boost in a PM Drive  

E-Print Network (OSTI)

Conditions for Capacitor Voltage Regulation in a Five-Level Cascade Multilevel Inverter Abstract-- A cascade multilevel inverter is a power electronic device built to synthesize a desired AC voltage from several levels of DC voltages. Such inverters have been the subject of research in the last

Tolbert, Leon M.

232

Low Beam Voltage, 10 MW, L-Band Cluster Klystron  

SciTech Connect

Conceptual design of a multi-beam klystron (MBK) for possible ILC and Project X applications is presented. The chief distinction between this MBK design and existing 10-MW MBK's is the low operating voltage of 60 kV. There are at least four compelling reasons that justify development at this time of a low-voltage MBK, namely (1) no pulse transformer; (2) no oil tank for high-voltage components and for the tube socket; (3) no high-voltage cables; and (4) modulator would be a compact 60-kV IGBT switching circuit. The proposed klystron consists of four clusters containing six beams each. The tube has common input and output cavities for all 24 beams, and individual gain cavities for each cluster. A closely related optional configuration, also for a 10 MW tube, would involve four totally independent cavity clusters with four independent input cavities and four 2.5 MW output ports, all within a common magnetic circuit. This option has appeal because the output waveguides would not require a controlled atmosphere, and because it would be easier to achieve phase and amplitude stability as required in individual SC accelerator cavities.

Teryaev, V.; /Novosibirsk, IYF; Yakovlev, V.P.; /Fermilab; Kazakov, S.; /KEK, Tsukuba; Hirshfield, J.L.; /Yale U. /Omega-P, New Haven

2009-05-01T23:59:59.000Z

233

Power Grid Voltage Integrity Verification Department of ECE  

E-Print Network (OSTI)

Power Grid Voltage Integrity Verification Maha Nizam Department of ECE University of Toronto devgan@magma-da.com ABSTRACT Full-chip verification requires one to check if the power grid is safe, i of the circuit attached to the grid, thereby precluding early verification of the grid. We propose a power grid

Najm, Farid N.

234

Voltage Regulation through Smart Utilization of Potential Reactive Power Resources  

Science Journals Connector (OSTI)

The introduction of demand response concept, in addition to increment of penetration of distributed generation (DG) based on renewable energies, make opportunities for the novel control schemes to be integrated in power system on a smart grid framework. ... Keywords: Demand response, distributed generation, reactive power, renewable energy, smart grid, voltage control

H. Kazari; A. Abbaspour-Tehrani Fard; A. S. Dobakhshari; A. M. Ranjbar

2011-11-01T23:59:59.000Z

235

ORIGINAL ARTICLES Induced Transmembrane Voltage and Its Correlation  

E-Print Network (OSTI)

to investigate the correlation between DWm and molecular transport through an elec- troporated membrane to a voltage (electric potential difference) caused by a system of ion pumps and channels in the membrane, or electropermea- bilization, and permits transmembrane transport of mole- cules for which an intact membrane

Ljubljana, University of

236

Topical Review Voltage Dependence of the Na/K Pump  

E-Print Network (OSTI)

or ``ion well'' hy- pothesis. There are only two ways that net transport can be voltage dependent. Either of the external Na+ and K+ bind- ing sites within the membrane field. This access channel or ``ion well produced by applying a blocking Key words: Na,K-ATPase -- Membrane potential -- Access channel -- Ion well

Gadsby, David

237

Current isolating epitaxial buffer layers for high voltage photodiode array  

DOE Patents (OSTI)

An array of photodiodes in series on a common semi-insulating substrate has a non-conductive buffer layer between the photodiodes and the semi-insulating substrate. The buffer layer reduces current injection leakage between the photodiodes of the array and allows optical energy to be converted to high voltage electrical energy.

Morse, Jeffrey D. (Martinez, CA); Cooper, Gregory A. (Pleasant Hill, CA)

2002-01-01T23:59:59.000Z

238

Load Balancing in Wireless Sensor Networks using Kirchhoff's Voltage Law  

E-Print Network (OSTI)

Load Balancing in Wireless Sensor Networks using Kirchhoff's Voltage Law Stavros Toumpis Electrical balancing in wireless networks with a single class of traffic, focusing our attention on an important example, i.e., Wireless Sensor Networks. The analysis is based on the Wireless Minimum Cost Problem

Toumpis, Stavros

239

Power and Voltage Smooth Control of Doubly Fed Induction Generator  

Science Journals Connector (OSTI)

Doubly-fed induction generator (DFIG) is the leading in wind power technology currently. In this paper, decoupling control of DFIG is studied and a new energy storage device is used in the smooth control of DFIG system's power and voltage. This new method ... Keywords: Doubly fed induction generator, Energy storage device, Decoupling control

An-Ren Ma; Cai-Xia Wang; Zhi-Wen Zhou; Tao Wu

2012-07-01T23:59:59.000Z

240

SVC Voltage Regulator Based on Fractional Order PID  

Science Journals Connector (OSTI)

Contradiction exist between rapid and smooth in the dynamic adjustment process of SVC, however, Fractional order PID controller has two degrees of freedom more than the integer order PID controller, and it has better control performance. This article ... Keywords: SVC, Fractional order PID, Voltage regulator, Oustaloup

Manyu Liu; Huaying Dong; Guishu Liang

2012-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Way to reduce arc voltage losses in hybrid thermionic converters  

SciTech Connect

Experimental results are reported concerning the output and emission characteristics of the arc and hybrid regimes in a plane-parallel thermionic converter with Pt--Zr--O electrode pair. It is shown that arc voltage losses can be reduced to values below those obtainable in ordinary arc thermionic converters.

Tskhakaya, V.K.; Yarygin, V.I.

1982-03-01T23:59:59.000Z

242

Field Optimization of Three Dimensional High Voltage C. Trinitis  

E-Print Network (OSTI)

Field Optimization of Three Dimensional High Voltage Equipment C. Trinitis Lehrstuhl f The goal of finding an optimal electric field strength distribution for arbitrary three di­ mensional­ cal optimization algorithm. The package ob­ tained from these three components is then able

Stamatakis, Alexandros

243

High voltage gas insulated transmission line with continuous particle trapping  

DOE Patents (OSTI)

This invention provides a novel high voltage gas insulated transmission line utilizing insulating supports spaced at intervals with snap-in means for supporting a continuous trapping apparatus and said trapping apparatus having perforations and cutouts to facilitate trapping of contaminating particles and system flexibility.

Cookson, Alan H. (Pittsburgh, PA); Dale, Steinar J. (Monroeville, PA)

1983-01-01T23:59:59.000Z

244

Bias current influence on the characteristic of the magnetic-controlled switcher type fault current limiter  

Science Journals Connector (OSTI)

A novel magnetic-controlled switcher type fault current limiter (FCL) for high voltage electric network is presented. The current limiting principle of the FCL and the bias current influence on the characteristic...

Yan-xia Pan ???; Jian-guo Jiang ???

2009-06-01T23:59:59.000Z

245

Melanin Types  

NLE Websites -- All DOE Office Websites (Extended Search)

Melanin Types Melanin Types Name: Irfan Location: N/A Country: N/A Date: N/A Question: What are different types of melanins? And what are the functions of these types? Replies: Hi Irfan! Melanin is a dark compound or better a photoprotective pigment. Its major role in the skin is to absorb the ultraviolet (UV) light that comes from the sun so the skin is not damaged. Sun exposure usually produces a tan at the skin that represents an increase of melanin pigment in the skin. Melanin is important also in other areas of the body, as the eye and the brain., but it is not completely understood what the melanin pigment does in these areas. Melanin forms a special cell called melanocyte. This cell is found in the skin, in the hair follicle, and in the iris and retina of the eye.

246

Spatial Data Types: Conceptual Foundation for  

E-Print Network (OSTI)

Spatial Data Types: Conceptual Foundation for the Design and Implementation of Spatial Database markus.schneider@fernuni-hagen.de #12;Markus Schneider, Tutorial "Spatial Data Types" 2 Abstract Spatial are usually called spatial data types, such as point, line, and region but also include more complex types

Güting, Ralf Hartmut

247

Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum  

DOE Patents (OSTI)

A method and apparatus for focusing dispersed charged particles. More specifically, a series of elements within a region maintained at a pressure between 10.sup.-1 millibar and 1 bar, each having successively larger apertures forming an ion funnel, wherein RF voltages are applied to the elements so that the RF voltage on any element has phase, amplitude and frequency necessary to define a confinement zone for charged particles of appropriate charge and mass in the interior of the ion funnel, wherein the confinement zone has an acceptance region and an emmitance region and where the acceptance region area is larger than the emmitance region area.

Smith, Richard D. (Richland, WA); Shaffer, Scott A. (Seattle, WA)

2000-01-01T23:59:59.000Z

248

Region 9: Pacific Rim Region, Regional Sustainability Plan  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

REGION 9: PACIFIC RIM REGION REGION 9: PACIFIC RIM REGION Regional Sustainability Plan Presented by Ruth Cox Region 9 Regional Administrator Federal Utility Partnership Working Group (FUPWG) May 22 nd , 2013 REGION 9 INFORMATION MANAGE Federal space  36 million RSF in Region Nine * 173 owned buildings, 955 leased buildings * 100,000 Federal workers housed DESIGN & CONSTRUCT new Federal buildings $1.4 billion in FY12 capital construction projects $318 million in FY13 - Los Angeles Courthouse project PROVIDE PROCUREMENT LEADERSHIP across the Federal government  $1.24 billion in total GSA Schedule sales in FY12  $468 million to small businesses  34,000 fleet vehicles, 53% of which are Alternative Fuel Vehicles Pacific Rim Profile - CA, AZ, NV, HI

249

Lake Region State College | Open Energy Information  

Open Energy Info (EERE)

College College Jump to: navigation, search Name Lake Region State College Facility Lake Region State College Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Lake Region State College Developer Lake Region State College Energy Purchaser Lake Region State College Location Devils Lake ND Coordinates 48.166071°, -98.864529° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":48.166071,"lon":-98.864529,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

250

High-voltage supply for neutron tubes in well-logging applications  

DOE Patents (OSTI)

A high voltage supply is provided for a neutron tube used in well logging. The biased pulse supply of the invention combines DC and full pulse techniques and produces a target voltage comprising a substantial negative DC bias component on which is superimposed a pulse whose negative peak provides the desired negative voltage level for the neutron tube. The target voltage is preferably generated using voltage doubling techniques and employing a voltage source which generates bipolar pulse pairs having an amplitude corresponding to the DC bias level.

Humphreys, D.R.

1982-09-15T23:59:59.000Z

251

State & Regional Resources  

Energy.gov (U.S. Department of Energy (DOE))

The Bioenergy Technologies Office partners with the National Biomass State and Regional Partnerships' five regional organizations that provide leadership in their regions with regard to policies...

252

CaV1.1: The atypical prototypical voltage-gated Ca2 + channel  

Science Journals Connector (OSTI)

CaV1.1 is the prototype for the other nine known CaV channel isoforms, yet it has functional properties that make it truly atypical of this group. Specifically, CaV1.1 is expressed solely in skeletal muscle where it serves multiple purposes; it is the voltage sensor for excitation–contraction coupling and it is an L-type Ca2 + channel which contributes to a form of activity-dependent Ca2 + entry that has been termed Excitation-coupled Ca2+ entry. The ability of CaV1.1 to serve as voltage-sensor for excitation–contraction coupling appears to be unique among CaV channels, whereas the physiological role of its more conventional function as a Ca2 + channel has been a matter of uncertainty for nearly 50 years. In this chapter, we discuss how CaV1.1 supports excitation–contraction coupling, the possible relevance of Ca2 + entry through CaV1.1 and how alterations of CaV1.1 function can have pathophysiological consequences. This article is part of a Special Issue entitled: Calcium channels.

Roger A. Bannister; Kurt G. Beam

2013-01-01T23:59:59.000Z

253

Regional Summary Pacific Region Management Context  

E-Print Network (OSTI)

, for the Eastern Pacific Ocean, and the Western and Central Pacific Fishery Commission, for the Western PacificRegional Summary Pacific Region Management Context The Pacific Region includes California, Oregon, and Washington. Federal fisheries in this region are managed by the Pacific Fishery Management Council (PFMC

254

Guidelines for Working at Voltages < 240 Volts  

NLE Websites -- All DOE Office Websites (Extended Search)

Guidelines for Working at Voltages < 240 Volts Guidelines for Working at Voltages < 240 Volts February 4, 2005---DRAFT NOTE: Working hot is a LAST ALTERNATIVE. Electrical hot work is defined as: Working on or near exposed conducting parts that are or might become energized at 50V or more. Refer to Electrical Safety Flowchart for Working On or Near Live Parts. Engineered methods to prevent exposed sources of 50V and greater are to be implemented wherever practical. Only QUALIFIED PERSONNEL {as defined in NFPA 70E Article 110.6(D) 2004 edition} as authorized by the CAT/supervisor/division can perform such work. Refer to Qualified Electrical Worker Flow Chart. Training requirements: ES&H 114 (LOTO) / ES&H 375 (NFPA 70E) / ES&H 371 (electrical worker) - Observe Electrical Safe Work Practices. Refer to

255

Optimal Distributed Voltage Regulation in Power Distribution Networks  

E-Print Network (OSTI)

In this paper, we address the problem of voltage regulation in power distribution networks with deep-penetration of distributed energy resources (DERs), e.g., renewable-based generation, and storage-capable loads such as plug-in hybrid electric vehicles. We cast the problem as an optimization program, where the objective is to minimize the losses in the network subject to constraints on bus voltage magnitudes, limits on active and reactive power injections, transmission line thermal limits and losses. We provide sufficient conditions under which the optimization problem can be solved via its convex relaxation. Using data from existing networks, we show that the conditions are expected to be satisfied by most networks. We also provide an efficient distributed algorithm to solve the problem. The algorithm is asynchronous, with a communication topology that is the same as the electrical network topology. We illustrate the algorithm's performance in the IEEE 34-bus and the 123-bus feeder test systems.

Lam, Albert Y S; Dominguez-Garcia, Alejandro; Tse, David

2012-01-01T23:59:59.000Z

256

Analysis of Lightning-induced Voltages in Overhead Transmission Lines  

Science Journals Connector (OSTI)

Abstract In this work we study the coupling of lightning induced voltages in Overhead Transmission Lines .The study is led directly in the time domain with hold in account the effect of a finite conductivity of the soil. After discretization by the method so-called FDTD (Finite Difference Time Domain) of the lines equations excited by a lightning wave and the application in every node of the network in current and voltage, we deduct a equations system, of which the resolution permits us to deduct the induced electric quantities in every node of the network. In order to confirm our theoretical work, we present a set of applications that allows validating this study.

Mostefa. Boumaiza; Djamel. Labed

2014-01-01T23:59:59.000Z

257

Elimination of GeO(2) And Ge(3)N(4) Interfacial Transition Regions And Defects at N-Type Ge Interfaces: a Pathway for Formation of N-MOS Devices on Ge Substrates  

SciTech Connect

The contribution from relatively low-K SiON interfacial transition regions (ITRs) between Si and transition metal (TM) gate dielectrics places a significant limitation on equivalent oxide thickness (EOT) scaling for Si complementary metal-oxide-semiconductor (CMOS) devices. This limitation is equally significant and limiting for Ge CMOS devices. Low-K Ge-based ITRs in Ge devices have also been shown to limit performance and reliability, particular for n-MOS field effect transistors. This article identifies the source of significant electron trapping at interfaces between n-Ge or inverted p-Ge, and Ge oxide, nitride and oxynitride ITRs. This is shown to be an interfacial band alignment issue in which native Ge ITRs have conduction band offset energies smaller than those of TM dielectrics, and trap electrons for negative Ge substrate bias. This article also describes a novel remote plasma processing approach for effectively eliminating any significant native Ge ITRs and using a plasma-processing/annealing process sequence for bonding TM gate dielectrics directly to the Ge substrate surface.

Lucovsky, G.; Lee, S.; Long, J.P.; Seo, H.; Luning, J.

2009-05-19T23:59:59.000Z

258

Distribution capacitor automation that controls voltage and saves energy  

SciTech Connect

The Electric Distribution Business Line of Southern California Edison Company (SCE) has begun a program to improve the distribution system operations and electrical efficiency. The program, called the Distribution System Efficiency Enhancement Program (DSEEP), consists of five principal projects: Automated Switching, Circuit Lock-Out Alarming, Substation Monitoring and Control, Outage Management, and Distribution Capacitor Automation Project (DCAP). DCAP is the largest and most sophisticated of the projects being implemented. The project takes advantage of fine-tuning customer voltages for conservation voltage regulation (CVR) benefits as well as minimizes line losses by reducing unnecessary reactive power flow. DCAP can also help to increase transmission line and substation capacity by improving system power factor. The DCAP system takes advantage of the distributed processing capability of meters, capacitor controllers, radios, and substation processors. DCAP uses two-way packet radios and new electronic meters that read real-time customer voltages as well as energy consumption. The radios transmit customer meter voltage information and capacitor status to substation processors, where a control algorithm runs to determine which capacitors should be turned on or off. The objective of DCAP is to reduce over-all net energy transfer from the substation to the customer and meet system VAR requirements. SCE has tested the system on 66 circuit capacitors (including 3 substation capacitors) on 18 circuits served from two substations. The positive results of the DCAP demonstrations has led to an aggressive roll-out plan for system-wide implementation of automating over 7600 switched capacitors by year-end 1995.

Williams, B.R.

1994-12-31T23:59:59.000Z

259

Specific T-type calcium channel isoforms are associated with distinct burst phenotypes  

E-Print Network (OSTI)

timing loop important for cerebellar functions (14). In Purkinje cells T-type calcium channels contributeSpecific T-type calcium channel isoforms are associated with distinct burst phenotypes in deep-type calcium channels are thought to transform neuronal output to a burst mode by generating low voltage

Turner, Ray

260

Real time voltage control using emergency demand response in distribution system by integrating advanced metering infrastructure  

Science Journals Connector (OSTI)

In this paper an analytical study is reported to demonstrate the effects of demand response on distribution network voltages profile. Also a new approach for real time voltage control is proposed which uses emergency demand response program aiming at maintaining voltage profile in an acceptable range with minimum cost. This approach will be active in emergency conditions where in real time the voltages in some nodes leave their permissible ranges. These emergency conditions are Distributed Generation (DG) units and lines outage and unpredictable demand and renewable generations' fluctuations. The proposed approach does not need the load and renewable generation forecast data to regulate voltage. To verify the effectiveness and robustness of the proposed control scheme the proposed voltage control scheme is tested on a typical distribution network. The simulation results show the effectiveness and capability of the proposed real time voltage control model to maintain smart distribution network voltage in specified ranges in both normal and emergency conditions.

Alireza Zakariazadeh; Shahram Jadid

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Demand Response by Decentralized Device Control Based on Voltage Level  

Science Journals Connector (OSTI)

This paper introduces a distributed, self-organizing approach to load control based on voltage measurement. A local voltage measurement defines a Level of Service (LoS), which is balanced with the neighboring ...

Wilfried Elmenreich; Stefan Schuster

2014-01-01T23:59:59.000Z

262

Demand Side Management using VOLTAGE / DISTRIBUTION OPTIMIZATION Quality improvement & Peak reduction  

Science Journals Connector (OSTI)

In order to improve the quality of the electrical energy delivered at consumer households a Voltage Optimization Device (VOD) is introduced in each household. This device controls the output voltage accurately at...

N. H. M. Hofmeester; C. J. van de Water

1994-01-01T23:59:59.000Z

263

E-Print Network 3.0 - ac voltage standard Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

"volts, AC"), the "secondary" voltage is roughly 6 VAC. We shall use the "Universal Transformer... :" conversion of AC to DC You can use a diode to convert the AC voltage of the...

264

E-Print Network 3.0 - applied voltages ii Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

dc-link voltage error is applied to the fun... --In this paper, a new hybrid active power filter topology is presented. A higher-voltage, low-switching fre... - quency...

265

Advanced Gate Drive for the SNS High Voltage Converter Modulator  

SciTech Connect

SLAC National Accelerator Laboratory is developing a next generation H-bridge switch plate [1], a critical component of the SNS High Voltage Converter Modulator [2]. As part of that effort, a new IGBT gate driver has been developed. The drivers are an integral part of the switch plate, which are essential to ensuring fault-tolerant, high-performance operation of the modulator. The redesigned driver improves upon the existing gate drive in several ways. The new gate driver has improved fault detection and suppression capabilities; suppression of shoot-through and over-voltage conditions, monitoring of dI/dt and Vce(sat) for fast over-current detection and suppression, and redundant power isolation are some of the added features. In addition, triggering insertion delay is reduced by a factor of four compared to the existing driver. This paper details the design and performance of the new IGBT gate driver. A simplified schematic and description of the construction are included. The operation of the fast over-current detection circuits, active IGBT over-voltage protection circuit, shoot-through prevention circuitry, and control power isolation breakdown detection circuit are discussed.

Nguyen, M.N.; Burkhart, C.; Kemp, M.A.; /SLAC; Anderson, D.E.; /Oak Ridge

2009-05-07T23:59:59.000Z

266

Linear inductive voltage adders (IVA) for advanced hydrodynamic radiography  

SciTech Connect

The electron beam which drifts through the multiple cavities of conventional induction linacs (LIA) is replaced in an IVA by a cylindrical metal conductor which extends along the entire length of the device and effectuates the addition of the accelerator cavity voltages. In the approach to radiography, the linear inductive voltage adder drives a magnetically immersed electron diode with a millimeter diameter cathode electrode and a planar anode/bremsstrahlung converter. Both anode and cathode electrodes are immersed in a strong (15--50 T) solenoidal magnetic field. The electron beam cross section is approximately of the same size as the cathode needle and generates a similar size, very intense x-ray beam when it strikes the anode converter. An IVA driven diode can produce electron beams of equal size and energy as a LIA but with much higher currents (40--50 kA versus 4--5 kA), simpler hardware and thus lower cost. The authors present here first experimental validations of the technology utilizing HERMES 3 and SABRE IVA accelerators. The electron beam voltage and current were respectively of the order of 10 MV and 40 kA. X-ray doses of up to 1 kR {at} 1 m and spot sizes as small as 1.7 mm (at 200 R doses) were measured.

Mazarakis, M.G.; Boyes, J.D.; Johnson, D.L. [and others

1998-09-01T23:59:59.000Z

267

Thermally-induced voltage alteration for integrated circuit analysis  

DOE Patents (OSTI)

A thermally-induced voltage alteration (TIVA) apparatus and method are disclosed for analyzing an integrated circuit (IC) either from a device side of the IC or through the IC substrate to locate any open-circuit or short-circuit defects therein. The TIVA apparatus uses constant-current biasing of the IC while scanning a focused laser beam over electrical conductors (i.e. a patterned metallization) in the IC to produce localized heating of the conductors. This localized heating produces a thermoelectric potential due to the Seebeck effect in any conductors with open-circuit defects and a resistance change in any conductors with short-circuit defects, both of which alter the power demand by the IC and thereby change the voltage of a source or power supply providing the constant-current biasing. By measuring the change in the supply voltage and the position of the focused and scanned laser beam over time, any open-circuit or short-circuit defects in the IC can be located and imaged. The TIVA apparatus can be formed in part from a scanning optical microscope, and has applications for qualification testing or failure analysis of ICs.

Cole, Jr., Edward I. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

268

Fiber optic current monitor for high-voltage applications  

DOE Patents (OSTI)

A current monitor which derives its power from the conductor being measured for bidirectionally measuring the magnitude of current (from DC to above 50 khz) flowing through a conductor across which a relatively high level DC voltage is applied, includes a pair of identical transmitter modules connected in opposite polarity to one another in series with the conductor being monitored, for producing from one module a first light signal having an intensity directly proportional to the magnitude of current flowing in one direction through the conductor during one period of time, and from the other module a second light signal having an intensity directly proportional to the magnitude of current flowing in the opposite direction through the conductor during another period of time, and a receiver located in a safe area remote from the high voltage area for receiving the first and second light signals, and converting the same to first and second voltage signals having levels indicative of the magnitude of current being measured at a given time.

Renda, George F. (Plainsboro, NJ)

1992-01-01T23:59:59.000Z

269

An Open Question about Dependency of Life Time of Hardware Components and Dynamic Voltage Scaling  

E-Print Network (OSTI)

Open question about Dependency of Life Time of Hardware Components and Dynamic Voltage Scaling (A primary idea)

Jaberi, Nasrin

2012-01-01T23:59:59.000Z

270

Limiting discharge voltage of a capacitive energy store in a subway car  

Science Journals Connector (OSTI)

A method is proposed for calculating the limiting discharge voltage of a capacitive energy store in a subway car.

G. G. Ryabtsev; I. A. Ermakov

2012-12-01T23:59:59.000Z

271

Radio-Frequency Interference (RFI) From Extra-High-Voltage (EHV) Transmission Lines  

E-Print Network (OSTI)

discharges are a design issue. Extra-high-voltage (EHV) transmission lines have operating voltages of 345 kV building a 345-kV transmission line from Red Hill, NM to Deming, NM which would run east along US60 to its with respect to radio noise: (1) lines with voltages below 70 kV and (2) lines with voltages above 110 kV

Ellingson, Steven W.

272

High open circuit voltages of solar cells based on quantum dot and dye hybrid-sensitization  

SciTech Connect

A type of solar cell based on quantum dot (QD) and dye hybrid-sensitized mesoporous TiO{sub 2} film electrode was designed and reported. The electrode was consisted of a TiO{sub 2} nanoparticle (NP) thin film layer sensitized with CdS quantum dot (QD) and an amorphous TiO{sub 2} coated TiO{sub 2} NP thin film layer that sensitized with C106 dye. The amorphous TiO{sub 2} layer was obtained by TiCl{sub 4} post-treatment to improve the properties of solar cells. Research showed that the solar cells fabricated with as-prepared hybrid-sensitized electrode exhibited excellent photovoltaic performances and a fairly high open circuit voltage of 796?mV was achieved.

Zhao, Yujie; Zhao, Wanyu; Chen, Jingkuo; Li, Huayang; Fu, Wuyou, E-mail: hari@hpu.edu.cn, E-mail: fuwy56@163.com; Sun, Guang; Cao, Jianliang; Zhang, Zhanying [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China)] [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China); Bala, Hari, E-mail: hari@hpu.edu.cn, E-mail: fuwy56@163.com [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China) [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China); College of Chemistry and Chemical Engineering, Inner Mongolia University for the Nationalities, Tongliao 028043 (China)

2014-01-06T23:59:59.000Z

273

Application of GTO voltage source inverter in a hybrid HVDC link  

SciTech Connect

This paper investigates the application of a GTO voltage source inverter in a two-terminal HVdc link, which is fed at the sending end by a line-commutated rectifier. This type of HVdc link may be applied when power transfer is predominantly unidirectional, especially to a weak ac system. The investigations are based on analytical studies and digital time-domain simulations with the Electro-Magnetic Transient program for DC systems (EMTDC). Control method and protection requirements are studied, together with dynamic behavior of the system following disturbances, e.g. dc fault, ac fault, start-up etc. The studies are aimed at exhibiting the technical feasibility of the proposed HVdc scheme. Need for further studies is pointed out when necessary.

Zhao, Z.; Iravani, M.R. (Univ. of Toronto, Ontario (Canada). Dept. of Electrical Engineering)

1994-01-01T23:59:59.000Z

274

Topology optimization-based distribution design of actuation voltage in static shape control of plates  

Science Journals Connector (OSTI)

This paper investigates the optimal spatial distribution of single-channel actuation voltage in static structural shape control problem. It is pointed out that single-channel actuation voltage input for shape control applications is of practical importance ... Keywords: Shape control, Single channel, Topology optimization, Voltage distribution

Zhan Kang; Liyong Tong

2008-10-01T23:59:59.000Z

275

Impact of Wind Generation Variability on Voltage Profile of Radial Power Systems  

Science Journals Connector (OSTI)

This paper provides the results of a study conducted to assess the impacts of the "wind generation variability" on the voltage profile in a small-scale radial power system. The power network has been modeled using one of the well-known simulation programs ... Keywords: Wind Generation, Voltage Profile, Power Grids, Voltage Impacts, Minimum Singular Value, SSV index

M. O. Alruwaili; M. Y. Vaziri; S. Vadhva; S. Vaziri

2013-04-01T23:59:59.000Z

276

Statistical Estimation of Leakage-Induced Power Grid Voltage Drop Considering Within-Die Process Variations  

E-Print Network (OSTI)

Statistical Estimation of Leakage-Induced Power Grid Voltage Drop Considering Within-Die Process the power grid, the grid develops large voltage drops, which is an unavoidable background level of noise on the grid. We develop techniques for estimation of the statistics of the leakage-induced power grid voltage

Najm, Farid N.

277

Statistical Estimation of LeakageInduced Power Grid Voltage Drop Considering WithinDie Process Variations #  

E-Print Network (OSTI)

Statistical Estimation of Leakage­Induced Power Grid Voltage Drop Considering Within­Die Process the power grid, the grid develops large voltage drops, which is an unavoidable background level of noise on the grid. We develop techniques for estimation of the statistics of the leakage­induced power grid voltage

Najm, Farid N.

278

Statistical Estimation of Circuit Timing Vulnerability Due to Leakage-Induced Power Grid Voltage Drop  

E-Print Network (OSTI)

Statistical Estimation of Circuit Timing Vulnerability Due to Leakage-Induced Power Grid Voltage voltage drops on the power grid that can affect circuit timing. We propose a statistical analysis supply voltage to circuit devices is referred to as the power grid. The consequences of power grid

Najm, Farid N.

279

Low-Voltage Ride-Through Techniques for DFIG-Based Wind Turbines  

E-Print Network (OSTI)

Low-Voltage Ride-Through Techniques for DFIG-Based Wind Turbines: State-of-the-Art Review deals with low-voltage ride-through (LVRT) capability of wind turbines (WTs) and in particular those as to index some emerging solutions. Index Terms--Wind turbine, doubly-fed induction generator, low voltage

Paris-Sud XI, Université de

280

Research on fuzzy logic based dynamic boundary voltage and reactive power integrated control method  

Science Journals Connector (OSTI)

Aiming at the existing problems of conventional substation voltage and reactive power integrated control method, a new fuzzy logic based dynamic reactive power boundary voltage and reactive power integrated control method is proposed. Fuzzy logic control ... Keywords: dynamic boundary, fuzzy logic, reactive power, voltage

Zigang Xu; Fei Wang

2009-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

DSP IMPLEMENTATION OF DC VOLTAGE REGULATION USING ADAPTIVE CONTROL FOR 200 KW 62000 RPM  

E-Print Network (OSTI)

to control the DC voltage for 200 kW induction generator rated at a speed of 62000 RPM under different load to regulate the DC voltage for high speed induction generators rated from 5 kW to 200 kW. ii #12DSP IMPLEMENTATION OF DC VOLTAGE REGULATION USING ADAPTIVE CONTROL FOR 200 KW 62000 RPM INDUCTION

Wu, Thomas

282

An Approximate Dynamic Programming Algorithm for the Allocation of High-Voltage Transformer Spares in the  

E-Print Network (OSTI)

An Approximate Dynamic Programming Algorithm for the Allocation of High-Voltage Transformer Spares high-voltage transformer spares throughout the electric grid to mitigate the risk of random transformer-voltage transformers are an integral part of the electric transmission system. A catas- trophic transformer failure

Powell, Warren B.

283

Application-Directed Voltage Scaling Johan Pouwelse, Koen Langendoen, and Henk Sips  

E-Print Network (OSTI)

--Clock (and voltage) scheduling is an important tech- nique to reduce the energy consumption of processors that sup- port voltage scaling. It is difficult, however, to achieve good re- sults using only statistics to the scheduler control- ling the clock speed and processor voltage. This paper describes our Energy Priority

Pouwelse, Johan

284

Performance Analysis of a Hybrid Asymmetric Multilevel Inverter for High Voltage Active Power Filter Applications  

E-Print Network (OSTI)

Performance Analysis of a Hybrid Asymmetric Multilevel Inverter for High Voltage Active Power voltage-source inverters connected in series (known as cascaded hybrid asymmetric multilevel inverter voltage application due to semiconductor constraint. In order to achieve higher power level, hybrid

Catholic University of Chile (Universidad Católica de Chile)

285

Power transformers - Part 11: Dry-type transformers  

E-Print Network (OSTI)

Applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 36 kV and at least one winding operating at greater than 1,1 kV. Applies to all construction technologies.

International Electrotechnical Commission. Geneva

2004-01-01T23:59:59.000Z

286

Type: Renewal  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1 INCITE Awards 1 INCITE Awards Type: Renewal Title: -Ab Initio Dynamical Simulations for the Prediction of Bulk Properties‖ Principal Investigator: Theresa Windus, Iowa State University Co-Investigators: Brett Bode, Iowa State University Graham Fletcher, Argonne National Laboratory Mark Gordon, Iowa State University Monica Lamm, Iowa State University Michael Schmidt, Iowa State University Scientific Discipline: Chemistry: Physical INCITE Allocation: 10,000,000 processor hours Site: Argonne National Laboratory Machine (Allocation): IBM Blue Gene/P (10,000,000 processor hours) Research Summary: This project uses high-quality electronic structure theory, statistical mechanical methods, and

287

Bacteria Types  

NLE Websites -- All DOE Office Websites (Extended Search)

Bacteria Types Bacteria Types Name: Evelyn Location: N/A Country: N/A Date: N/A Question: What is the significance of S. marcescens,M.luteus, S.epidermidis, and E. Coli? Which of these are gram-positive and gram-negative, and where can these be found? Also, what problems can they cause? When we culture these bacteria, we used four methods: plates, broth, slants, and pour plates. The media was made of TSB, TSA, NAP, and NAD. What is significant about these culturing methods? Replies: I could give you the answer to that question but it is more informative, and fun, to find out yourself. Start with the NCBI library online (http://www.ncbi.nlm.nih.gov/) and do a query with the species name, and 'virulence' if you want to know what they're doing to us. Have a look at the taxonomy devision to see how they are related. To find out if they're gram-pos or neg you should do a gram stain if you can. Otherwise you'll find that information in any bacteriology determination guide. Your question about the media is not specific enough so I can't answer it.

288

Boost type PWM HVDC transmission system  

SciTech Connect

This paper reports that conventional HVdc is built around the mercury arc rectifier or the thyristor which requires line commutation. The advances of fast, high power GTO's and future devices such as MCT's with turn off capabilities, are bringing PWM techniques within the range of HVdc applications. By combining PWM techniques to the boost type bridge topology, one has an alternate system of HVdc Transmission. On the ac side, the converter station has active controls over: the voltage amplitude, the voltage angle and the frequency. On the dc side, parallel connections facilitate multi-terminal load sharing by simple local controls so that redundant communication channels are not required. Bidirectional power through each station is accomplished by the reversal of the direction of dc current flow. These claims have been substantiated by experimental results from laboratory size multi-terminal models.

Ooi, B.T.; Wang, X. (McGill Univ., Montreal, PQ (Canada). Dept. of Electrical Engineering)

1991-10-01T23:59:59.000Z

289

High-voltage R-F feedthrough bushing  

DOE Patents (OSTI)

Described is a multi-element, high voltage radio frequency bushing for transmitting rf energy to an antenna located in a vacuum container. The bushing includes a center conductor of complex geometrical shape, an outer coaxial shield conductor, and a thin-walled hollow truncated cone insulator disposed between central and outer conductors. The shape of the center conductor, which includes a reverse curvature portion formed of a radially inwardly directed shoulder and a convex portion, controls the uniformity of the axial surface gradient on the insulator cone. The outer shield has a first substantially cylindrical portion and a second radially inwardly extending truncated cone portion.

Grotz, G.F.

1982-09-03T23:59:59.000Z

290

Outdoor PV Module Degradation of Current-Voltage Parameters: Preprint  

SciTech Connect

Photovoltaic (PV) module degradation rate analysis quantifies the loss of PV power output over time and is useful for estimating the impact of degradation on the cost of energy. An understanding of the degradation of all current-voltage (I-V) parameters helps to determine the cause of the degradation and also gives useful information for the design of the system. This study reports on data collected from 12 distinct mono- and poly-crystalline modules deployed at the National Renewable Energy Laboratory (NREL) in Golden, Colorado. Most modules investigated showed < 0.5%/year decrease in maximum power due to short-circuit current decline.

Smith, R. M.; Jordan, D. C.; Kurtz, S. R.

2012-04-01T23:59:59.000Z

291

Self-monitoring high voltage transmission line suspension insulator  

DOE Patents (OSTI)

A high voltage transmission line suspension insulator (18 or 22) which monitors its own dielectric integrity. A dielectric rod (10) has one larger diameter end fitting attachable to a transmission line and another larger diameter end fitting attachable to a support tower. The rod is enclosed in a dielectric tube (14) which is hermetically sealed to the rod's end fittings such that a liquidtight space (20) is formed between the rod and the tube. A pressurized dielectric liquid is placed within that space. A discoloring dye placed within this space is used to detect the loss of the pressurized liquid.

Stemler, Gary E. (Vancouver, WA); Scott, Donald N. (Vancouver, WA)

1981-01-01T23:59:59.000Z

292

Light-weight DC to very high voltage DC converter  

DOE Patents (OSTI)

A DC-DC converter capable of generating outputs of 100 KV without a transformer comprises a silicon opening switch (SOS) diode connected to allow a charging current from a capacitor to flow into an inductor. When a specified amount of charge has flowed through the SOS diode, it opens up abruptly; and the consequential collapsing field of the inductor causes a voltage and current reversal that is steered into a load capacitor by an output diode. A switch across the series combination of the capacitor, inductor, and SOS diode closes to periodically reset the SOS diode by inducing a forward-biased current.

Druce, Robert L. (Union City, CA); Kirbie, Hugh C. (Dublin, CA); Newton, Mark A. (Livermore, CA)

1998-01-01T23:59:59.000Z

293

Light-weight DC to very high voltage DC converter  

DOE Patents (OSTI)

A DC-DC converter capable of generating outputs of 100 KV without a transformer comprises a silicon opening switch (SOS) diode connected to allow a charging current from a capacitor to flow into an inductor. When a specified amount of charge has flowed through the SOS diode, it opens up abruptly; and the consequential collapsing field of the inductor causes a voltage and current reversal that is steered into a load capacitor by an output diode. A switch across the series combination of the capacitor, inductor, and SOS diode closes to periodically reset the SOS diode by inducing a forward-biased current. 1 fig.

Druce, R.L.; Kirbie, H.C.; Newton, M.A.

1998-06-30T23:59:59.000Z

294

Facility Type!  

Office of Legacy Management (LM)

ITY: ITY: --&L~ ----------- srct-r~ -----------~------~------- if yee, date contacted ------------- cl Facility Type! i I 0 Theoretical Studies Cl Sample 84 Analysis ] Production 1 Diepasal/Storage 'YPE OF CONTRACT .--------------- 1 Prime J Subcontract&- 1 Purchase Order rl i '1 ! Other information (i.e., ---------~---~--~-------- :ontrait/Pirchaee Order # , I C -qXlJ- --~-------~~-------~~~~~~ I I ~~~---~~~~~~~T~~~ FONTRACTING PERIODi IWNERSHIP: ,I 1 AECIMED AECMED GOVT GOUT &NTtiAC+OR GUN-I OWNED ----- LEEE!? M!s LE!Ps2 -LdJG?- ---L .ANDS ILJILDINGS X2UIPilENT IRE OR RAW HA-I-L :INAL PRODUCT IASTE Z. RESIDUE I I kility l pt I ,-- 7- ,+- &!d,, ' IN&"E~:EW AT SITE -' ---------------- , . Control 0 AEC/tlED managed operations

295

Bi-directional power control system for voltage converter  

DOE Patents (OSTI)

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

Garrigan, Neil Richard (Niskayuna, NY); King, Robert Dean (Schenectady, NY); Schwartz, James Edward (Slingerlands, NY)

1999-01-01T23:59:59.000Z

296

Control of Analyte Electrolysis in Electrospray Ionization Mass Spectrometry Using Repetitively Pulsed High Voltage  

SciTech Connect

Analyte electrolysis using a repetitively pulsed high voltage ion source was investigated and compared to that using a regular, continuously operating direct current high voltage ion source in electrospray ionization mass spectrometry. The extent of analyte electrolysis was explored as a function of the length and frequency of the high voltage pulse using the model compound reserpine in positive ion mode. Using +5 kV as the maximum high voltage amplitude, reserpine was oxidized to its 2, 4, 6 and 8-electron oxidation products when direct current high voltage was employed. In contrast, when using a pulsed high voltage, oxidation of reserpine was eliminated by employing the appropriate high voltage pulse length and frequency. This effect was caused by inefficient mass transport of the analyte to the electrode surface during the duration of the high voltage pulse and the subsequent relaxation of the emitter electrode/ electrolyte interface during the time period when the high voltage was turned off. This mode of ESI source operation allows for analyte electrolysis to be quickly and simply switched on or off electronically via a change in voltage pulse variables.

Kertesz, Vilmos [ORNL; Van Berkel, Gary J [ORNL

2011-01-01T23:59:59.000Z

297

INTRODUCTION In the Gulf of Mexico region, two types of  

E-Print Network (OSTI)

recoverable reserves of 10176 m.b. of oil and 5169 billion cubic feet (1464 � 108 m3) of gas (PEMEX Ruíz-Morales Jesús García-Hernández Región Marina Noreste, PEMEX Exploración y Producción, Ciudad del

Claeys, Philippe

298

2014 REGIONAL ECONOMIC OUTLOOK  

E-Print Network (OSTI)

2014 REGIONAL ECONOMIC OUTLOOK #12;2014 REGIONAL ECONOMIC OUTLOOK 2014 Overview The Cincinnati USA Partnership for Economic Development and the Northern Kentucky Chamber of Commerce are pleased to present the 2014 Regional Economic Outlook. This report was prepared by the Cincinnati USA Partnership's Regional

Boyce, Richard L.

299

LM139/LM239/LM339/LM2901/LM3302 Low Power Low Offset Voltage Quad Comparators  

E-Print Network (OSTI)

LM139/LM239/LM339/LM2901/LM3302 Low Power Low Offset Voltage Quad Comparators General Description The LM139 series consists of four independent precision voltage comparators with an offset voltage clock timers; multivibrators and high voltage digital logic gates. The LM139 series was designed

Lanterman, Aaron

300

Effect of the change in the load resistance on the high voltage pulse transformer of the intense electron-beam accelerators  

SciTech Connect

A high voltage pulse transformer (HVPT) is usually used as a charging device for the pulse forming line (PFL) of intense electron-beam accelerators (IEBAs). Insulation of the HVPT is one of the important factors that restrict the development of the HVPT. Until now, considerable effort has been focused on minimizing high field regions to avoid insulation breakdown between windings. Characteristics of the HVPT have been widely discussed to achieve these goals, but the effects of the PFL and load resistance on HVPT are usually neglected. In this paper, a HVPT is used as a charging device for the PFL of an IEBA and the effect of the change in the load resistance on the HVPT of the IEBA is presented. When the load resistance does not match the wave impedance of the PFL, a high-frequency bipolar oscillating voltage will occur, and the amplitude of the oscillating voltage will increase with the decrease in the load resistance. The load resistance approximates to zero and the amplitude of the oscillating voltage is much higher. This makes it easier for surface flashover along the insulation materials to form and decrease the lifetime of the HVPT.

Cheng Xinbing; Liu Jinliang; Qian Baoliang; Zhang Yu; Zhang Hongbo [College of Photoelectrical Science and Engineering, National University of Defense Technology, Hunan 410073 (China)

2009-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Regional Districts, Commissions, and Authorities (South Carolina) |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Regional Districts, Commissions, and Authorities (South Carolina) Regional Districts, Commissions, and Authorities (South Carolina) Regional Districts, Commissions, and Authorities (South Carolina) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State South Carolina Program Type Siting and Permitting Provider Regional Districts, Commissions, and Authorities

302

Local Voltage Support from Distributed Energy Resources to Prevent Air Conditioner Motor Stalling  

SciTech Connect

Microgrid voltage collapse often happens when there is a high percentage of low inertia air-conditioning (AC) motors in the power systems. The stalling of the AC motors results in Fault Induced Delayed Voltage Recovery (FIDVR). A hybrid load model including typical building loads, AC motor loads, and other induction motor loads is built to simulate the motoring stalling phenomena. Furthermore, distributed energy resources (DE) with local voltage support capability are utilized to boost the local bus voltage during a fault, and prevent the motor stalling. The simulation results are presented. The analysis of the simulation results show that local voltage support from multiple DEs can effectively and economically solve the microgrid voltage collapse problem.

Baone, Chaitanya A [ORNL] [ORNL; Xu, Yan [ORNL] [ORNL; Kueck, John D [ORNL] [ORNL

2010-01-01T23:59:59.000Z

303

Bright and fast voltage reporters across the visible spectrum via electrochromic FRET (eFRET)  

E-Print Network (OSTI)

We present a palette of brightly fluorescent genetically encoded voltage indicators (GEVIs) with excitation and emission peaks spanning the visible spectrum, sensitivities from 6 - 10% Delta F/F per 100 mV, and half-maximal response times from 1 - 7 ms. A fluorescent protein is fused to an Archaerhodopsin-derived voltage sensor. Voltage-induced shifts in the absorption spectrum of the rhodopsin lead to voltage-dependent nonradiative quenching of the appended fluorescent protein. Through a library screen, we identified linkers and fluorescent protein combinations which reported neuronal action potentials in cultured rat hippocampal neurons with a single-trial signal-to-noise ratio from 6.6 to 11.6 in a 1 kHz imaging bandwidth at modest illumination intensity. The freedom to choose a voltage indicator from an array of colors facilitates multicolor voltage imaging, as well as combination with other optical reporters and optogenetic actuators.

Zou, Peng; Douglass, Adam D; Hochbaum, Daniel R; Brinks, Daan; Werley, Christopher A; Harrison, D Jed; Campbell, Robert E; Cohen, Adam E

2014-01-01T23:59:59.000Z

304

Seismic vulnerability assessment of a high voltage disconnect switch  

Science Journals Connector (OSTI)

Abstract This paper deals with the seismic vulnerability of high voltage equipment typically installed in electric substations. In particular, the seismic response of a 380 kV vertical disconnect switch has been investigated based on the results of an experimental campaign carried out at Roma Tre University. According to a series of non-linear analyses, the influence of the most significant parameters on the seismic behavior of this apparatus has been analyzed and the corresponding fragility curves have been evaluated by using the Effective Fragility Analysis method. The results showed a limited vulnerability of the disconnect switch, whose most critical parts are the bottom joint of the ceramic support column and the steel column base.

Fabrizio Paolacci; Renato Giannini; Silvia Alessandri; Gianmarco De Felice

2014-01-01T23:59:59.000Z

305

Discriminator based on voltage comparator for nuclear physics research  

SciTech Connect

This paper describes a simple discriminator of low-level pulses with integral discrimination based on a K521SA3 comparator. The discriminator can be used to record pulses with durations of greater than or equal to 0.1 usec and amplitudes of greater than or equal to 1 mV. the input-pulse amplitude must not exceed the supply-voltage amplitude. A schematic diagram of the discriminator is given. For operation of the NGR spectrometer in the constant-velocity mode, the comparator was gated by the bipolar vibrator-velocity signal. The described circuit is reliable under laboratory conditions and its use is promising in multi-input systems such as those with multisection coordinate detectors.

Vorob'ev, V.A.; Kiselev, A.A.; Kuz'min, R.N.

1985-12-01T23:59:59.000Z

306

Effect of DC voltage pulses on memristor behavior.  

SciTech Connect

Current knowledge of memristor behavior is limited to a few physical models of which little comprehensive data collection has taken place. The purpose of this research is to collect data in search of exploitable memristor behavior by designing and implementing tests on a HP Labs Rev2 Memristor Test Board. The results are then graphed in their optimal format for conceptualizing behavioral patterns. This series of experiments has concluded the existence of an additional memristor state affecting the behavior of memristors when pulsed with positively polarized DC voltages. This effect has been observed across multiple memristors and data sets. The following pages outline the process that led to the hypothetical existence and eventual proof of this additional state of memristor behavior.

Evans, Brian R.

2013-10-01T23:59:59.000Z

307

Voltage flicker prediction for two simultaneously operated ac arc furnaces  

SciTech Connect

An EMTP-based arc furnace model was developed for evaluation of flicker concerns associated with supplying a large integrated steel mill as they go from one to two furnace operation and as system changes are implemented that will affect the short circuit capacity at the 230 kV power supply substation. The model includes a dynamic arc representation which is designed to be characteristic of the initial portions of the melt cycle when the arc characteristics are the most variable (worst flicker conditions). The flicker calculations are verified using previous measurements with one furnace operation. Flicker simulations were then performed to evaluate a variety of different possible system strengths with both one and two furnaces in operation. The primary flicker measure used for this study is the unweighted rms value of the fluctuation envelope, expressed as a percentage of the rms line-to-ground voltage magnitude.

Tang, L. [ABB Power T and D Co., Inc., Raleigh, NC (United States)] [ABB Power T and D Co., Inc., Raleigh, NC (United States); Kolluri, S. [Entergy Services, New Orleans, LA (United States)] [Entergy Services, New Orleans, LA (United States); McGranaghan, M.F. [Electrotek Concepts, Inc., Knoxville, TN (United States)] [Electrotek Concepts, Inc., Knoxville, TN (United States)

1997-04-01T23:59:59.000Z

308

Voltage spike detection in high field superconducting accelerator magnets  

SciTech Connect

A measurement system for the detection of small magnetic flux changes in superconducting magnets, which are due to either mechanical motion of the conductor or flux jump, has been developed at Fermilab. These flux changes are detected as small amplitude, short duration voltage spikes, which are {approx}15mV in magnitude and lasts for {approx}30 {micro}sec. The detection system combines an analog circuit for the signal conditioning of two coil segments and a fast data acquisition system for digitizing the results, performing threshold detection, and storing the resultant data. The design of the spike detection system along with the modeling results and noise analysis will be presented. Data from tests of high field Nb{sub 3}Sn magnets at currents up to {approx}20KA will also be shown.

Orris, D.F.; Carcagno, R.; Feher, S.; Makulski, A.; Pischalnikov, Y.M.; /Fermilab

2004-12-01T23:59:59.000Z

309

High-speed, sub-pull-in voltage MEMS switching.  

SciTech Connect

We have proposed and demonstrated MEMS switching devices that take advantage of the dynamic behavior of the MEMS devices to provide lower voltage actuation and higher switching speeds. We have explored the theory behind these switching techniques and have demonstrated these techniques in a range of devices including MEMS micromirror devices and in-plane parallel plate MEMS switches. In both devices we have demonstrated switching speeds under one microsecond which has essentially been a firm limit in MEMS switching. We also developed low-loss silicon waveguide technology and the ability to incorporate high-permittivity dielectric materials with MEMS. The successful development of these technologies have generated a number of new projects and have increased both the MEMS switching and optics capabilities of Sandia National Laboratories.

Spahn, Olga Blum; Brewer, Steven; Olsson, Roy H.; Bogart, Gregory R.; Luck, David L.; Watts, Michael R.; Shaw, Michael J.; Nielson, Gregory N.; Resnick, Paul James; Tigges, Christopher P.; Grossetete, Grant David

2008-01-01T23:59:59.000Z

310

Summary of multiterminal high-voltage direct current transmission technology  

SciTech Connect

This report summarizes the present state of multiterminal (MT) high-voltage direct current (HVDC) power transmission. The purpose is to reassess the need for HVDC circuit breakers and to identify needed research for MT HVDC. The fundamentals of this technology are presented, and previous research and development is reviewed. Although no MT HVDC systems have yet been built, many concepts have been proposed. Some require a dc breaker, and others do not. Both options have advantages and disadvantages for various applications, so the selection will depend on the proposed application. Research is needed to define operating characteristics of various MT HVDC systems. In some applications, dc breakers will be useful, so research into HVDC interruption should continue. Also, dc fault detection and control algorithms for MT systems should be studied.

Biggs, R.B.; Jewell, W.T.

1984-05-01T23:59:59.000Z

311

Impact of SCIG and DFIG Type Wind Turbine on the Stability of Distribution Networks: static and dynamic  

E-Print Network (OSTI)

Impact of SCIG and DFIG Type Wind Turbine on the Stability of Distribution Networks: static fed induction generator (DFIG) type wind turbine in distribution networks. The analysis is carried out and DFIG type wind turbines have significant impact on the static voltage stability, power loss

Pota, Himanshu Roy

312

Investigation of dc precise voltage sources for use as Zener transport standard  

SciTech Connect

20 precise compact voltage sources based on zener diodes were manufactured. These sources were under investigation at measuring system in NPO VNIIFTRI during the year. A few sources with voltage drift less than 5 ppm per year and noise level lower than 100 nV in the frequency band of 0,01-10 Hz were selected for manufacturing of 4-channels dc voltage transportable reference standard. This reference standard was investigated by Russian 1-V Josephson systems.

Karpov, O.V.; Shulga, V.M.; Shakirzyanova, F.R. [National Scientifical and Research Institute for Physical Technical and Radiotechnical Measurements, Moscow (Russian Federation)

1994-12-31T23:59:59.000Z

313

February 2008 Rev 21 1/49 Very low drop voltage regulators with inhibit  

E-Print Network (OSTI)

. In the three terminal configuration the device has the same electrical performance, but is fixed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4. Dropout voltage vs output current

Berns, Hans-Gerd

314

Object Oriented Safety Analysis of an Extra High Voltage Substation Bay  

Science Journals Connector (OSTI)

Experiences of application of the object oriented approach to safety analysis of an extra high voltage substation bay are presented. As the first step...

Bartosz Nowicki; Janusz Górski

1998-01-01T23:59:59.000Z

315

Dynamic voltage-current characteristics for a water jet plasma arc  

SciTech Connect

A virtual instrument technology is used to measure arc current, arc voltage, dynamic V-I characteristics, and nonlinear conductance for a cone-shaped water jet plasma arc under ac voltage. Experimental results show that ac arc discharge mainly happens in water vapor evaporated from water when heated. However, due to water's cooling effect and its conductance, arc conductance, reignition voltage, extinguish voltage, and current zero time are very different from those for ac arc discharge in gas work fluid. These can be valuable to further studies on mechanism and characteristics of plasma ac discharge in water, and even in gas work fluid.

Yang Jiaxiang; Lan Sheng; Xu Zuoming [College of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150040 (China)

2008-05-05T23:59:59.000Z

316

Lab Trials of an Electricity Transmission Line Voltage Sensor Based on Thermally Poled Silica Fibre  

Science Journals Connector (OSTI)

Voltage sensing using helically coiled lengths of thermally poled twin-hole silica optical fibre is presented. Lab accuracy test results showing good linearity and signal to noise...

Michie, Andrew M; Hambley, Philip; Bassett, Ian M; Haywood, John H; Henry, Peter; Ingram, John

317

The design of an A-C voltage regulator using a Wein Bridge detector  

E-Print Network (OSTI)

equipment, which in turn demands a mox'e closely regulated power supply. In satisfying these demands there have been many kinds of voltage regulators designed, constructed, and needs A voltage regulator oonsists essentially of two pax'ts, the "detectox...-V, 424-8, 470 3, 499-503 1950 4. Patchett, G. N. , "The Theory of Nonlinear Bridge Circuit Applied to Voltage Stabilizers, " J. I . E. E . , Vol. 93, Pt. III, p. 18 (1948). 5. Choudbury, J. K. t Das Gupta, S. C. , and Sen, P. C, , "An A-C Voltage...

Brown, Richard True

2012-06-07T23:59:59.000Z

318

Solid State NMR Studies and Local Structure of Voltage Fade Materials  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

with the Voltage Fade Team Michael Slater, Jason Croy, Kevin Gallagher, Christopher Johnson, Yang Ren DOE Vehicle Technologies Program Annual Merit Review Arlington, VA May 13 -...

319

Consideration of 34. 5 KV as an in-plant voltage for a large industrial user  

SciTech Connect

Traditionally, the in-plant distribution voltage for a large refinery or petrochemical complex has been 13.8 kV. Selection of this voltage level was dictated primarily by economic factors, simply because in most cases the magnitude of the loads or the lengths of the feeders did not produce sufficient savings to compensate for the costlier higher voltage switchgear. This paper presents some engineering and cost considerations for distribution at 34.5 kV and attempts to show that this voltage level is both economically and technically feasible for large electrical systems.

Niculescu, T.D.; Regan, R.R.

1983-09-01T23:59:59.000Z

320

E-Print Network 3.0 - affects voltage-gated calcium Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

modulate neuronal voltage-gated calcium cur- rents, we performed a whole-cell patch... that hippocampal neurons in an astrocyte-enriched environment show augmentation of...

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Theory and practice of dynamic voltage/frequency scaling in the high performance computing environment.  

E-Print Network (OSTI)

?? This dissertation provides a comprehensive overview of the theory and practice of Dynamic Voltage/Frequency Scaling (DVFS) in the High Performance Computing (HPC) environment. We… (more)

Rountree, Barry Louis

2010-01-01T23:59:59.000Z

322

A Region Thesaurus Approach for High-Level Concept Detection in the Natural Disaster Domain  

Science Journals Connector (OSTI)

This paper presents an approach on high-level feature detection using a region thesaurus. MPEG-7 features are locally extracted from ... This set of region types defines the region thesaurus. Using this thesaurus

Evaggelos Spyrou; Yannis Avrithis

2007-01-01T23:59:59.000Z

323

Virginia Regional Industrial Facilities Act (Virginia) | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Regional Industrial Facilities Act (Virginia) Regional Industrial Facilities Act (Virginia) Virginia Regional Industrial Facilities Act (Virginia) < Back Eligibility Commercial Construction Developer Industrial Investor-Owned Utility Local Government Municipal/Public Utility Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Virginia Program Type Industry Recruitment/Support Provider Regional Industrial Facility Authorities The Virginia Regional Industrial Facilities Act is meant to aid the economic development of localities within the Commonwealth. The Act provides a mechanism for localities to establish regional industrial facility authorities, enabling them to pool financial resources to stimulate economic development. The purpose of a regional industrial

324

Variable Voltage Substation Electric Fire and Emergency Response  

Energy.gov (U.S. Department of Energy (DOE))

Variable Voltage Substation Electric Fire and Emergency Response My question is from an emergency response perspective. You stated that it took ~ ½ for electricians to de-energize the electrical components before firefighters were allowed in to fight the fire. This delay causes more damage to equipment and potential propagation of the fire. Is there not a “master” breaker or switch? You’ve brought up a very good point. It gave me a good opportunity to discuss this with our Facilities Department and get a better understanding of the infrastructure upgrade plans. The direct answer to your question is “Yes, but…” Yes, there are “master” breakers and switches, but we can’t control them remotely. SLAC’s AC electrical distribution system at present is manual breakers – we have not installed the infrastructure to remotely control them (except see below). We recently underwent an upgrade to our Master Substation that will allow us to remotely control some high voltage breakers in the future, but we aren’t there yet. We do recognize the value in having this capability (and more importantly, our vulnerability in NOT having it), and have begun the preliminary planning to make this happen. One issue were are working on is cyber security for the power distribution networked infrastructure. Before we install the capability to remotely control the main electrical breakers, we are planning the infrastructure with our Information Technologies organization to ensure we have a robust secure network that is protected from unauthorized access. Once the cyber security issues are addressed and funded, we’re probably 5-10 years out from having remote operation capability due to limited resources to fund and install the infrastructure. Having said the above, we do have the capability of remotely opening the VVS Secondary Main Breakers – the ones that send power to the modulator distribution breakers - from our control room. Those breakers are integral parts of our safety systems in that interlock violation causes the breakers to open and remove power to the klystrons. But everything else is manual only. That remote operation capability would not have helped us in this case, as the VVS Secondary Main Breaker was the one that fried. We needed to open the breaker upstream of the VVS. Thanks for your interest. Let me know if I can provide further information.

325

An Ensemble Empirical Mode Decomposition Approach for Voltage Sag Detection in a Smart Grid Context  

E-Print Network (OSTI)

An Ensemble Empirical Mode Decomposition Approach for Voltage Sag Detection in a Smart Grid Context Yassine Amirat1,2 , Mohamed Benbouzid2 , Tianzhen Wang3 and Sylvie Turri2 Abstract­Smart grids have become, using the instantaneous power for voltage sags detection in smart grids. Copyright © 2013 Praise Worthy

Brest, Université de

326

Hydroelectric Voltage Generation Based on Water-Filled Single-Walled Carbon Nanotubes  

Science Journals Connector (OSTI)

Hydroelectric Voltage Generation Based on Water-Filled Single-Walled Carbon Nanotubes ... The hydroelectric voltage generator can be expressed by the model illustrated in Figure 6a and b. ... Individual water-filled single-walled carbon nanotubes as hydroelectric power converters ...

Quanzi Yuan; Ya-Pu Zhao

2009-04-21T23:59:59.000Z

327

Optimal Placement of the Wind Generators in the Medium Voltage Power Grid  

Science Journals Connector (OSTI)

The minimization of power losses in the medium voltage (MV) grid requires adjustment of network of power sources. This problem is particularly important for renewable energy sources, for example for the farms of wind generators. Their placement and nominal ... Keywords: medium voltage power grid, wind generators, genetic algorithms, parallel processing

Andrzej Jordan; Ryszard Szczebiot; Carsten Maple; Slawomir Cieslik

2011-04-01T23:59:59.000Z

328

Integrating a Feature Selection Algorithm for Classification of Voltage Sags Originated in Transmission and Distribution Networks  

Science Journals Connector (OSTI)

As a global problem in the power quality area, voltage sags are matter of high interest for both utilities and customers. With a view to resolving the problem of sag source location in the power network, this paper introduces a new method based on dimension ... Keywords: Direction, Hybrid Method, Mpca, Voltage Sag

Abbas Khosravi; Toni Martinez; Joaquim Melendez; Joan Colomer; Jorge Sanchez

2007-06-01T23:59:59.000Z

329

A genetic algorithm approach to voltage-VAR control in systems with distributed generation  

Science Journals Connector (OSTI)

This paper presents a case study that highlights the influences which the connection of distributed generation sources may have over the solutions of reactive power compensation and voltage control already existing in a given network. The problem of ... Keywords: distributed generation, genetic algorithms, renewable sources, voltage-var control

Iulia Coroama; Mihai Gavrilas; Ovidiu Ivanov

2010-10-01T23:59:59.000Z

330

A Static Pattern-Independent Technique for Power Grid Voltage Integrity Verification  

E-Print Network (OSTI)

A Static Pattern-Independent Technique for Power Grid Voltage Integrity Verification Dionysios Design verification must include the power grid. Checking that the voltage on the power grid does) the obviously large size of the power grids for modern high-performance chips, and ii) the difficulty of setting

Najm, Farid N.

331

A Static PatternIndependent Technique for Power Grid Voltage Integrity Verification #  

E-Print Network (OSTI)

A Static Pattern­Independent Technique for Power Grid Voltage Integrity Verification # Dionysios Design verification must include the power grid. Checking that the voltage on the power grid does) the obviously large size of the power grids for modern high­performance chips, and ii) the di#culty of setting

Najm, Farid N.

332

LM193/LM293/LM393/LM2903 Low Power Low Offset Voltage Dual Comparators  

E-Print Network (OSTI)

LM193/LM293/LM393/LM2903 Low Power Low Offset Voltage Dual Comparators General Description The LM clock timers; multivibrators and high voltage digital logic gates. The LM193 series was designed to directly interface with TTL and CMOS. When operated from both plus and minus power supplies, the LM193

Lanterman, Aaron

333

Chapter 19. High Voltage Insulation, Diagnostics and Energetic Electron and Photon Beam Interactions  

E-Print Network (OSTI)

Chapter 19. High Voltage Insulation, Diagnostics and Energetic Electron and Photon Beam Interactions 19-1 High Voltage Insulation, Diagnostics and Energetic Electron and Photon Beam Interactions 1. DC Properties of Modern Filled Epoxy Insulation Academic and Research Staff Dr. Chathan Cooke Sponsor

334

Creation of Onset Voltage Hash by Anode Spots in a Magnetoplasmadynamic Thruster  

E-Print Network (OSTI)

Creation of Onset Voltage Hash by Anode Spots in a Magnetoplasmadynamic Thruster Luke Uribarri flow rate) of onset voltage fluctuations in a magnetoplasmadynamic thruster operating with three anode materials, and an anode spot model is presented which provides a physical explanation for the properties

Choueiri, Edgar

335

Importance of the Equlibrium Node in Preventing the Voltage Collapse Occurs in the Wind Power System  

E-Print Network (OSTI)

Importance of the Equlibrium Node in Preventing the Voltage Collapse Occurs in the Wind Power collapse will occurs in a wind power system is discussed next. The method of power flow calculation is the specific analysis of a given simplified wind power system. Keywords--voltage collapse; Newton

Lavaei, Javad

336

Meter Any Wire, Anywhere by Virtualizing the Voltage Channel Thomas Schmid, David Culler, Prabal Dutta  

E-Print Network (OSTI)

Meter Any Wire, Anywhere by Virtualizing the Voltage Channel Thomas Schmid, David Culler, Prabal}@eecs.umich.edu culler@cs.berkeley.edu Abstract AC power meters require both voltage and current to be sampled physical proximity and fed into a single power metering de- vice. In this paper, we explore the viability

Dutta, Prabal

337

Onset Voltage Hash and Anode Spots in Quasi-Steady Magnetoplasmadynamic  

E-Print Network (OSTI)

Onset Voltage Hash and Anode Spots in Quasi-Steady Magnetoplasmadynamic Thrusters Luke Uribarri: Edgar Y. Choueiri November 2008 #12;ONSET VOLTAGE HASH AND ANODE SPOTS IN QUASI noise ("hash") and anode damage in a self-field, quasi-steady magnetoplasmadynamic thruster (MPDT

Choueiri, Edgar

338

Scaling of Anode Sheath Voltage Fall with the Operational Parameters in Applied-Field MPD  

E-Print Network (OSTI)

Scaling of Anode Sheath Voltage Fall with the Operational Parameters in Applied-Field MPD Thrusters (EPPDyL) Princeton University, Princeton, NJ, 08544, USA Scaling laws for the anode sheath voltage fall in applied-field MPD thrusters are derived in order to better understand the physics behind anode sheath

Choueiri, Edgar

339

Reactive power management of distribution networks with wind generation for improving voltage stability  

E-Print Network (OSTI)

Reactive power management of distribution networks with wind generation for improving voltage February 2013 Available online Keywords: Composite load Distributed generation D-STATCOM Q with distributed wind generation. Firstly, the impact of high wind penetration on the static voltage stability

Pota, Himanshu Roy

340

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power  

E-Print Network (OSTI)

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power. Nasiruzzaman Abstract--Voltage profile of distribution networks with dis- tributed generation are affected significantly due to the integra- tion of distributed generation (DG) on it. This paper presents a way

Pota, Himanshu Roy

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Direct Power Control of Doubly-Fed Generator Based Wind Turbine Converters to Improve Low Voltage  

E-Print Network (OSTI)

Control (DPC) is discussed for Low Voltage Ride Through (LVRT) of DFIG based wind turbine converters power integration state that doubly fed induction generator (DFIG) controllers should be capable and maintaining dc bus voltage, then the DFIG will stay online during the disturbance. A fast acting controller

Kimball, Jonathan W.

342

Energy Aware Dynamic Voltage and Frequency Selection for Real-Time Systems with Energy Harvesting  

E-Print Network (OSTI)

Energy Aware Dynamic Voltage and Frequency Selection for Real-Time Systems with Energy Harvesting}@binghamton.edu Abstract In this paper, an energy aware dynamic voltage and frequency selection (EA-DVFS) algorithm energy and the harvested energy in a future duration. Specifically, if the system has sufficient energy

Qiu, Qinru

343

The high voltage problem in the saturated core HTS fault current limiter  

Science Journals Connector (OSTI)

A small model of a one-phase saturated core HTS fault current limiter was developed. It consists of an iron core, an AC coil and a DC HTS coil. The HTS coil comprised six 126 turns double-pancakes (ID 70 mm), wound after heat treatment from Bi-2223 multifilamentary tape in Ag matrix. A fault simulation circuit was set up to characterize the dynamic properties of the model limiter. The voltages and currents of the AC coil and the DC HTS coil were measured through a computer-based data acquisition system. The tests have shown that the limiter has a fast response and the first current peak can be easily limited, but a high voltage will be induced on the DC HTS coil side during the fault state. This high voltage can badly affect the DC current equipment on the DC HTS coil side. The origin and value of the high voltage can be explained using a transformer model. For a limiter with n1 turns AC coil and n2 turns DC coil, the largest induced voltage will be roughly close to (n2/n1)U, where U is the rated voltage of the limiter. To commercialize this kind of limiter, the high voltage problem must be solved. Some different designs were introduced to lower the induced voltage.

Y.F. He; J.H. Li; X.H. Zong; J. Sun; Y.N. Wang; C.L. Wu; J.X. Wang

2003-01-01T23:59:59.000Z

344

A theoretical study of the incandescent filament lamp performance under voltage flicker  

SciTech Connect

Incandescent filament lamp flicker, produced by voltage fluctuation, is a power quality problem that caused engineering concern since the onset of electrical illumination technology. The flicker phenomenon was analyzed and explained in early studies. Standards dealing with acceptable flicker levels are well known, nevertheless, today the discussion about flicker continues to be a top priority topic due to the fact that steady-state and transient voltage waveform distortion is a growing problem in low and medium voltage systems. In many situations voltage flicker is caused by subharmonics and interharmonics of voltage. Cycloconverters, welders and arc furnaces, eccentrically operating tools and integral cycle controlled power equipment are notorious for producing voltage flicker. The goal of this paper is to provide solid mathematical basis for the analytical modeling of incandescent filament lamp flicker when the voltage is nonsinusoidal. A mathematical model that enables the evaluation of the luminous flux modulation caused by noninteger harmonics (subharmonics and interharmonics) is presented. Three situations are detailed: square-wave voltage modulation, sinusoidal modulation and the case of noninteger harmonics with nearly contiguous frequencies.

Peretto, L. [Univ. of Bologna (Italy)] [Univ. of Bologna (Italy); Emanuel, A.E. [Worcester Polytechnic Inst., MA (United States)] [Worcester Polytechnic Inst., MA (United States)

1997-01-01T23:59:59.000Z

345

Evaluation of Insulation Systems for the Optimal Design of High Voltage Pulse Transformers  

E-Print Network (OSTI)

This paper presents a study for the design of the insulation systems of high voltage pulse transformer based on experimental tests and numerical simulations. Data of high voltage tests on solid and liquid insulation materials are presented and discussed. The understanding of each part of the insulation is supported by electrostatic fields simulations.

Sylvain, Candolfi; Davide, Aguglia; Philippe, Viarouge; Jürgen, Biela; Jerome, Cros

2015-01-01T23:59:59.000Z

346

DECENTRALIZED VOLTAGE CONTROL TO MINIMIZE DISTRIBUTION LOSSES IN AN ISLANDED MICROGRID  

E-Print Network (OSTI)

power sources and energy storage systems such as batteries requires new power and voltage control-time voltage control algorithm that minimizes power losses for a microgrid supported by inverter based Microgrids can bring electricity power to rural communities or isolated military forward operation bases

Peng, Huei

347

The activated state of a sodium channel voltage sensor in a membrane environment  

Science Journals Connector (OSTI)

...suggests a displacement of ?4 elementary charges per subunit across...voltage sensor reveals a focused electric field . Nature 427 ( 6974...CA Horn R ( 2005 ) Focused electric field across the voltage sensor of potassium...protease activity for protamine resistance of Escherichia coli . Arch...

Sudha Chakrapani; Pornthep Sompornpisut; Pathumwadee Intharathep; Benoît Roux; Eduardo Perozo

2010-01-01T23:59:59.000Z

348

Public Opinions of Building Additional High-Voltage Electric Power Lines  

E-Print Network (OSTI)

to build new power lines. Residents living in counties with planned routes for new transmission linesPublic Opinions of Building Additional High-Voltage Electric Power Lines A Report to the National-Voltage Electric Power Lines: A Report to the National Science Foundation and the Electric Power Research Center

Tesfatsion, Leigh

349

A new technique to reject dc-link voltage ripple in PWM inverters  

E-Print Network (OSTI)

on the rlc-link, is numerically calculated. Let us assume, Inverfer output frequency f, ? 60 Hz Vs, = 1 pu Dc ? link voltage rrpple = k Vs, ? 0. 2 x Vge = . 2 pu Dc ? link voltage ripple frequency f, = 120 Hz :tfodulation index ? 0. 5 Frequency spectrum...

Shireen, Wajiha

1990-01-01T23:59:59.000Z

350

VOLTAGE COLLAPSE AND TRANSIENT ENERGY FUNCTION ANALYSES OF AC/DC SYSTEMS  

E-Print Network (OSTI)

for power system dynamic models, including a third order representation of high voltage direct current (HVDC power limits, HVDC firing angle limits and voltage dependent current order limits (VDCOL) are shown the derivation of individual component Lyapunov functions for simplified models of HVDC links connected

Cañizares, Claudio A.

351

Western Regional Partnership Overview  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Regional Partnership Overview Regional Partnership Overview June 2013 Briefing Overview  WRP Background  Importance of Region  WRP Tribal Relations Committee  WRP Energy Committee WRP Region's Uniqueness  5 states stretching from the Great Plains to the Pacific Ocean  Diverse terrain ranging from desert valleys to forested mountains  Significant State Trust Landholdings  Approximately 188 Federally recognized Tribes  Significant amounts of Federally managed land  According to GSA 2004 study, WRP states range from 41.8% - 84.5% of total state land WRP Region's Importance to DoD  Extensive Training Ranges  Interconnected ground/air ranges provide unmatched warfighter training opportunities

352

High voltage power supply with modular series resonant inverters  

DOE Patents (OSTI)

A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360.degree./n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply. Where it is desired to make electrical isolation breaks, tubes comprised of insulating material such as nylon are used to provide insulation and continue the fluid circuit.

Dreifuerst, Gary R. (Livermore, CA); Merritt, Bernard T. (Livermore, CA)

1995-01-01T23:59:59.000Z

353

High voltage power supply with modular series resonant inverters  

DOE Patents (OSTI)

A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360{degree}/n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply. Where it is desired to make electrical isolation breaks, tubes comprised of insulating material such as nylon are used to provide insulation and continue the fluid circuit. 11 figs.

Dreifuerst, G.R.; Merritt, B.T.

1995-07-18T23:59:59.000Z

354

Regional Comparisons, Spatial Aggregation,  

Gasoline and Diesel Fuel Update (EIA)

Regional Regional Comparisons, Spatial Aggregation, and Asymmetry of Price Pass-Through in U.S. Gasoline Markets MICHAEL YE*, JOHN ZYREN**, JOANNE SHORE**, AND MICHAEL BURDETTE** Abstract Spot to retail price pass-through behavior of the U.S. gasoline market was investigated at the national and regional levels, using weekly wholesale and retail motor gasoline prices from January 2000 to the present. Asymmetric pass-through was found across all regions, with faster pass-through when prices are rising. Pass-through patterns, in terms of speed and time for completion, were found to vary from region to region. Spatial aggregation was investigated at the national level and the East Coast with the aggregated cumulative pass-through being greater than the volume-weighted regional pass-through when spot prices increase. These results are useful to the petroleum industry, consumers,

355

High-Voltage Broadband-Over-Powerline (HV-BPL) Field Test Report | Open  

Open Energy Info (EERE)

High-Voltage Broadband-Over-Powerline (HV-BPL) Field Test Report High-Voltage Broadband-Over-Powerline (HV-BPL) Field Test Report Jump to: navigation, search Tool Summary LAUNCH TOOL Name: High-Voltage Broadband-Over-Powerline (HV-BPL) Field Test Report Focus Area: Crosscutting Topics: Policy Impacts Website: www.netl.doe.gov/smartgrid/referenceshelf/reports/HV-BPL_Final_Report. Equivalent URI: cleanenergysolutions.org/content/high-voltage-broadband-over-powerline Language: English Policies: "Deployment Programs,Financial Incentives" is not in the list of possible values (Deployment Programs, Financial Incentives, Regulations) for this property. DeploymentPrograms: Technical Assistance This reports details findings from a pilot High Voltage Broadband over Power Line (HV-BPL) program, an effort to develop a disruptive technology

356

Determination of the inductance of imploding wire array Z-pinches using measurements of load voltage  

SciTech Connect

The inductance of imploding cylindrical wire array z-pinches has been determined from measurements of load voltage and current. A thorough analysis method is presented that explains how the load voltage of interest is found from raw signals obtained using a resistive voltage divider. This method is applied to voltage data obtained during z-pinch experiments carried out on the MAGPIE facility (1.4 MA, 240 ns rise-time) in order to calculate the load inductance and thereafter the radial trajectory of the effective current sheath during the snowplough implosion. Voltage and current are monitored very close to the load, allowing these calculations to be carried out without the need for circuit modelling. Measurements give a convergence ratio for the current of between 3.1 and 5.7 at stagnation of the pinch.

Burdiak, G. C.; Lebedev, S. V.; Hall, G. N.; Harvey-Thompson, A. J.; Suzuki-Vidal, F.; Swadling, G. F.; Khoory, E.; Pickworth, L.; Bland, S. N.; Grouchy, P. de; Skidmore, J. [Blackett Laboratory, Imperial College, London SW7 2BW (United Kingdom)

2013-03-15T23:59:59.000Z

357

A novel approach for the improvement of open circuit voltage and fill factor of InGaAsSb/GaSb thermophotovoltaic cells  

SciTech Connect

Heterojunction n-Al{sub 0.25}Ga{sub 0.75}As{sub 0.02}Sb{sub 098}/p-In{sub 0.16}Ga{sub 0.84}As{sub 0.04}Sb{sub 0.96} thermophotovoltaic (TPV) cells were grown by molecular-beam epitaxy on n-GaSb-substrates. In the spectral range from 1 {micro}m to 2.1 {micro}m these cells, as well as homojunction n-p-In{sub 0.16}Ga{sub 0.84}As{sub 0.04}Sb{sub 0.96} cells, have demonstrated internal quantum efficiencies exceeding 80%, despite about a 200 meV barrier in the conduction band at the heterointerface. Estimation shows that the thermal emission of the electrons photogenerated in p-region over this barrier can provide high efficiency for hetero-cells if the electron recombination time in p-In{sub 0.16}Ga{sub 0.84}As{sub 0.04}Sb{sub 0.96}is longer than 10 ns. Keeping the same internal efficiency as homojunction cells, hetero-cells provide a unique opportunity to decrease the dark forward current and thereby increase open circuit voltage (V{sub {proportional_to}}) and fill factor at a given illumination level. It is shown that the decrease of the forward current in hetero-cells is due to the lower recombination rate in n-type wider-bandgap space-charge region and to the suppression of the hole component of the forward current. The improvement in V{sub {proportional_to}} reaches 100% at illumination level equivalent to 1 mA/cm{sup 2} and it decreases to 5% at the highest illumination levels (2--3 A/cm{sup 2}), where the electron current component dominates in both the homo- and heterojunction cells. Values of V{sub {proportional_to}} as high as 310 meV have been obtained for a hetero-cell at illumination levels of 3 A/cm{sup 2}. Under this condition, the expected fill factor value is about 72% for a hetero-cell with improved series resistance. The heterojunction concept provides excellent prospects for further reduction of the dark forward current in TPV cells.

Garbuzov, D.Z.; Martinelli, R.U.; Khalfin, V.; Lee, H.; Morris, N.A.; Taylor, G.C.; Connolly, J.C. [Sarnoff Corp., Princeton, NJ (United States); Charache, G.W.; DePoy, D.M. [Lockheed-Martin, Inc., Schenectady, NY (United States)

1997-10-01T23:59:59.000Z

358

Regional Dynamics Model (REDYN) | Open Energy Information  

Open Energy Info (EERE)

Regional Dynamics Model (REDYN) Regional Dynamics Model (REDYN) Jump to: navigation, search Tool Summary Name: REDYN Agency/Company /Organization: Regional Dynamics Inc. Sector: Energy Phase: Determine Baseline, "Evaluate Options and Determine Feasibility" is not in the list of possible values (Bring the Right People Together, Create a Vision, Determine Baseline, Evaluate Options, Develop Goals, Prepare a Plan, Get Feedback, Develop Finance and Implement Projects, Create Early Successes, Evaluate Effectiveness and Revise as Needed) for this property., Develop Goals Topics: Market analysis, Policies/deployment programs, Co-benefits assessment, - Macroeconomic Resource Type: Software/modeling tools User Interface: Desktop Application Website: www.regionaldynamics.com/

359

About Rocky Mountain Region  

NLE Websites -- All DOE Office Websites (Extended Search)

Rates About the Rocky Mountain Region RM Office The Platte River Power Authority in Colorado, Nebraska Public Power District, Kansas Electric Power Cooperative and Wyoming...

360

A novel voltage and frequency controller for standalone DFIG based Wind Energy Conversion System  

Science Journals Connector (OSTI)

Abstract This paper presents a new speed-sensorless control strategy for a stand-alone doubly-fed induction generator supplying energy to an isolated load. The method is based on the root mean square (rms) detection scheme. The generated stator voltage is controlled via rotor currents. Amplitude of stator voltage and its frequency are controlled simultaneously. The output signals from the voltage controllers are the reference signals for the rotor current amplitude and frequency of the stator voltage is regulated with the help of frequency control loop. This developed direct voltage control method is applicable for both the balanced and unbalanced load and also for standalone and grid connected mode. The control pulses for the rotor side converter is supplied by the hysteresis controller which is operated on the error signal calculated between actual and reference rotor currents. This paper also provides the brief idea about the voltage and frequency control on modern Autonomous DFIG based Wind Energy Systems via single phase mathematical model of standalone DFIG system. A short state-of-the-art review on mechanical position/speed sensorless control schemes for autonomous DFIG based \\{WESs\\} is presented, which helps the present researcher and students working in this area. These include stator flux oriented control techniques; direct voltage control techniques; MARS observer based techniques for autonomous DFIG-based variable-speed WESs. Simulation results obtained from a 2MVA DFIG system, prototype in MATLab/Simulink, are presented and discussed in this paper.

Rishabh Dev Shukla; Ramesh Kumar Tripathi

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Irradiation and annealing of p-type silicon carbide  

SciTech Connect

The development of the technology of semiconductor devices based on silicon carbide and the beginning of their industrial manufacture have made increasingly topical studies of the radiation hardness of this material on the one hand and of the proton irradiation to form high-receptivity regions on the other hand. This paper reports on a study of the carrier removal rate (V{sub d}) in p-6H-SiC under irradiation with 8 MeV protons and of the conductivity restoration in radiation- compensated epitaxial layers of various p-type silicon carbide polytypes. V{sub d} was determined by analysis of capacitance-voltage characteristics and from results of Hall effect measurements. It was found that the complete compensation of samples with the initial value of Na - Nd ? 1.5 × 10{sup 18} cm{sup ?3} occurs at an irradiation dose of ?1.1 × 10{sup 16} cm{sup ?2}. It is shown that specific features of the sublimation layer SiC (compared to CVD layers) are clearly manifested upon the gamma and electron irradiation and are hardly noticeable under the proton and neutron irradiation. It was also found that the radiation-induced compensation of SiC is retained after its annealing at ?1000°C. The conductivity is almost completely restored at T ? 1200°C. This character of annealing of the radiation compensation is independent of a silicon carbide polytype and the starting doping level of the epitaxial layer. The complete annealing temperatures considerably exceed the working temperatures of SiC-based devices. It is shown that the radiation compensation is a promising method in the technology of high-temperature devices based on SiC.

Lebedev, Alexander A.; Bogdanova, Elena V.; Grigor'eva, Maria V.; Lebedev, Sergey P. [A.F. Ioffe Physical-Technical Institute, St. Petersburg, 194021 (Russian Federation); Kozlovski, Vitaly V. [St. Petersburg State Polytechnic University, St. Petersburg, 195251 (Russian Federation)

2014-02-21T23:59:59.000Z

362

An Annotated Bibliography of High-Voltage Direct-Current Transmission and Flexible AC Transmission (FACTS) Devices, 1991-1993.  

SciTech Connect

References are contained for HVDC systems, converter stations and components, overhead transmission lines, cable transmission, system design and operations, simulation of high voltage direct current systems, high-voltage direct current installations, and flexible AC transmission system (FACTS).

Litzenberger, Wayne; Lava, Val

1994-08-01T23:59:59.000Z

363

Cape Cod Regional Transit Authority | Open Energy Information  

Open Energy Info (EERE)

Cod Regional Transit Authority Cod Regional Transit Authority Jump to: navigation, search Name Cape Cod Regional Transit Authority Facility Cape Cod Regional Transit Authority Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Sustainable Energy Development Energy Purchaser Cape Cod Regional Transit Authority Location Hyannis MA Coordinates 41.69005134°, -70.14437914° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.69005134,"lon":-70.14437914,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

364

Princeton Power Systems (TRL 5 6 Component)- Marine High-Voltage Power Conditioning and Transmission System with Integrated Energy Storage  

Energy.gov (U.S. Department of Energy (DOE))

Princeton Power Systems (TRL 5 6 Component) - Marine High-Voltage Power Conditioning and Transmission System with Integrated Energy Storage

365

Source of Sustained Voltage Difference between the Xylem of a Potted Ficus benjamina Tree and Its Soil  

E-Print Network (OSTI)

It has long been known that there is a sustained electrical potential (voltage) difference between the xylem of many plants

Mershin, Andreas

366

High Power, High Voltage FETs in Linear Applications: A User's Perspective  

SciTech Connect

The specifications of the current crop of highpower, high-voltage field-effect transistors (FETs) can lure a designer into employing them in high-voltage DC equipment. Devices with extremely low on-resistance and very high power ratings are available from several manufacturers. However, our experience shows that high-voltage, linear operation of these devices at near-continuous duty can present difficult reliability challenges at stress levels well-below their published specifications. This paper chronicles the design evolution of a 600 volt, 8 ampere shunt regulator for use with megawatt-class radio transmitters, and presents a final design that has met its reliability criteria.

N. Greenough, E. Fredd, S. DePasquale

2009-09-21T23:59:59.000Z

367

Monitoring voltage collapse margin with synchrophasors across transmission corridors with multiple lines and multiple contingencies  

E-Print Network (OSTI)

We use synchrophasor measurements of the complex voltage and current at both ends of multiple transmission lines that connect areas of a power system to monitor the online voltage collapse margin. A new reduction is used to reduce the multiple transmission lines to a single line equivalent and determine how to combine the synchrophasor measurements. Generator reactive power limits can be accommodated. The results show that this methodology can capture the effect of multiple contingencies inside the transmission corridors, giving awareness to the operators about the severity of contingencies with respect to voltage stability.

Ramirez, Lina

2014-01-01T23:59:59.000Z

368

A high-stability scanning tunneling microscope achieved by an isolated tiny scanner with low voltage imaging capability  

SciTech Connect

We present a novel homebuilt scanning tunneling microscope (STM) with high quality atomic resolution. It is equipped with a small but powerful GeckoDrive piezoelectric motor which drives a miniature and detachable scanning part to implement coarse approach. The scanning part is a tiny piezoelectric tube scanner (industry type: PZT-8, whose d{sub 31} coefficient is one of the lowest) housed in a slightly bigger polished sapphire tube, which is riding on and spring clamped against the knife edges of a tungsten slot. The STM so constructed shows low back-lashing and drifting and high repeatability and immunity to external vibrations. These are confirmed by its low imaging voltages, low distortions in the spiral scanned images, and high atomic resolution quality even when the STM is placed on the ground of the fifth floor without any external or internal vibration isolation devices.

Wang, Qi; Wang, Junting; Lu, Qingyou, E-mail: qxl@ustc.edu.cn [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China) [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China); Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Hou, Yubin [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China)] [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China)

2013-11-15T23:59:59.000Z

369

Neurodegeneration in cerebellar granule cells of p/q type voltage gated calcium channel mutant leaner mice  

E-Print Network (OSTI)

the extent of neuronal cell death, basal intracellular calcium and mitochondrial (dys)function in cerebellar granule cells (CGC) of adult leaner mice; 2) to analyze the role of the leaner calcium channel mutation on postnatal development of CGCs; and 3...

Bawa, Bhupinder

2009-05-15T23:59:59.000Z

370

Cerebellar Purkinje cell death in the P/Q -type voltage-gated calcium ion channel mutant mouse, leaner  

E-Print Network (OSTI)

inducing an inflammatory response in the tissue surrounding the affected cell (Sastry and Rao, 2000; Yuan and Yankner, 2000; Yuan, et al., 2003). Programmed cell death is an essential requirement for normal neurodevelopment and a key component of many...

Frank-Cannon, Tamy Catherine

2006-04-12T23:59:59.000Z

371

Voltage-sensor sodium channel mutations cause hypokalemic periodic paralysis type 2 by enhanced inactivation and reduced current  

Science Journals Connector (OSTI)

...eliminated by -P/4 protocol. Series resistance errors were elementary charges (e 0 ). This is in agreement...Chromosome Mapping DNA Mutational Analysis Electric Conductivity Exons genetics Female Heterozygote...

Karin Jurkat-Rott; Nenad Mitrovic; Chao Hang; Alexei Kouzmenkine; Paul Iaizzo; Jürgen Herzog; Holger Lerche; Sophie Nicole; Jose Vale-Santos; Dominique Chauveau; Bertrand Fontaine; Frank Lehmann-Horn

2000-01-01T23:59:59.000Z

372

Electromagnetic interference from transmission lines located in central region of Saudi Arabia  

SciTech Connect

This paper discusses the electromagnetic interference (EMI) generated by transmission lines operating in the Central Region of Saudi Arabia. These lines have operating voltages of 132, 230 and 380 kV and are located in a hot, dry arid desert land where precipitaton is very low. Measurements of typical EMI characteristics such as frequency spectrum, lateral profile and statistical variation are performed for each type of line and results are analyzed. It is found that general noise characteristic of these lines are similar to those reported in the literature for other lines which are located in relatively wet environment. The results further show that if operating gradients are low, the increase of EMI due to rain is lower than 20 dB value usually observed. The presence of sand and dust storms does not increase EMI level in any appreciable manner. The fair weather EMI level of these lines can be predicted with reasonable accuracy by using the CIGRE formula. Results are also presented for power line carrier related EMI.

Al-Arainy, A.A.; Malik, N.H.; Abdul-Aal, L.N.

1988-01-01T23:59:59.000Z

373

Electromagnetic interference from transmission lines located in central region of Saudi Arabia  

SciTech Connect

This paper discusses the electromagnetic interference (EMI) generated by transmission lines operating in the Central Region of Saudi Arabia. These lines have operating voltages of 132, 230 and 380 kV and are located in a hot, dry arid desert land where precipitation is very low. Measurements of typical EMI characteristics such as frequency spectrum, lateral profile and statistical variation are performed for each type of line and results are analyzed. It is found that general noise characteristic of these lines are similar to those reported in the literature for other lines which are located in relatively wet environment. The results further show that if operating gradients are low, the increase of EMI due to rain is lower than 20 dB value usually observed. The presence of sand and dust storms does not increase EMI level in any appreciable manner. The fair weather EMI level of these lines can be predicted with reasonable accuracy by using the CIGRE formula. Results are also presented for power line carrier related EMI.

Al-Arainy, A.A.; Malik, N.H.; Abdul-Aal, L.N.

1989-01-01T23:59:59.000Z

374

HYDROGEN REGIONAL INFRASTRUCTURE PROGRAM  

E-Print Network (OSTI)

to serve as "go-to" organization to catalyze PA Hydrogen and Fuel Cell Economy development #12;FundingHYDROGEN REGIONAL INFRASTRUCTURE PROGRAM IN PENNSYLVANIA HYDROGEN REGIONAL INFRASTRUCTURE PROGRAM IN PENNSYLVANIA Melissa Klingenberg, PhDMelissa Klingenberg, PhD #12;Hydrogen ProgramHydrogen Program Air Products

375

Regional Analysis Briefs  

Reports and Publications (EIA)

Regional Analysis Briefs (RABs) provide an overview of specific regions that play an important role in world energy markets, either directly or indirectly. These briefs cover areas that are currently major producers (Caspian Sea), have geopolitical importance (South China Sea), or may have future potential as producers or transit areas (East Africa, Eastern Mediterranean).

2028-01-01T23:59:59.000Z

376

Regional Competitions - EERE Commercialization Office  

NLE Websites -- All DOE Office Websites (Extended Search)

Regional Competitions Six Regional Clean Energy Business Plan Competitions are taking place across the country- representing all of the United States' distinct regions. The...

377

A SCR SWITCHED CAPACITOR VOLTAGE REGULATOR FOR 150 kV NEUTRAL BEAM POWER SUPPLY  

E-Print Network (OSTI)

2 ;;o c: REGULATOR BANK SCR TRIGGER CHASSIS BLOCK DIAGRAMLBL-8156 UC-20 A SCR SWITCHED CAPACITOR VOLTAGE REGULATORwill discharge through the SCR and the diodes. All of the

Milnes, K.A.

2011-01-01T23:59:59.000Z

378

Backstepping DC Voltage Control in a Multi-terminal HVDC System Connecting Offshore Wind Farms  

Science Journals Connector (OSTI)

Wind power is projected to play an important ... current and future power systems. To integrate offshore wind farms to the existing onshore grid, voltage source ... in a safe range. To distribute transmitted wind

Xiaodong Zhao; Kang Li; Yusheng Xue

2014-01-01T23:59:59.000Z

379

Generalized charge simulation method for the calculation of the electric field in high voltage substations  

Science Journals Connector (OSTI)

This paper deals with the calculation of the electric field strength in high voltage (HV) substations comprising complex geometrical structures. Generalized charge simulation ... is to examine the influence of to...

Aleksandar Rankovi?; Milan S. Savi?

2010-07-01T23:59:59.000Z

380

Research on Low-Voltage Early Warning System of Coalmine Power Grid  

Science Journals Connector (OSTI)

Research is proposed on coalmine power grid safety-running in case to insure coalmine ... voltage problem now still lying in the coalmine power grid, a method combined fuzzy comprehensive evaluation with gray com...

Tieying Zhao; Na Wang

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Scaling Analysis of On-Chip Power Grid Voltage Variations in Nanometer Scale ULSI  

Science Journals Connector (OSTI)

This paper presents a detailed scaling analysis of the power supply distribution network voltage drop in DSM technologies. The effects of chip temperature, electromigration and interconnect technology scaling (in...

Amir H. Ajami; Kaustav Banerjee…

2005-03-01T23:59:59.000Z

382

Voltage Sag-Related Upsets of Industrial Process Controls in Petroleum and Chemical Industries  

E-Print Network (OSTI)

with PLC controls. The sensitivity of these process controls can stop an essential service motor required for a continuous process such as in a refinery or chemical plant. Typically the controls are sensitive to the common momentary voltage sag caused...

Mansoor, A.; Key, T.; Woinsky, S.

383

Vehicle Technologies Office Merit Review 2014: High-Voltage Solid Polymer Batteries for Electric Drive Vehicles  

Energy.gov (U.S. Department of Energy (DOE))

Presentation given by Seeo, Inc. at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about high-voltage solid polymer...

384

Insulation co-ordination for continuous operating voltages and temporary overvoltages  

Science Journals Connector (OSTI)

This paper presents an approach to the insulation co-ordination of electric-power installations in ... calculate the necessary required withstand voltages of unit insulations for short-duration (1 min) power-...

Zlatoje Zdravkovi?; Petar Vukelja; Jovan Mrvi?

2006-06-01T23:59:59.000Z

385

Optical High Voltage Sensor with Oil- and Gas-free Insulation  

Science Journals Connector (OSTI)

We present an electro-optic high voltage sensor with novel oil- and gas-free insulation based on capacitive electric field steering. The sensor's accuracy is within ±0.2% in a...

Marchese, Sergio V; Wildermuth, Stephan; Steiger, Olivier; Pascal, Joris; Bohnert, Klaus; Eriksson, Göran; Czyzewski, Jan

386

Algorithms for Combined Inter- and Intra-Task Dynamic Voltage Scaling  

Science Journals Connector (OSTI)

......CDVS well by fully exploiting the benefit of voltage scaling and processor's...No. 2011- 0029805), under the Smart IT Convergence System Research Center...Cognitive Packet Network. Int. Conf. Smart Grids Green Communications and IT Energy-aware......

Hyungjung Seo; Jaewon Seo; Taewhan Kim

2012-11-01T23:59:59.000Z

387

Analysis of asset health : an approach to monitoring and diagnostics for medium voltage circuit breakers  

E-Print Network (OSTI)

The Medium Voltage Electric Industry is a very conservative and risk adverse sector that has undergone very little change in the past 30 years when compared to other technologically dependent activities; this reality is ...

Corona, Erick (Erick Gustavo)

2013-01-01T23:59:59.000Z

388

Design of the Wireless Temperature Measurement Alarming System in the High-Voltage Transformer Substation  

Science Journals Connector (OSTI)

Due to electric power overload and equipment aging, fire and explosion occur at transmission circuitry joints in high-voltage transformer substation caused by high temperatures accumulated at these...

Qiang Gao; Hongli Wang; Huaxiang Wang

2008-01-01T23:59:59.000Z

389

Fuzzy Control on Voltage/Reactive Power in Electric Power Substation  

Science Journals Connector (OSTI)

A fuzzy method using in voltage and reactive power control in electric substation is proposed based on the improved 17 ... times at the tap positions of transformers in substation are much less than usual. So,...

Xiu-hua Wu; Jun-cheng Wang; Ping Yang…

2009-01-01T23:59:59.000Z

390

A multilevel energy buffer and voltage modulator for grid-interfaced micro-inverters  

E-Print Network (OSTI)

Micro-inverters operating into the single-phase grid from solar photovoltaic (PV) panels or other low-voltage sources must buffer the twice-line-frequency variations between the energy sourced by the PV panel and that ...

Chen, Minjie

391

STATCOM-based voltage and frequency regulator for stand-alone asynchronous generator  

Science Journals Connector (OSTI)

This paper presents a STATCOM-based voltage and frequency regulation for stand-alone asynchronous generator feeding linear and nonlinear loads. The SEIG have inherent poor voltage and frequency regulation. The voltage and frequency depend upon the load current and power factor of the load with fixed excitation capacitor employing unregulated turbines. The changing consumer load requires variable reactive power compensation for excitation requirement. Consumer load contains harmonics and performance of SEIG is largely affected by these load harmonics. A current controlled voltage source inverter working as STATCOM is used for harmonic elimination, load balancing and variable reactive power compensation. A DC chopper with dump load is connected across DC bus capacitor to regulate varying consumer load. The control algorithm has been first co-simulated with processor in the loop (PIL) and then experimentally validated. The transient behaviour of developed prototype system for application and removal of balanced, unbalanced, nonlinear load is investigated.

Dheeraj Kumar Palwalia

2014-01-01T23:59:59.000Z

392

The current-voltage characteristic of a hot-cathode electric arc at low pressures  

Science Journals Connector (OSTI)

It has been shown that in a hot-cathode electric arc operating at low pressures of the working ... drop arises that results in an increase in discharge voltage with current even before the transition of the discharge

C. P. Nikulin

2011-03-01T23:59:59.000Z

393

Nonlinear DSTATCOM controller design for distribution network with distributed generation to enhance voltage stability  

E-Print Network (OSTI)

Nonlinear DSTATCOM controller design for distribution network with distributed generation Accepted 19 June 2013 Keywords: Distributed generation Distribution network DSATACOM Partial feedback connected to a distribution network with distributed generation (DG) to regulate the line voltage

Pota, Himanshu Roy

394

Comparison of resonant current regulators for DFIG during grid voltage distortion  

Science Journals Connector (OSTI)

We investigate two different kinds of resonant current regulators for a doubly fed induction generator (DFIG) under distorted grid voltage conditions: proportional ... part. Based on the mathematical model of DFIG

Yi-peng Song; Heng Nian

2013-12-01T23:59:59.000Z

395

Dynamic modeling and direct power control of wind turbine driven DFIG under unbalanced network voltage conditions  

Science Journals Connector (OSTI)

This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the po...

Jia-bing Hu; Yi-kang He; Lie Xu

2008-12-01T23:59:59.000Z

396

In Vivo Voltage-Sensitive Dye Optical Functional Imaging of the Subcortical Brain  

Science Journals Connector (OSTI)

We combined voltage-sensitive dye imaging (VSDi) with gradient-index (GRIN) rod lens to study neural functions in mice vibrissae system. Neural activities evoked in the thalamic...

Tang, Qinggong; Tsytsarev, Vassiliy; Liang, Chia-Pin; Erzurumlu, Reha; Chen, Yu

397

Electrical aging of stator insulation of low voltage rotating machines supplied by inverters  

SciTech Connect

Nowadays, use of inverters for speed variation of low voltage motors becomes more and more usual. The most common technology for this kind of apparatus uses the Pulse Width Modulation (PWM). It is characterized by a square voltage shape with short rise and fall times. In order to insure the quality of turn to ground insulation submitted to these constraints, a study on the aging of Polyethylene terephthalate (Mylar{trademark}) has been undertaken. Influence of rise and fall times, frequency and voltage magnitude has been investigated for time duration up to 1,000 hours. To realize a good voltage application, samples were previously metalized. Two different behaviors according to the rise time and magnitude are observed. For long rise and fall times, changes in the capacity values are obtained although, for smaller rise or fall times, a degradation of the metalized electrode appears. A surface charge generation process is discussed to explain this phenomena.

Bellomo, J.P.; Lebey, T. [Lab. Genie Electrique de Toulouse (France); Oraison, J.M.; Peltier, F. [Leroy-Somer, Angouleme (France)

1996-12-31T23:59:59.000Z

398

Harmonic control of multiple-stator induction machines for voltage regulation  

E-Print Network (OSTI)

Small, one to a few horsepower, three-phase induction machines with three sets of electrically-isolated, magnetically-coupled stator winding circuits are described. A voltage inverter is developed and used to drive one set ...

Holloway, Jack Wade, 1980-

2004-01-01T23:59:59.000Z

399

Low-voltage, low-power circuits for data communication systems  

E-Print Network (OSTI)

There are growing industrial demands for low-voltage supply and low-power consumption circuits and systems. This is especially true for very high integration level and very large scale integrated (VLSI) mixed-signal chips and system...

Chen, Mingdeng

2005-02-17T23:59:59.000Z

400

Current mode integrators and their applications in low-voltage high frequency CMOS signal processing  

E-Print Network (OSTI)

Low voltage CMOS fully differential integrators for high frequency continuous-time filters using current-mode techniques are presented.. Current mode techniques are employed to avoid the use of the floating differential pair, in order to achieve...

Smith, Sterling Lane

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Electron Energy Analysis of Vacuum Discharge in High-Voltage Accelerator Tube  

Science Journals Connector (OSTI)

......measurement of the electron energy spectrum during discharge adds some new knowledge to the total voltage...authors sincerely thank Electron Energy Analysis of Vacuum Discharge...Physics, Academic Press, New York, Vol. 6, p. 297. 25......

Akio TAKAOKA; Katsumi URA; Kiyokazu YOSHIDA

1982-01-01T23:59:59.000Z

402

Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting  

DOE Patents (OSTI)

The electrode gap of a VAR is monitored by determining the skewness of a distribution of gap voltage measurements. A decrease in skewness indicates an increase in gap and may be used to control the gap. 4 figs.

Williamson, R.L.; Zanner, F.J.; Grose, S.M.

1998-01-13T23:59:59.000Z

403

State-of-the-Art Fuel Cell Voltage Durability Status: Spring 2013 Composite Data Products  

SciTech Connect

This presentation from the U.S. Department of Energy's National Renewable Energy Laboratory includes composite data products (CDPs) produced in 2013 for state-of-the-art fuel cell voltage durability status.

Kurtz, J.; Sprik, S.; Saur, G.; Peters, M.; Post, M.; Ainscough, C.

2013-05-01T23:59:59.000Z

404

Low Cost SiOx-Graphite and High Voltage Spinel Cathode | Department...  

Office of Environmental Management (EM)

Cathode Low Cost SiOx-Graphite and High Voltage Spinel Cathode 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation...

405

Analysis of three-phase rectifiers with constant-voltage loads  

E-Print Network (OSTI)

This work presents a quantitative analysis of the operating characteristics of three-phase diode bridge rectifiers with AC-side reactance and constant-voltage loads. We focus on the case where the AC-side currents vary ...

Caliskan, Vahe

406

High-voltage pulsed discharge in an electron source with a plasma cathode  

Science Journals Connector (OSTI)

The nature of and mechanism for producing a high-voltage discharge in an electron source with a plasma cathode are investigated. The possibility of generating pulsed electron currents with an amplitude of 103–104

S. P. Bugaev; F. Ya. Zagulov

1973-10-01T23:59:59.000Z

407

On the Simulation of NBTI-Induced Performance Degradation Considering Arbitrary Temperature and Voltage Variations  

Science Journals Connector (OSTI)

With aggressive CMOS technology scaling, Negative Bias Temperature Instability (NBTI) has emerged as one of the major system lifetime reliability threats, which gradually increases PMOS transistor threshold voltage and hence results in increased circuit ...

Ting Wang, Qiang Xu

2014-06-01T23:59:59.000Z

408

Manufacturing challenges of optical current and voltage sensors for utility applications  

SciTech Connect

Measurement of voltages and currents in power transmission and distribution systems are critical to the electric utility industry for both revenue metering and reliability. Nonconventional instrument transformers based on intensity modulation of optical signals have been reported in the literature for more than 20 years. Recently described devices using passive bulk optical sensor elements include the Electro-Optic Voltage Transducer (EOVT) and Magneto-Optic Current Transducer (MOCT). These technologies offer substantial advantages over conventional instrument transformers in accuracy, optical isolation bandwidth, environmental compatibility, weight and size. This paper describes design and manufacturing issues associated with the EOVT and the Optical Metering Unit (OMU) recently introduced by ABB with field installation results presented for prototype units in the 345 kV and 420 kV voltage classes. The OMU incorporates an EOVT and MOCT to monitor the voltage and current on power transmission lines using a single free-standing device.

Yakymyshyn, C.P. [Montana State Univ., Bozeman, MT (United States). Dept. of Electrical and Computer Engineering; Brubaker, M.A. [Los Alamos National Lab., NM (United States); Johnston, P.M. [Johnston (Paul M.), Raleigh, NC (United States); Reinbold, C. [ABB High Voltage Switchgear, Greensburg, PA (United States)

1997-12-01T23:59:59.000Z

409

Alternative Fuels Data Center: Regional Climate Change Initiative  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Regional Climate Regional Climate Change Initiative to someone by E-mail Share Alternative Fuels Data Center: Regional Climate Change Initiative on Facebook Tweet about Alternative Fuels Data Center: Regional Climate Change Initiative on Twitter Bookmark Alternative Fuels Data Center: Regional Climate Change Initiative on Google Bookmark Alternative Fuels Data Center: Regional Climate Change Initiative on Delicious Rank Alternative Fuels Data Center: Regional Climate Change Initiative on Digg Find More places to share Alternative Fuels Data Center: Regional Climate Change Initiative on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Regional Climate Change Initiative Governors of Oregon, Washington, and California approved a series of

410

Regional Planning | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Regional Planning Regional Planning Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov » Communities » Ocean Regional Planning Efforts Alias (field_alias) Apply California, Oregon, Washington Regional Ocean Partnership West Coast Governors' Alliance Regional Data Portal In Development U.S. Virgin Islands, Puerto Rico Regional Ocean Partnership U.S. Caribbean Regional Ocean Partnership-currently being formally established Regional Data Portal To be developed Georgia, Florida, North Carolina, South Carolina Regional Ocean Partnership Governors' South Atlantic Alliance Regional Data Portal Currently in development American Samoa, Commonwealth of the Northern Mariana Islands (CNMI), Federated States of Micronesia, Guam, Hawaii, Marshall Islands, Palau

411

the Regional Development Corporation  

NLE Websites -- All DOE Office Websites (Extended Search)

carry out this work, CPO partners carry out this work, CPO partners with the Los Alamos National Laboratory Foundation for education, the Regional Development Corporation for economic development, and the regional United Way organizations for community giving. Education Los Alamos National Security (LANS) invests more than $1 million each year to enhance regional educational opportunities in science, technology, engineering, and math (STEM) education. Education Focus Areas Our education commitments address four focus areas: * Workforce Development * Student Internships * Teacher and Faculty Professional Development * Public Understanding of Science In 2011, more than 1,100 students

412

Types of Commissioning  

Energy.gov (U.S. Department of Energy (DOE))

Several commissioning types exist to address the specific needs of equipment and systems across both new and existing buildings. The following commissioning types provide a good overview.

413

Granuloma annulare, patch type  

E-Print Network (OSTI)

Granuloma annulare, patch type Frank C Victor MD, Stephaniewas consistent with patch-type granuloma annulare. He wascm, annular, erythematous patch without scale was present on

Victor, Frank C; Mengden, Stephanie

2008-01-01T23:59:59.000Z

414

Novel passive lossless turn-on snubber for voltage source inverters  

SciTech Connect

A novel passive lossless turn-on snubber with a soft clamped turn-off snubber circuit for voltage source inverters is proposed. The energy trapped in the snubber is recovered into the dc supply and load without any active devices, associated control circuitry, or resistors. The overshoot voltage on the switches is clamped, and the peak switch current is low, making this snubber suitable for use in high-power insulated gate bipolar transistor (IGBT) inverters.

He, X.; Qian, Z.M. [Zhejiang Univ., Hangzhou (China). Dept. of Electrical Engineering; Finney, S.J.; Williams, B.W. [Heriot-Watt Univ., Edinburgh (United Kingdom). Dept. of Computing and Electrical Engineering

1997-01-01T23:59:59.000Z

415

Hybrid integrated active antennas, voltage-controlled oscillators and switchable & tunable CPW-slotline filters  

E-Print Network (OSTI)

HYBRID INTEGRATED ACTIVE ANTENNAS, VOLTAGE-CONTROLLED OSCILLATORS AND SWITCHABLE & TUNABLE CPW-SLOTLINE FILTERS A Thesis by JULIO ANGEL NAVARRO Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 1990 Major Subject: Electrical Engineering HYBRID INTEGRATED ACTIVE ANTENNAS, VOLTAGE-CONTROLLED OSCILLATORS AND SWITCHABLE 2 TUNABLE CPW-SLOTLINE FILTERS A Thesis by JULIO ANGEL NAVARRO...

Navarro, Julio A

1990-01-01T23:59:59.000Z

416

Non-transposed, three phase transmission lines: a study of their effect on load voltages.  

E-Print Network (OSTI)

TRANSMISSION LINES A S'PJDY OF THEIR EFFECT ON LOAD VOLTAGES A Thesis By Robert Dean Chenoweth August 1951 NON-TRANSPOSED~ THREE PHASE TRANSMISSION LINES A STUDY OF THEIR EFFECT ON LOAD VOLTAGES A Thesis Submitted to the Faculty of the Agricultural... all large blocks of alternating current power are transmitted from the generating station to the load by means of three phase transmission lines. With present day equipment this method is economical and when ~ properly designed gives very...

Chenoweth, Robert Dean

2012-06-07T23:59:59.000Z

417

High Voltage Testing of a 5-meter Prototype Triaxial HTS Cable  

SciTech Connect

High voltage tests were performed on a 5-m long prototype triaxial HTS cable (supplied by Ultera) at ORNL in preparation for installation of a 200-m HTS cable of the same design at the AEP utility substation in Columbus, Ohio. The triaxial design comprises three concentric phases and shield around a common former with the phase to phase dielectric at cryogenic temperature. Advantages of this design include increased current density, a reduced amount of HTS tape needed, and reduced heat load. The phase to phase voltage will be 13.2 kVrms (7.6 kVrms to ground). Preliminary testing was done on half-scale and full-scale terminations which successfully passed AC withstand, partial discharge, and impulse tests. High voltage tests conducted on the 5-m cable with the cable straight and after bending 90 degrees were ac withstand to 39 kVrms, partial discharge inception, and a minimum of 10 positive and 10 negative lightning waveform impulses at 110 kV. Phase to phase insulation was tested by applying high voltage to each phase one at a time with all the other phases grounded. Partial discharge data will be presented. The 5-m prototype triaxial HTS cable passed all the HV tests performed, with a PD inception voltage significantly above the required voltage.

Sauers, Isidor [ORNL; James, David Randy [ORNL; Ellis, Alvin R [ORNL; Tuncer, Enis [ORNL; Pace, Marshall O [ORNL; Gouge, Michael J [ORNL; Demko, Jonathan A [ORNL; Lindsay, David T [ORNL

2007-01-01T23:59:59.000Z

418

Regional and Global Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Products > Regional/Global Products > Regional/Global Regional and Global Data Biogeochemical Dynamics Data Regional and global biogeochemical dynamics data can be used to improve our understanding of the structure and function of various ecosystems; to enable prediction across spatial and temporal scales; and to parameterize and validate terrestrial ecosystem models. The ORNL DAAC compiles, archives, and distributes more than 150 products from the following projects: Climate Collections Hydroclimatology Collections ISLSCP II Project Net Primary Productivity (NPP) River Discharge (RIVDIS) Russian Land Cover (RLC) Soil Collections Vegetation Collections Vegetation-Ecosystem Modeling (VEMAP) Climate Collections Climate collections include measured and modeled values for variables such as temperature, precipitation, humidity, radiation, wind velocity, and

419

Regional Districts (Texas)  

Energy.gov (U.S. Department of Energy (DOE))

Adjacent Water Control and Improvement Districts and Municipal Utility Districts can opt to form a Regional District to oversee water issues. Such districts may be created:(1) to purchase, own,...

420

Types of Costs Types of Cost Estimates  

E-Print Network (OSTI)

first cost or capital investment): ­ Expenditures made to acquire or develop capital assets ­ Three main· Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408: Mining-site management or corporate level expenditure · Direct vs. Indirect Costs ­ Direct (or variable) costs apply

Boisvert, Jeff

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Types of Costs Types of Cost Estimates  

E-Print Network (OSTI)

-Revenue Relationships · Capital Costs (or first cost or capital investment): ­ Expenditures made to acquire or develop05-1 · Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408 ­ off-site management or corporate level expenditure · Direct vs. Indirect Costs ­ Direct (or variable

Boisvert, Jeff

422

G Protein-Gated Inhibitory Module of N-Type (CaV2.2) Ca2+ Channels  

Science Journals Connector (OSTI)

Summary Voltage-dependent G protein (G??) inhibition of N-type (CaV2.2) channels supports presynaptic inhibition and represents a central paradigm of channel modulation. Still controversial are the proposed determinants for such modulation, which reside on the principal ?1B channel subunit. These include the interdomain I-II loop (I-II), the carboxy tail (CT), and the amino terminus (NT). Here, we probed these determinants and related mechanisms, utilizing compound-state analysis with yeast two-hybrid and mammalian cell FRET assays of binding among channel segments and G proteins. Chimeric channels confirmed the unique importance of NT. Binding assays revealed selective interaction between NT and I-II elements. Coexpressing NT peptide with G?? induced constitutive channel inhibition, suggesting that the NT domain constitutes a G protein-gated inhibitory module. Such inhibition was limited to NT regions interacting with I-II, and G-protein inhibition was abolished within ?1B channels lacking these NT regions. Thus, an NT module, acting via interactions with the I-II loop, appears fundamental to such modulation.

Heather L. Agler; Jenafer Evans; Lai Hock Tay; Molly J. Anderson; Henry M. Colecraft; David T. Yue

2005-01-01T23:59:59.000Z

423

North County Regional Resource Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

Regional Resource Biomass Facility Regional Resource Biomass Facility Jump to: navigation, search Name North County Regional Resource Biomass Facility Facility North County Regional Resource Sector Biomass Facility Type Municipal Solid Waste Location Palm Beach County, Florida Coordinates 26.6514503°, -80.2767327° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":26.6514503,"lon":-80.2767327,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

424

Stockton Regional Water Control Facility Biomass Facility | Open Energy  

Open Energy Info (EERE)

Stockton Regional Water Control Facility Biomass Facility Stockton Regional Water Control Facility Biomass Facility Jump to: navigation, search Name Stockton Regional Water Control Facility Biomass Facility Facility Stockton Regional Water Control Facility Sector Biomass Facility Type Non-Fossil Waste Location San Joaquin County, California Coordinates 37.9175935°, -121.1710389° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.9175935,"lon":-121.1710389,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

425

U.S. EPA Region 9 | Open Energy Information  

Open Energy Info (EERE)

Logo: U.S. EPA Region 9 Logo: U.S. EPA Region 9 Name U.S. EPA Region 9 Address 75 hawthorne st Place San Francisco, California Zip 94105 Region Bay Area Number of employees 501-1000 Website http://epa.gov/region9/ Coordinates 37.7853°, -122.398274° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.7853,"lon":-122.398274,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

426

Regional 166 Direct Loan (Ohio) | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Regional 166 Direct Loan (Ohio) Regional 166 Direct Loan (Ohio) Regional 166 Direct Loan (Ohio) < Back Eligibility Agricultural Commercial Construction Fuel Distributor Industrial Installer/Contractor Systems Integrator Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Maximum Rebate $350,000 Program Info State Ohio Program Type Loan Program Provider Ohio Department of Development The Ohio Development Services Agency's (ODSA) Regional 166 Direct Loan provides low-interest loans to businesses creating new jobs or preserving existing employment opportunities in the State of Ohio. Eligible projects include those related to industry, commerce, distribution or research activities. Retail projects are ineligible for the Regional 166

427

NREL/OAS-Regional Building Efficiency Workshop | Open Energy Information  

Open Energy Info (EERE)

NREL/OAS-Regional Building Efficiency Workshop NREL/OAS-Regional Building Efficiency Workshop < NREL Jump to: navigation, search Tool Summary LAUNCH TOOL Name: NREL/OAS-Regional Building Efficiency Workshop Agency/Company /Organization: National Renewable Energy Laboratory, Organization of American States (OAS) Sector: Energy Focus Area: Buildings, Buildings - Commercial, Buildings - Residential, Water Conservation Resource Type: Presentation, Training materials, Online calculator Website: www.nrel.gov/international/ Language: English References: NREL/OAS-Regional Building Efficiency Workshop[1] "NREL/OAS staff held a regional four-day training workshop to provide selected personnel with detailed knowledge of how to conduct a building efficiency audit. Topics covered included lighting, water conservation,

428

Regional Retail Gasoline Prices  

Gasoline and Diesel Fuel Update (EIA)

7 7 Notes: Retail gasoline prices, like those for distillate fuels, have hit record prices nationally and in several regions this year. The national average regular gasoline price peaked at $1.68 per gallon in mid-June, but quickly declined, and now stands at $1.45, 17 cents higher than a year ago. Two regions, in particular, experienced sharp gasoline price runups this year. California, which often has some of the highest prices in the nation, saw prices peak near $1.85 in mid-September, while the Midwest had average prices over $1.87 in mid-June. Local prices at some stations in both areas hit levels well over $2.00 per gallon. The reasons for the regional price runups differed significantly. In the Midwest, the introduction of Phase 2 RFG was hampered by low stocks,

429

regional | OpenEI  

Open Energy Info (EERE)

regional regional Dataset Summary Description The UK Department of Energy and Climate Change (DECC) releases annual statistics on domestic and industrial/commercial electricity and gas consumption (and number of meters) at the Middle Layer Super Output Authority (MLSOA) and Intermediate Geography Zone (IGZ) level (there are over 950 of these subregions throughout England, Scotland and Wales). Both MLSOAs (England and Wales) and IGZs (Scotland) include a minimum of approximately 2,000 households. Source UK Department of Energy and Climate Change (DECC) Date Released March 01st, 2008 (6 years ago) Date Updated Unknown Keywords Electricity Consumption gas regional UK Data application/zip icon Guidance document for interpreting data (zip, 1.2 MiB) application/vnd.ms-excel icon Excel file: 2005 MLSOA and IGZ gas and electricity (xls, 10 MiB)

430

Establishing Regional Resource Centers  

Wind Powering America (EERE)

Establishing Regional Resource Centers Establishing Regional Resource Centers July 25, 2013 Coordinator: Welcome and thank you for standing by. At this time all participants are in a listen only mode. To ask a question later during the question and answer session please press star then 1 on your touchtone phone. Today's conference is being recorded. If you have any objections you may disconnect. And I would like to turn it over to Mr. Jonathan Bartlett. Sir, you may begin. Jonathan Bartlett: Thank you very much. This is Jonathan Bartlett from the Department of Energy's Wind and Water Power Technologies Office. Today's WPA Webinar will be on the subject of establishing regional resource centers. I will be joined by Ian Baring-Gould at the National Renewable Energy Laboratory and the

431

Regional White Matter and Neuropsychological Functioning across the Adult Lifespan  

E-Print Network (OSTI)

Regional White Matter and Neuropsychological Functioning across the Adult Lifespan Adam M. Brickman (MRI) to more fully elucidate the relationship among age, regional white matter, and neuropsychological neuropsychological assessment. MR images were spatially normalized and segmented by tissue type; relative white

432

Experimental research on the feature of Talbot-Lau interferometer vs. tube accelerating voltage  

E-Print Network (OSTI)

Talbot-Lau interferometer has been used most widely to perform X-ray phase-contrast imaging with a conventional low-brilliance X-ray source, it yields high-sensitivity phase and dark-field images of sample producing low absorption contrast, thus bearing tremendous potential for future clinical diagnosis. In this manuscript, while changing accelerating voltage of the X-ray tube from 35KV to 45KV, X-ray phase-contrast imaging of a test sample were performed at each integer KV position to investigate the characteristic of a Talbot-Lau interferometer (located in the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan.) vs. tube voltage. Experimental results and data analysis show that this Talbot-Lau interferometer is insensitive to the tube accelerating voltage within a certain range, fringe visibility around 44% is maintained in the aforementioned tube voltage range. This experimental research is of guiding significance for choosing optimal tube accelerating voltage with thi...

Wang, Shenghao; Wang, Zhili; Gao, Kun; Zhang, Kai; Momose, Atsushi; Wu, Ziyu

2014-01-01T23:59:59.000Z

433

An expert system for voltage control in a power system network  

SciTech Connect

This paper presents a prototype of an expert system for alleviation of voltage violations in the day-to-day operation of large power networks. Voltage control for varying load and generation conditions can be achieved by co-ordinated control of switchable shunt VAR compensating (SVC) devices and On load transformer taps (OLTC), while generator excitations are used in dynamic control of voltage profile. This paper deals with the development of an expert system for voltage corrections for base case and contingency conditions using switchable shunt reactive compensation and transformer tap settings. The performance of the expert system is compared with the conventional optimization technique of voltage control and concurrent results have been obtained. The proposed expert system has been tested with simulated conditions of a few practical power systems. Results obtained for a 24 bus EHV Indian power network have been included for illustration purpose. The expert system is found to be suitable for on-line application in Energy Control Center as the solution is obtained very fast.

Bansilal; Thukaram, D.; Parthasarathy, K. [Indian Inst. of Science, Bangalore (India). Dept. of Electrical Engineering

1995-12-31T23:59:59.000Z

434

Northeast Region Standardized Bycatch  

E-Print Network (OSTI)

Flexibility Act Assessment, and a Regulatory Impact Review June 2007 Prepared by the New England Fishery Management Plans of the Mid-Atlantic and New England Regional Fishery Management Councils June 2007 #12;This Management Plan (FMP); Amendment 2 to the Atlantic Herring FMP; Amendment 2 to the Atlantic Salmon FMP

435

architecture architecture urban & regional  

E-Print Network (OSTI)

in architectural design, history, building construction, structures, and environmental technology from ourlandscape architecture architecture urban & regional planning environment + design college of fine-disciplinary studies. 18-to-1 Student-Teacher Ratio You'll enjoy individual, one-on-one attention in your architecture

Hwu, Wen-mei W.

436

Types of Hydropower Plants  

Energy.gov (U.S. Department of Energy (DOE))

There are three types of hydropower facilities: impoundment, diversion, and pumped storage. Some hydropower plants use dams and some do not. The images below show both types of hydropower plants.

437

A Method to Improve Voltage Holding Across Vacuum Electrical Gaps to  

NLE Websites -- All DOE Office Websites (Extended Search)

A Method to Improve Voltage Holding Across Vacuum Electrical Gaps to A Method to Improve Voltage Holding Across Vacuum Electrical Gaps to Improve the Performance and Reduce the Conditioning Time by Removing Bacteria, Fungi, and Other Microbial Organisms and Their Spores. -- . Inventor Larry Grisham. Disclosed is a method to potentially increase the performance of devices which employ electric field within a vacuum by increasing the magnitude of the electric field gradient which can be sustained, the reliability of the devices, and by reducing the conditioning time of devices such as charged particle accelerators when they are brought into operation. The disclosed method can be employed, for example, for devices requiring voltages across vacuum gaps, such as, but not limited to, charged particle accelerators, X-ray machines, vacuum tubes, and vacuum electrical breakers.

438

Optimizing performance per watt on GPUs in High Performance Computing: temperature, frequency and voltage effects  

E-Print Network (OSTI)

The magnitude of the real-time digital signal processing challenge attached to large radio astronomical antenna arrays motivates use of high performance computing (HPC) systems. The need for high power efficiency (performance per watt) at remote observatory sites parallels that in HPC broadly, where efficiency is an emerging critical metric. We investigate how the performance per watt of graphics processing units (GPUs) is affected by temperature, core clock frequency and voltage. Our results highlight how the underlying physical processes that govern transistor operation affect power efficiency. In particular, we show experimentally that GPU power consumption grows non-linearly with both temperature and supply voltage, as predicted by physical transistor models. We show lowering GPU supply voltage and increasing clock frequency while maintaining a low die temperature increases the power efficiency of an NVIDIA K20 GPU by up to 37-48% over default settings when running xGPU, a compute-bound code used in radio...

Price, D C; Barsdell, B R; Babich, R; Greenhill, L J

2014-01-01T23:59:59.000Z

439

Efficient Computation of Sensitivity Coefficients of Node Voltages and Line Currents in Unbalanced Electrical Networks  

E-Print Network (OSTI)

The problem of optimal control of power distribution systems is becoming increasingly compelling due to the progressive penetration of distributed energy resources in this specific layer of the electrical infrastructure. Distribution systems are, indeed, experiencing significant changes in terms of operation philosophies that are often based on optimal control strategies relying on the computation of linearized dependencies between controlled (e.g. voltages) and control variables (e.g. power injections). As the implementation of these strategies in real-time controllers imposes stringent time constraints, the derivation of analytical dependency between controlled and control variables becomes a non-trivial task to be solved. With reference to optimal voltage and power flow controls, this paper aims at providing an analytical derivation of node voltage and line current flows as a function of the nodal power injections. Compared to other approaches presented in the literature, the one proposed here is based on ...

Christakou, Konstantina; Paolone, Mario; Tomozei, Dan-Cristian

2012-01-01T23:59:59.000Z

440

Multilevel-Dc-Bus Inverter For Providing Sinusoidal And Pwm Electrical Machine Voltages  

DOE Patents (OSTI)

A circuit for controlling an ac machine comprises a full bridge network of commutation switches which are connected to supply current for a corresponding voltage phase to the stator windings, a plurality of diodes, each in parallel connection to a respective one of the commutation switches, a plurality of dc source connections providing a multi-level dc bus for the full bridge network of commutation switches to produce sinusoidal voltages or PWM signals, and a controller connected for control of said dc source connections and said full bridge network of commutation switches to output substantially sinusoidal voltages to the stator windings. With the invention, the number of semiconductor switches is reduced to m+3 for a multi-level dc bus having m levels. A method of machine control is also disclosed.

Su, Gui-Jia [Knoxville, TN

2005-11-29T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Voltage and Frequency Control in Offshore Wind Turbines Connected to Isolated Oil Platform Power Systems  

Science Journals Connector (OSTI)

Offshore wind turbines have potential to supply offshore oil and gas platforms in the North Sea with electric energy. For remote located facilities it is attractive to pursue a solution where the wind turbines and oil platform operate in an isolated system. To study the operational properties of a system with these characteristics is necessary to identify possible advantages and disadvantages. This paper demonstrates how added voltage and frequency control in wind turbines equipped with full power electronic converters can improve the voltage and frequency stability in offshore oil and gas installations. The work is based on an electrical simulation model built in the PSCAD software. In the proposed transient simulation scenarios, the voltage dip is reduced from 16% to 6%, while the frequency overshoot is reduced from 97% to 25%. These are significant improvements that should be taken into consideration when offshore wind power is evaluated as power supply to oil installations.

Atle Rygg Årdal; Tore Undeland; Kamran Sharifabadi

2012-01-01T23:59:59.000Z

442

STATCOM based voltage-frequency regulation for SEIG driven by an uncontrolled speed turbine  

Science Journals Connector (OSTI)

This article presents the analysis and the control of a stand-alone self excited induction generator (SEIG) intended for rural applications. SEIG along with the STATCOM with battery energy storage (BES) in its DC side makes it possible to control the terminal voltage and frequency during rotor speed and load variation. Constant frequency control is carried out by the load angle '?', without rotor speed control, while constant terminal voltage control is achieved via the modulation index 'm'. The 'SEIG' magnetisation characteristic and the 'STATCOM' rating are taken into consideration to determine the load interval where the terminal voltage and frequency can be controlled. The simulation results show good performances of the SEIG-STATCOM system under different perturbations.

Azzeddine Benlamoudi; Rachid Abdessemed

2009-01-01T23:59:59.000Z

443

Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells  

SciTech Connect

Defect states influence the operation of organic solar cells altering transport, recombination, and energetic mechanisms. This work investigates how processing conditions induce morphology-related, electrically active defects in the donor polymer of bulk-heterojunction solar cells. Structural order is inferred from absorption and X-ray diffraction data, while defect density is determined from capacitance methods. A correlation is observed between the polymer nanocrystallite size, the defect concentration, and the output voltage. For the case of poly(3-hexylthiophene), processing that promote crystallinity is beneficial for the device performance as it decreases the defect density (energy disorder) that finally enlarges the maximum achievable open-circuit voltage. Defect states within the effective bandgap modulate the downshift of the hole Fermi level upon illumination that in turn establishes the achievable open-circuit voltage.

Ripolles, Teresa S.; Guerrero, Antonio; Garcia-Belmonte, Germà, E-mail: garciag@uji.es [Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló (Spain)] [Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló (Spain)

2013-12-09T23:59:59.000Z

444

Fiber-optic voltage sensor with cladded fiber and evanescent wave variation detection  

DOE Patents (OSTI)

A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities. 3 figs.

Wood, C.B.

1992-12-15T23:59:59.000Z

445

Fiber-optic voltage sensor with cladded fiber and evanescent wave variation detection  

DOE Patents (OSTI)

A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities.

Wood, Charles B. (Lakewood, CO)

1992-01-01T23:59:59.000Z

446

Partial discharge measurements on a high voltage direct current mass impregnated paper cable  

SciTech Connect

Partial discharge measurement has been a good tool for the quality assurance of cables under alternating voltage. With the growing interest in High Voltage Direct Current cables it seems therefore logical to extend this technique for use at direct voltage. The paper describes this technique as used on a HVDC cable with mass impregnated paper. The different phases of operation (no load, full load, cooling phase, etc.) are characterized by a different discharge behavior. Special attention is given to the dangerous cooling phase. Models have been developed which can explain the discharge patterns that were measured. This paper gives an insight in the electrical behavior of a HVDC cable with mass impregnated paper insulation.

Jeroense, M.J.P. [NKF KABEL B.V., Delft (Netherlands); Kreuger, F.H. [Delft Univ. of Technology (Netherlands)

1996-12-31T23:59:59.000Z

447

Typing aspects for MATLAB  

Science Journals Connector (OSTI)

The MATLAB programming language is heavily used in many scientific and engineering domains. Part of the appeal of the language is that one can quickly prototype numerical algorithms without requiring any static type declarations. However, this lack of ... Keywords: MATLAB, dynamic type assertions, typing aspects

Laurie Hendren

2011-03-01T23:59:59.000Z

448

Property:Region | Open Energy Information  

Open Energy Info (EERE)

Region Region Jump to: navigation, search This is a property of type Page. Pages using the property "Region" Showing 25 pages using this property. (previous 25) (next 25) 1 1st Light Energy, Inc. + Southern CA Area + 2 21-Century Silicon, Inc. + Texas Area + 3 3Degrees + Bay Area + 3TIER + Pacific Northwest Area + 4 4th Day Energy + Southern CA Area + 5 5 boro biofuel + Northeast - NY NJ CT PA Area + @ @Ventures (California) + Bay Area + @Ventures (Massachusetts) + Greater Boston Area + A A1 Sun, Inc. + Bay Area + A10 Power + Bay Area + A123 Systems + Greater Boston Area + A2BE Carbon Capture LLC + Rockies Area + ABC Solar, Inc. + Southern CA Area + ABS Alaskan Inc + United States + AC Solar Inc + Rockies Area + AEE Solar + Bay Area + AER NY Kinetics LLC + United States +

449

Unidirectional anisotropy in the spin pumping voltage in yttrium iron garnet/platinum bilayers  

SciTech Connect

Detailed measurements of the dc voltage generated in a thin Pt layer deposited on films of yttrium iron garnet (YIG) have been carried out to study the spin pumping effect produced by magnetostatic (MS) modes excited by a microwave field. In relatively thick YIG films the modes are far apart so that one can identify clearly the spin pumping voltage in V{sub SP} produced by each MS mode. We have discovered that when the sputter deposition of the thin Pt layer is made on the YIG film magnetized by a static magnetic field, V{sub SP} exhibits a strong unidirectional anisotropy.

Vilela-Leao, L. H.; Salvador, C.; Azevedo, A.; Rezende, S. M.

2011-09-05T23:59:59.000Z

450

High voltage capability electrical coils insulated with materials containing SF.sub.6 gas  

DOE Patents (OSTI)

A coil is made having a plurality of layers of adjacent metal conductor windings subject to voltage stress, where the windings have insulation therebetween containing a small number of minute disposed throughout its cross-section, where the voids are voids filled with SF.sub.6 gas to substitute for air or other gaseous materials in from about 60% to about 95% of the cross-sectional void volume in the insulation, thus incorporating an amount of SF.sub.6 gas in the cross-section of the insulation effective to substantially increase corona inception voltages.

Lanoue, Thomas J. (Muncie, IN); Zeise, Clarence L. (Penn Township, Allegheny County, PA); Wagenaar, Loren (Muncie, IN); Westervelt, Dean C. (Acme, PA)

1988-01-01T23:59:59.000Z

451

Room-temperature atmospheric argon plasma jet sustained with submicrosecond high-voltage pulses  

SciTech Connect

In this letter, an experimental study is presented to characterize a room-temperature plasma jet in atmospheric argon generated with submicrosecond voltage pulses at 4 kHz. Distinct from sinusoidally produced argon discharges that are prone to thermal runaway instabilities, the pulsed atmospheric argon plasma jet is stable and cold with an electron density 3.9 times greater than that in a comparable sinusoidal jet. Its optical emission is also much stronger. Electrical measurement suggests that the discharge event is preceded with a prebreakdown phase and its plasma stability is facilitated by the short voltage pulses.

Walsh, J. L.; Kong, M. G. [Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU (United Kingdom)

2007-11-26T23:59:59.000Z

452

Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement  

DOE Patents (OSTI)

A method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet. 4 figs.

Kikta, T.J.; Mitchell, R.D.

1992-11-24T23:59:59.000Z

453

Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement  

DOE Patents (OSTI)

A method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet.

Kikta, Thomas J. (Pittsburgh, PA); Mitchell, Ronald D. (Pittsburgh, PA)

1992-01-01T23:59:59.000Z

454

Geothermal Regions | Open Energy Information  

Open Energy Info (EERE)

Regions Regions Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Regions RegionsMap2012.jpg Geothermal regions were outlined for the western United States (including Alaska and Hawaii) to identify geothermal areas, projects, and exploration trends for each region. These regions were developed based on the USGS physiographic regions (U.S. Geological Survey), and then adjusted to fit geothermal exploration parameters such as differences in geologic regime, structure, heat source, surface effects (weather, vegetation patterns, groundwater flow), and other relevant factors. The 21 regions can be seen outlined in red and overlain on the 2008 USGS Geothermal Favorability Map in Figure 1.[1] Add a new Geothermal Region List of Regions Area (km2) Mean MW

455

Interaction Region Papers  

NLE Websites -- All DOE Office Websites (Extended Search)

IR (Interaction Region) Magnets with Ramesh Gupta IR (Interaction Region) Magnets with Ramesh Gupta as the major author (unless noted): R. Gupta, et. al, "React & Wind Nb3Sn Common Coil Dipole", ASC 2006, August 27- September 1, 2006 in Seattle, WA, USA . *** Click Here for Talk ***. R. Gupta, "Modular Design and Modular Program for High Gradient Quadrupoles", ASC 2006, August 27- September 1, 2006 in Seattle, WA, USA. *** Click Here for Poster ***. Racetrack Magnet Designs and Technologies, WAMDO@CERN, April 2-6, 2006 (Click here for the oral presentation). R. Gupta, et. al, "Optimization of Open Midplane Dipole Design for LHC IR Upgrade," Presented at the 2005 Particle Accelerator Conference, Knoxville, TN, USA (2005). *** Click Here for Poster *** R. Gupta, et al., “Open Midplane Dipole Design for LHC IR

456

Regional University Alliance  

NLE Websites -- All DOE Office Websites (Extended Search)

Alliance Alliance Developed by the National Energy Technology Laboratory in collaboration with NETL-Regional University Alliance WVU National Research Center for Coal and Energy Fossil Consulting Services, Inc. The AVESTAR(tm) Center provides a state-of- the-art, highly realistic, dynamic simulator for a coal-fired power plant using Integrated Gasification Combined Cycle (IGCC) technology with CO 2 capture. The system is based on Invensys' DYNSIM ® software

457

Northwest Regional Meeting  

Science Journals Connector (OSTI)

Northwest Regional Meeting ... Organizers are planning symposia on instrumental experiments in the general chemistry laboratory, active learning in chemical education, bio-based products, environmental molecular sciences laboratory user research, green chemistry, Hanford site analytical chemistry, management of the chemical enterprise, noninvasive diagnostics, radioisotopes and radiopharmaceuticals, semiconductor materials, the chemistry of advanced nuclear systems, thermodynamic models in geochemistry, sensors and sensor technology, women in chemistry, agricultural and public health protection chemistry, and public response to chemical exposure emergencies. ...

2007-02-12T23:59:59.000Z

458

Bayshore Regional Sewerage Authority (BRSA) | Open Energy Information  

Open Energy Info (EERE)

Bayshore Regional Sewerage Authority (BRSA) Bayshore Regional Sewerage Authority (BRSA) Jump to: navigation, search Name Bayshore Regional Sewerage Authority (BRSA) Facility Bayshore Regional Sewerage Authority (BRSA) Sector Wind energy Facility Type Community Wind Facility Status Proposed Owner Bayshore Regional Sewerage Authority (BRSA) Developer Bayshore Regional Sewerage Authority (BRSA) Energy Purchaser Bayshore Regional Sewerage Authority (BRSA) Location Union Beach NJ Coordinates 40.4497613°, -74.1764619° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.4497613,"lon":-74.1764619,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

459

Regional Energy Deployment System (ReEDS) | Open Energy Information  

Open Energy Info (EERE)

Regional Energy Deployment System (ReEDS) Regional Energy Deployment System (ReEDS) (Redirected from Regional Energy Deployment System) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Regional Energy Deployment System Agency/Company /Organization: NREL Sector: Energy Topics: Pathways analysis, Resource assessment Resource Type: Software/modeling tools User Interface: Desktop Application Website: www.nrel.gov/analysis/reeds/ OpenEI Keyword(s): EERE tool, Regional Energy Deployment System, ReEDS References: Regional Energy Deployment System (ReEDS) Web site[1] Regional Energy Deployment System (ReEDS) is a multiregional, multitimeperiod, Geographic Information System (GIS), and linear programming model of capacity expansion in the electric sector of the United States. The model, developed by NREL's Strategic Energy Analysis

460

AEO2011: Electric Power Projections for EMM Region - Texas Regional Entity  

Open Energy Info (EERE)

Texas Regional Entity Texas Regional Entity Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is table 73, and contains only the reference case. The data is broken down into electric power sector, cumulative planned additions,cumulative unplanned additions,cumulative retirements, end-use sector, electricity sales, net energy for load, generation by fuel type and price by service category. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO EIA Electric Power projections Texas Data application/vnd.ms-excel icon AEO2011: Electric Power Projections for EMM Region - Texas Regional Entity - Reference Case (xls, 259.4 KiB)

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Design and operating characteristics of new type cold cathode ion source  

SciTech Connect

In this work, the design and performance of new type ion source are described. The discharge mechanism of the source is based on creating an arc discharge through a saddle electric field inside the discharge tube. The saddle electric field is created by immersing an annular anode inside the discharge tube covered from the upper and lower ends with two flanges. These two flanges act as cathodes. The discharge tube is surrounded by a solenoid coil which produces an axial magnetic field (up to 400 G) measured at the center of the source. Measurements have been performed to find out the influence of arc power, pressure, discharge voltage, magnetic field, and extracting voltage on the ion source properties. The source yields an argon ion current of {approx}0.6 mA and electron current of {approx}4 mA at normal operating conditions (extraction voltage V{sub ex}=7 kV, pressure of 5.5x10{sup -4} Torr, V{sub arc}=400 V, I{sub arc}=1 A, B=200 G). It showed an energy spread of 20 eV at a discharge voltage of 400 V and an extraction voltage of 3 kV.

Hassan, A.; Bassal, N.; Zakhary, S. G. [Accelerators and Ion Sources Department, NRC, AEA, AbuZaabal, Cairo 13759 (Egypt)

2007-12-15T23:59:59.000Z

462

Proposal of DC shield reactor type superconducting fault current limiter  

Science Journals Connector (OSTI)

Saturated DC reactor type superconducting fault current limiter (SFCL) had been proposed two years ago. It was classified to rectifier type SFCL. The changing inductance value with the operating mode has superior characteristics to reduce voltage sag during step increase of the load current. But it has the disadvantage of its weight. In this paper, rectifier type SFCL with shielded reactor has been proposed. The reactor which has superconducting ring or tube inside its winding is substituted to the DC link of the rectifier. The configuration looks like an air core transformer with secondary short winding. When the current through the bulk shield-ring reaches to a certain level, the flux penetrates to the shield body and finite impedance appears in the primary winding. In other words, when the surface flux density exceeds its critical flux density, the flux penetrates into the bulk superconductor, and increases equivalent inductance. The equivalent transient resistance of the shield was represented as a function of exponential of the time. Using this equivalent transient resistance, the transient impedance was expressed. The transient wave analysis using EMTDC (electro-magnetic transients in DC systems) has been described. Simulated waveforms are shown considering the source inductance, the leakage inductance, the coupling coefficient and the forward voltage drop of the semiconductor. And voltage sag was also investigated with 50% step load increase. Preliminary design was also performed. The coil size and number of turns are designed to obtain adequate inductance for the current limitation, and the central magnetic field of the coils are calculated. There is optimal aspect ratio to minimize the magnetic field with restriction in outer diameter of the coil.

Itsuya Muta; Tsutomu Hoshino; Khosru Mohammad Salim; Akio Kawasaki; Taketsune Nakamura; Masato Yamada

2004-01-01T23:59:59.000Z

463

The Influence of Catalysts on Discharge and Charge Voltages of Rechargeable Li–Oxygen Batteries  

E-Print Network (OSTI)

This study revealed the strong influence of carbon, Au/C, and Pt/C catalysts on the charge and discharge voltages of rechargeable Li–O[subscript 2] batteries. Li–O[subscript 2] single-cell measurements showed that Au/C had ...

Gasteiger, Hubert A.

464

Study of the electric field generated by the high voltage substations  

Science Journals Connector (OSTI)

The paper outlines the results of a study regarding the electromagnetic field generated by a 400 kV high voltage (HV) substation belonging to the Romanian national Power Grid Company Transelectrica SA. In the first part of the paper, a semi-analytical ... Keywords: HV substations, computation, electromagnetic field, human exposure, limits

Calin Munteanu; Vasile Topa; Marius Purcar; Laura Grindei; Adina Racasan

2010-10-01T23:59:59.000Z

465

Thermal Analysis and Optimization of 2.5-D Integrated Voltage Regulator  

E-Print Network (OSTI)

losses in the power distribution network, and by enabling power management with greater temporal at higher voltages, reducing resistive losses in the power distri- bution network, and by enabling fine in the IC and the inductor placed inside the interposer generate significant heat and affect the performance

Lim, Sung Kyu

466

Geomagnetically induced currents in the Uruguayan high-voltage power grid  

Science Journals Connector (OSTI)

......currents in the Uruguayan high-voltage power grid R. Caraballo 1 2 L. Sanchez Bettucci...simple topology of the Uruguayan power grid provides some advantages in the calculation...transformers at the South African power grid during the Halloween storm in 2003......

R. Caraballo; L. Sánchez Bettucci; G. Tancredi

2013-01-01T23:59:59.000Z

467

A Worst-Case Circuit Delay Verification Technique Considering Power Grid Voltage Variations  

E-Print Network (OSTI)

A Worst-Case Circuit Delay Verification Technique Considering Power Grid Voltage Variations then these critical paths we tie the supplies of the gates to physical power grids and re-analyze for the worst- case and report on the implementation results using benchmark circuits tied to a number of test-case power grids

Najm, Farid N.

468

Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation of Real  

E-Print Network (OSTI)

of a Mini-Hydro Power Generator to the Rural Grid The UK distribution network has been significantly exten1 Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation Control (APFC) modes. The ability to export active and reactive power from mini-hydro power generators

Harrison, Gareth

469

Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1  

E-Print Network (OSTI)

Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1 , Gabriele Michalke2) wind turbines address primarily the design of DFIG wind turbine control with special focus on power strategy for DFIG wind turbines, which enhances the fault ride-through capability of DFIG wind turbines

470

Quadratic voltage profiles in lead acid cells during slow, steady processes  

E-Print Network (OSTI)

It is standard lore that the voltage profile varies linearly in space within the electrolyte of a lead acid cell under slow, steady discharge. However, this hypothesis has never been put to the test. A recent theory predicts a uniform, non...

Haaser, Robert Anthony

1999-01-01T23:59:59.000Z

471

Creation of Onset Voltage Hash by Anode Spots in Magnetoplasmadynamic Thrusters  

E-Print Network (OSTI)

Creation of Onset Voltage Hash by Anode Spots in Magnetoplasmadynamic Thrusters Luke Uribarri and E (MPDTs) operating with three anode materials, and an anode spot model is presented which provides below and above onset with anodes of cop- per, graphite, and lead are analyzed using the statistical

Choueiri, Edgar

472

Capacitor Voltage Control in a Cascaded Multilevel Inverter as a Static Var Generator  

E-Print Network (OSTI)

1 Capacitor Voltage Control in a Cascaded Multilevel Inverter as a Static Var Generator M. Li, J. N for a cascaded multilevel inverter to be used for static var compensation. Index Terms-- Multilevel Inverter, Static Var Generator (SVG), Cascade inverter. I. INTRODUCTION Multilevel inverters have gained much

Tolbert, Leon M.

473

TCSC as a Transient Voltage Stabilizing Controller Garng Huang and Tong Zhu  

E-Print Network (OSTI)

drawback that infinitive bus is not a good model for a generator for voltage stability studies since only that the generator field current limiting action limits the output of the reactive power, which is essential performance are included in the test system. These elements include induction motors, on-load tap-changer t

474

Impact of High Wind Penetration on the Voltage Profile of Distribution Systems  

E-Print Network (OSTI)

that the inclusion of squirrel cage induction generator (SCIG) does not have a large influence on transient stability to the inability of induction generator to support the reactive power. So, the main objective of this study generation on the voltage profile in distribution systems have been presented. The analysis is carried out

Pota, Himanshu Roy

475

Coordination of Voltage and Frequency Feedback in Load-Frequency Control Capability of Wind Turbine  

E-Print Network (OSTI)

Coordination of Voltage and Frequency Feedback in Load-Frequency Control Capability of Wind Turbine-Frequency Control (LFC) is gradually shifted to Variable Speed Wind Turbines (VSWTs). In order to equip VSWT@et.aau.dk Abstract--In near future, with high penetration of Wind Energy (WE) in power system, the burden of Load

Silva, Filipe Faria Da

476

A high-gain adaptive observer for detecting Li-ion battery terminal voltage collapse  

Science Journals Connector (OSTI)

We use a high-gain adaptive observer and a trend filtering algorithm to detect early stages that lead to terminal voltage collapses in Li-ion batteries. This approach allows accurate detection without having sophisticated battery models. Theoretical ... Keywords: Adaptive filters, Adaptive systems, Detection algorithms, High-gain, Trend

Shayok Mukhopadhyay, Fumin Zhang

2014-03-01T23:59:59.000Z

477

TRANSIENT CURRENTSAM) VOLTAGES IN A POWER DISTRIBUTION SYSTEM DUE TO NATURAL LIGHTNING  

E-Print Network (OSTI)

July 1995, a lightning flash struck earth tens of meters away from the test system's conductors. On 11 of the test distribution system at ICLRT for the lightning flashes analyzed are given in Figs. 1 and 2TRANSIENT CURRENTSAM) VOLTAGES IN A POWER DISTRIBUTION SYSTEM DUE TO NATURAL LIGHTNING M

Florida, University of

478

PEV-Based Combined Frequency and Voltage Regulation for Smart Grid  

E-Print Network (OSTI)

by either adjusting supply or changing demand. While various demand side management programs have used benefit both users and utilities. Index Terms--Smart grid, plug-in electric vehicles, demand side management, reactive power compensation, ancillary ser- vices, frequency regulation, voltage regulation

Huang, Jianwei

479

Solar cells: A laboratory experiment on the temperature dependence of the open?circuit voltage  

Science Journals Connector (OSTI)

This paper describes a simple demonstration of the effect of an increase in temperature upon the performance of solar cells under concentrated light. It is shown that the expected increase of the open?circuit voltage is offset by the temperature effect. This experiment should be quite relevant as an introduction to the study of concentration for undergraduate physics laboratories.

A. Khoury; J?P. Charles; J. Charette; M. Fieux; P. Mialhe

1984-01-01T23:59:59.000Z

480

Electrical voltages and resistances measured to inspect metallic cased wells and pipelines  

DOE Patents (OSTI)

A cased well in the earth is electrically energized with A.C. current. Voltages are measured from three voltage measurement electrodes in electrical contact with the interior of the casing while the casing is electrically energized. In a measurement mode, A.C. current is conducted from a first current carrying electrode within the cased well to a remote second current carrying electrode located on the surface of the earth. In a calibration mode, current is passed from the first current carrying electrode to a third current carrying electrode located vertically at a different position within the cased well, where the three voltage measurement electrodes are located vertically in between the first and third current carrying electrodes. Voltages along the casing and resistances along the casing are measured to determine wall thickness and the location of any casing collars present so as to electrically inspect the casing. Similar methods are employed to energize a pipeline to measure the wall thickness of the pipeline and the location of pipe joints to electrically inspect the pipeline.

Vail, III, William Banning (Bothell, WA); Momii, Steven Thomas (Seattle, WA)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "voltage region type" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Dual-decay converter for switched reluctance motor drives in low-voltage applications  

SciTech Connect

A modified converter topology for star-connected switched reluctance motors suitable for low-voltage applications is proposed in this paper. A dual time constant freewheeling circuit has been designed to improve the drive performance and efficiency over a wide range of speeds. The different modes of operation of the converter are discussed, and a comparison is made with other converter configurations.

Ehsani, Mehrdad; Husain, Iqbal; Ramani, K.R. (Texas A and M Univ., College Station, TX (United States). Dept. of Electrical Engineering); Galloway, J.H. (J.H. Galloway and Associates, Brookfield, CT (United States))

1993-04-01T23:59:59.000Z

482

Solid-state fault current limiter for voltage sag mitigation and its parameters design  

Science Journals Connector (OSTI)

Due to the difficulty in electric distribution network reinforcement and the interconnection of more distributed generations, fault current level has become a serious problem in system operations. The utilization of solid-state fault current limiters ... Keywords: power quality, simulation, solid-state fault current limiter, voltage sag

B. Boribun; T. Kulworawanichpong

2010-07-01T23:59:59.000Z

483

Strongly nonlinear dynamics of electrolytes in large ac voltages Laurits Hjgaard Olesen,1,2  

E-Print Network (OSTI)

the results have been developed for over a century 1 . Current applications include energy storage; published 2 July 2010 We study the response of a model microelectrochemical cell to a large ac voltage of frequency comparable to the inverse cell relaxation time. To bring out the basic physics, we consider

484

Relationship Between Anode Spots and Onset Voltage Hash in Magnetoplasmadynamic Thrusters  

E-Print Network (OSTI)

Relationship Between Anode Spots and Onset Voltage Hash in Magnetoplasmadynamic Thrusters Luke in magnetoplasmadynamic thrusters operating above onset and the time-resolved appearance of destructively released anode material in the thruster plume. Such a relationship gives support to previously discussed anode spotting

Choueiri, Edgar

485

Distributed voltage control strategy for LV networks with inverter-interfaced generators  

Science Journals Connector (OSTI)

Abstract Low voltage distribution networks are characterized by an ever growing diffusion of single and three phase distributed generators whose unregulated operation may deplete the power quality levels, in particular as regard voltage profiles and unbalances. This issue is at present under discussion by several national and international standardization bodies and the general trend is to require, for the new connections of generators to medium and low voltage grids, their participation to the reactive power network management. In this paper a novel strategy proposes to control the network voltage unbalance suitably for coordinating single and three-phase inverter interfaced embedded generators, concurrently with a local volt/var regulation action as foreseen by the new grid connection requirements. Simulations conducted on case study network representing a typical Italian 4-wire LV distribution system under different load/generation conditions, demonstrate that the coordinated action of single-phase and three-phase inverters may considerably reduce the degree of unbalance thus improving the network power quality levels.

R. Caldon; M. Coppo; R. Turri

2014-01-01T23:59:59.000Z

486

Voltage-gated Ion Channels and Gating Modifier Toxins William A. Catterall,* Sandrine Cestle,  

E-Print Network (OSTI)

;2 Abstract Voltage-gated sodium, calcium, and potassium channels generate electrical signals required and a pore loop. Their pores are formed by the S5/S6 segments and the pore loop between them and are gated and participate in calcium signaling pathways in nonexcitable cells. Because of their importance in many aspects

Paris-Sud XI, Université de

487

Impact of VSC faults on dynamic performance and low voltage ride through of DFIG  

Science Journals Connector (OSTI)

Abstract A doubly-fed induction generator’s (DFIG’s) sensitivity to external faults has motivated researchers to investigate the impact of various grid disturbances, such as voltage sags and short circuit faults, on its low-voltage ride-through (LVRT) capability. However, no attention has been paid to the impact of internal faults in voltage source converters (VSCs), that interface a DFIG with the grid, on the dynamic performance of the machine. This paper investigates the impacts of various VSC faults, on the dynamic performance and LVRT capability of a DFIG. Faults such as open and short circuit within VSC switches and across the DC-link capacitor are considered in this paper. The impact of internal VSC faults when they occur within the grid side converter (GSC) and rotor side converter (RSC) is investigated. Compliance of the voltage profiles of a DFIG with the \\{LVRTs\\} specified in the recent grid codes of the USA, Spain, Mexico, Denmark, Ireland, Germany, Quebec and the UK are examined for the faults studied. The simulation results show that these faults should be considered in designs of protection systems aimed at avoiding any catastrophic failure of the converter switches or wind turbine.

A.F. Abdou; A. Abu-Siada; H.R. Pota

2015-01-01T23:59:59.000Z

488

Rotor current transient analysis of DFIG-based wind turbines during symmetrical voltage faults  

Science Journals Connector (OSTI)

Abstract The impact of grid voltage fault on doubly fed induction generators (DFIGs), especially rotor currents, has received much attention. So, in this paper, the rotor currents of based-DFIG wind turbines are considered in a generalized way, which can be widely used to analyze the cases under different levels of voltage symmetrical faults. A direct method based on space vector is proposed to obtain an accurate expression of rotor currents as a function of time for symmetrical voltage faults in the power system. The presented theoretical analysis is simple and easy to understand and especially highlights the accuracy of the expression. Finally, the comparable simulations evaluate this analysis and show that the expression of the rotor currents is sufficient to calculate the maximum fault current, DC and AC components, and especially helps to understand the causes of the problem and as a result, contributes to adapt reasonable approaches to enhance the fault ride through (FRT) capability of DFIG wind turbines during a voltage fault.

Yu Ling; Xu Cai; Ningbo Wang

2013-01-01T23:59:59.000Z

489

Voltage Stability and Power Quality Issues of Wind Farm with Series Compensation  

E-Print Network (OSTI)

generator (DFIG) wind farms with series and shunt compensation are analyzed. The voltage source converter of a static synchronous compensator (STATCOM), the converter side of a DFIG and a load are considered-speed wind turbine (FSWT) and doubly-fed induction generator (DFIG) based wind farms. The expected number

Pota, Himanshu Roy

490

Current-voltage model of LED light sources Szymon Bczkowski, Stig Munk-Nielsen  

E-Print Network (OSTI)

Current-voltage model of LED light sources Szymon Bczkowski, Stig Munk-Nielsen Department of Energy shifts caused by varying magnitude of LED driving current and nonlinear relationship between intensity radiation into visible light, are gradually being replaced by light-emitting diodes. The invention of LEDs

Munk-Nielsen, Stig

491

Method for reducing fuel cell output voltage to permit low power operation  

DOE Patents (OSTI)

Fuel cell performance is degraded by recycling a portion of the cathode exhaust through the cells and, if necessary, also reducing the total air flow to the cells for the purpose of permitting operation below a power level which would otherwise result in excessive voltage.

Reiser, Carl A. (Glastonbury, CT); Landau, Michael B. (West Hartford, CT)

1980-01-01T23:59:59.000Z

492

Modeling and Analysis of Leakage Induced Damping Effect in Low Voltage LSIs  

E-Print Network (OSTI)

Modeling and Analysis of Leakage Induced Damping Effect in Low Voltage LSIs Jie Gu, John Keane that of a nuclear reactor [1]. Power supply noise which includes IR and Ldi/dt components has become a major design into analog devices, and reliability issues due to hot carrier injection. One challenging task in designing

Kim, Chris H.

493

Amorphous silicon/polyaniline heterojunction solar cells: Fermi levels and open-circuit voltages  

E-Print Network (OSTI)

these open-circuit voltages are lower than for the best a-Si:H cells utilizing nanocrystalline Si or a reports on conducting polymer/ amorphous silicon (a-Si:H) structures [1­4] and conduct- ing polymer/crystalline silicon (c-Si) structures [5,6]. In this paper, we report our research on polyaniline (PANI)/a-Si:H

Schiff, Eric A.

494

Ca2 -dependent activation of Cl currents in Xenopus oocytes is modulated by voltage  

E-Print Network (OSTI)

Ca2 -dependent activation of Cl currents in Xenopus oocytes is modulated by voltage NICK CALLAMARAS, University of California Irvine, Irvine, California 92697-4550 Callamaras, Nick, and Ian Parker. Ca2 278: C667­C675, 2000.-- Ca2 -activated Cl currents (ICl,Ca) were examined using fluorescence confocal

Parker, Ian

495

Structure and hydration of membranes embedded with voltage-sensing domains  

E-Print Network (OSTI)

-sensing domains incorporated into lipid mem- branes for use with neutron diffraction30­33 . The neutron scattering bilayer are critical for the function of voltage-activated ion channels. Here we use neutron diffraction length gives the relative amplitude of the de Broglie wave scattered from a nucleus and is analogous to the

White, Stephen

496

Mitigating Voltage Fade in Cathode Materials by Improving the Atomic Level Uniformity of Elemental Distribution  

SciTech Connect

Li-rich and Mn-rich (LMR) layered structured materials are very promising cathodes for high-energy lithium-ion batteries. However, their fundamental structure and voltage fading mechanisms are far from being well understood. Here we report the first evidence on the reduced voltage and energy fade of LMR cathode by improving the atomic level spatial distribution of the chemical species. LMR cathode (Li[Li0.2Ni0.2M0.6]O2) prepared by co-precipitation and sol-gel methods are dominated by R-3m phase and show significant Ni-segregation at the surface of the particles. They exhibit large voltage-fade and fast capacity degradation. In contrast, LMR cathode prepared by hydrothermal assisted method is dominated by C2/m phase and minimal Ni-segregation. It also demonstrates much smaller voltage-fade and excellent capacity retention. The fundamental correlation between the atomic level spatial distribution of the chemical species and the functional stability of the materials found in this work also guide the design of other functional materials with enhanced stabilities.

Zheng, Jianming; Gu, Meng; Genc, Arda; Xiao, Jie; Xu, Pinghong; Chen, Xilin; Zhu, Zihua; Zhao, Wenbo; Pullan, Lee; Wang, Chong M.; Zhang, Jiguang

2014-04-07T23:59:59.000Z

497

Title of Thesis: RTOS-BASED DYNAMIC VOLTAGE SCALING Degree candidate: Nuengwong Tuaycharoen  

E-Print Network (OSTI)

of Electrical and Computer Engineering Energy consumption of real-time embedded systems becomes more important. The experimental results show that the technique can reduce significantly energy consumption by consuming only 5 of the total energy. Dynamic voltage scaling (DVS) is accepted as the key technique to reduce energy

Jacob, Bruce

498

Intracavity Sensing via Compliance Voltage in an External Cavity Quantum Cascade Laser  

SciTech Connect

We demonstrate a technique for gas phase spectroscopy and sensing by detecting changes in compliance voltage of an external cavity quantum cascade laser due to intracavity absorption. The technique is characterized and used to measure the absorption spectrum of water vapor and Freon-134a.

Phillips, Mark C.; Taubman, Matthew S.

2012-07-01T23:59:59.000Z

499

Revisiting the Closed Loop Response of PWM Converters Controlled by Voltage Feedback  

E-Print Network (OSTI)

mentioned in earlier publications [1-3] and handled by trial and error procedure. No rigorous treatment technology. The reason for this popularity is primarily the difficulty of implementing a fast digitally applies lag-lead network (PID structure compensator) to regulate the output voltage and set the desired

500

Electrical voltages and resistances measured to inspect metallic cased wells and pipelines  

DOE Patents (OSTI)

A cased well in the earth is electrically energized with A.C. current. Voltages are measured from three voltage measurement electrodes in electrical contact with the interior of the casing while the casing is electrically energized. In a measurement mode, A.C. current is conducted from a first current carrying electrode within the cased well to a remote second current carrying electrode located on the surface of the earth. In a calibration mode, current is passed from the first current carrying electrode to a third current carrying electrode located vertically at a different position within the cased well, where the three voltage measurement electrodes are located vertically in between the first and third current carrying electrodes. Voltages along the casing and resistances along the casing are measured to determine wall thickness and the location of any casing collars present so as to electrically inspect the casing. Similar methods are employed to energize a pipeline to measure the wall thickness of the pipeline and the location of pipe joints to electrically inspect the pipeline.

Vail, III, William Banning (Bothell, WA); Momii, Steven Thomas (Seattle, WA)

2001-01-01T23:59:59.000Z