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Note: This page contains sample records for the topic "ground fault circuit" from the National Library of EnergyBeta (NLEBeta).
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1

Apparatus for and method of testing an electrical ground fault circuit interrupt device  

DOE Patents (OSTI)

An apparatus for testing a ground fault circuit interrupt device includes a processor, an input device connected to the processor for receiving input from an operator, a storage media connected to the processor for storing test data, an output device connected to the processor for outputting information corresponding to the test data to the operator, and a calibrated variable load circuit connected between the processor and the ground fault circuit interrupt device. The ground fault circuit interrupt device is configured to trip a corresponding circuit breaker. The processor is configured to receive signals from the calibrated variable load circuit and to process the signals to determine a trip threshold current and/or a trip time. A method of testing the ground fault circuit interrupt device includes a first step of providing an identification for the ground fault circuit interrupt device. Test data is then recorded in accordance with the identification. By comparing test data from an initial test with test data from a subsequent test, a trend of performance for the ground fault circuit interrupt device is determined.

Andrews, Lowell B. (2181-13th Ave. SW., Largo, FL 34640)

1998-01-01T23:59:59.000Z

2

Apparatus for and method of testing an electrical ground fault circuit interrupt device  

DOE Patents (OSTI)

An apparatus for testing a ground fault circuit interrupt device includes a processor, an input device connected to the processor for receiving input from an operator, a storage media connected to the processor for storing test data, an output device connected to the processor for outputting information corresponding to the test data to the operator, and a calibrated variable load circuit connected between the processor and the ground fault circuit interrupt device. The ground fault circuit interrupt device is configured to trip a corresponding circuit breaker. The processor is configured to receive signals from the calibrated variable load circuit and to process the signals to determine a trip threshold current and/or a trip time. A method of testing the ground fault circuit interrupt device includes a first step of providing an identification for the ground fault circuit interrupt device. Test data is then recorded in accordance with the identification. By comparing test data from an initial test with test data from a subsequent test, a trend of performance for the ground fault circuit interrupt device is determined. 17 figs.

Andrews, L.B.

1998-08-18T23:59:59.000Z

3

DIFFERENTIAL FAULT SENSING CIRCUIT  

DOE Patents (OSTI)

A differential fault sensing circuit is designed for detecting arcing in high-voltage vacuum tubes arranged in parallel. A circuit is provided which senses differences in voltages appearing between corresponding elements likely to fault. Sensitivity of the circuit is adjusted to some level above which arcing will cause detectable differences in voltage. For particular corresponding elements, a group of pulse transformers are connected in parallel with diodes connected across the secondaries thereof so that only voltage excursions are transmitted to a thyratron which is biased to the sensitivity level mentioned.

Roberts, J.H.

1961-09-01T23:59:59.000Z

4

CONTROL AND FAULT DETECTOR CIRCUIT  

DOE Patents (OSTI)

A power control and fault detectcr circuit for a radiofrequency system is described. The operation of the circuit controls the power output of a radio- frequency power supply to automatically start the flow of energizing power to the radio-frequency power supply and to gradually increase the power to a predetermined level which is below the point where destruction occurs upon the happening of a fault. If the radio-frequency power supply output fails to increase during such period, the control does not further increase the power. On the other hand, if the output of the radio-frequency power supply properly increases, then the control continues to increase the power to a maximum value. After the maximumn value of radio-frequency output has been achieved. the control is responsive to a ''fault,'' such as a short circuit in the radio-frequency system being driven, so that the flow of power is interrupted for an interval before the cycle is repeated.

Winningstad, C.N.

1958-04-01T23:59:59.000Z

5

Original article: An efficient, simplified multiple-coupled circuit model of the induction motor aimed to simulate different types of stator faults  

Science Conference Proceedings (OSTI)

This paper proposes an original simplified model aimed to simulate, an easy way, inter turns short circuit fault, phase to phase fault and phase to ground fault. In this model, the stator is considered as six magnetically coupled windings and the rotor ... Keywords: Fault diagnosis, Inter turns short circuit fault, Phase to ground fault, Phase to phase fault, Symmetrical components

M. Bouzid, G. Champenois

2013-04-01T23:59:59.000Z

6

Automatic fault extraction and simulation of layout realistic faults for integrated analogue circuits  

Science Conference Proceedings (OSTI)

A comprehensive tool has been implemented for the comparison of different test preparation techniques and target faults. It comprises of the realistic fault characterisation program LIFT that can extract sets of various faults from a given analogue or ... Keywords: AnaFAUL, LIFT, VCO, analogue integrated circuits, automatic analogue fault simulation program, catastrophic faults, circuit analysis computing, circuit layout, fault diagnosis, integrated analogue circuits, integrated circuit layout, integrated circuit testing, mixed analogue-digital integrated circuits, mixed-signal circuit, parametric faults, realistic fault characterisation program, simulation, test preparation, voltage-controlled oscillators

C. Sebeke; J. P. Teixeira; M. J. Ohletz

1995-03-01T23:59:59.000Z

7

Fault diagnosis in reversible circuits under missing-gate fault model  

Science Conference Proceedings (OSTI)

This article presents a novel technique for fault detection as well as fault location in a reversible combinational circuit under the missing gate fault model. It is shown that in an (nxn) reversible circuit implemented with k-CNOT gates, addition of ...

Hafizur Rahaman; Dipak K. Kole; Debesh K. Das; Bhargab B. Bhattacharya

2011-07-01T23:59:59.000Z

8

A SVDD approach of fuzzy classification for analog circuit fault diagnosis with FWT as preprocessor  

Science Conference Proceedings (OSTI)

In this paper, a new approach of fault diagnosis in analog circuits, which employs the Fractional Wavelet Transform (FWT) to extract fault features and adopts a fuzzy multi-classifier based on the Support Vector Data Description (SVDD) to diagnose circuit ... Keywords: Analog circuit, Fault diagnosis, Feature extraction, Fractional wavelet transform, KFCM, SVDD

Hui Luo; Youren Wang, Jiang Cui

2011-08-01T23:59:59.000Z

9

Practical method for evaluating ground fault current distribution in station supplied by an unhomogeneous line  

SciTech Connect

The paper presents an analytical procedure which enables a quick and, at the design stage, correct evaluation of the ground fault current distribution, for a fault in a substation supplied by a line composed of two or more uniform and different sections. The advantages of the method are based on the simplicity and accuracy of the formulae for solving uniform lumped parameter ladder circuits of any size and under any terminal conditions. The formulae are obtained by applying the general equations of the line represented by discrete parameters on a specific electrical circuit formed by a transmission line ground wire during ground faults. The paper also derives simple and exact expressions for solving ladder circuits formed by the discretization of underground conductors which are in continuous contact with earth (e.g., the sheaths of a cable, an interconnecting copper buried in the soil, a pipeline, etc.). The correct prediction of the expected ground fault current parts in soil and neutral conductors is of great importance in designing safe and economical substation grounding installations.

Popovic, L.M. [JP Elektroprivreda Srbije, Belgrade (Yugoslavia)] [JP Elektroprivreda Srbije, Belgrade (Yugoslavia)

1997-04-01T23:59:59.000Z

10

Design and test rules for CMOS circuits to facilitate IDDQ testing of bridging faults  

Science Conference Proceedings (OSTI)

All possible bridging faults (BFs) between any two circuit nodes are considered, where a circuit node may be the drain, source, or gate terminal of a transistor. Several examples are given to show that under certain circumstances current supply monitoring ...

K. -J. Lee; M. A. Breuer

2006-11-01T23:59:59.000Z

11

Fault current limiter and alternating current circuit breaker  

DOE Patents (OSTI)

A solid-state circuit breaker and current limiter are disclosed for a load served by an alternating current source having a source impedance, the solid-state circuit breaker and current limiter comprising a thyristor bridge interposed between the alternating current source and the load, the thyristor bridge having four thyristor legs and four nodes, with a first node connected to the alternating current source, and a second node connected to the load. A coil is connected from a third node to a fourth node, the coil having an impedance of a value calculated to limit the current flowing therethrough to a predetermined value. Control means are connected to the thyristor legs for limiting the alternating current flow to the load under fault conditions to a predetermined level, and for gating the thyristor bridge under fault conditions to quickly reduce alternating current flowing therethrough to zero and thereafter to maintain the thyristor bridge in an electrically open condition preventing the alternating current from flowing therethrough for a predetermined period of time. 9 figs.

Boenig, H.J.

1998-03-10T23:59:59.000Z

12

Fault current limiter and alternating current circuit breaker  

Science Conference Proceedings (OSTI)

A solid-state circuit breaker and current limiter for a load served by an alternating current source having a source impedance, the solid-state circuit breaker and current limiter comprising a thyristor bridge interposed between the alternating current source and the load, the thyristor bridge having four thyristor legs and four nodes, with a first node connected to the alternating current source, and a second node connected to the load. A coil is connected from a third node to a fourth node, the coil having an impedance of a value calculated to limit the current flowing therethrough to a predetermined value. Control means are connected to the thyristor legs for limiting the alternating current flow to the load under fault conditions to a predetermined level, and for gating the thyristor bridge under fault conditions to quickly reduce alternating current flowing therethrough to zero and thereafter to maintain the thyristor bridge in an electrically open condition preventing the alternating current from flowing therethrough for a predetermined period of time.

Boenig, Heinrich J. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

13

Protection from ground faults in the stator winding of generators at power plants in the Siberian networks  

SciTech Connect

The experience of many years of experience in developing and utilization of ground fault protection in the stator winding of generators in the Siberian networks is generalized. The main method of protection is to apply a direct current or an alternating current with a frequency of 25 Hz to the primary circuits of the stator. A direct current is applied to turbo generators operating in a unit with a transformer without a resistive coupling to the external grid or to other generators. Applying a 25 Hz control current is appropriate for power generation systems with compensation of a capacitive short circuit current to ground. This method forms the basis for protection of generators operating on busbars, hydroelectric generators with a neutral grounded through an arc-suppression reactor, including in consolidated units with generators operating in parallel on a single low-voltage transformer winding.

Vainshtein, R. A., E-mail: vra@tpu.ru [Tomsk Polytechnical University (Russian Federation); Lapin, V. I. [ODU Sibiri (Integrated Dispatcher Control for Siberia), branch of JSC 'SO EES' (Russian Federation); Naumov, A. M.; Doronin, A. V. [JSC NPP 'EKRA' (Russian Federation); Yudin, S. M. [Tomsk Polytechnical University (Russian Federation)

2010-05-15T23:59:59.000Z

14

Investigation of Ground-Fault Protection Devices for Photovoltaic Power Systems Applications  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) power systems, like other electrical systems, may be subject to unexpected ground faults. Installed PV systems always have invisible elements other than those indicated by their electrical schematics. Stray inductance, capacitance and resistance are distributed throughout the system. Leakage currents associated with the PV modules, the interconnected array, wires, surge protection devices and conduit add up and can become large enough to look like a ground-fault. PV systems are frequently connected to other sources of power or energy storage such as batteries, standby generators, and the utility grid. This complex arrangement of distributed power and energy sources, distributed impedance and proximity to other sources of power requires sensing of ground faults and proper reaction by the ground-fault protection devices. The different dc grounding requirements (country to country) often add more confusion to the situation. This paper discusses the ground-fault issues associated with both the dc and ac side of PV systems and presents test results and operational impacts of backfeeding commercially available ac ground-fault protection devices under various modes of operation. Further, the measured effects of backfeeding the tripped ground-fault devices for periods of time comparable to anti-islanding allowances for utility interconnection of PV inverters in the United States are reported.

BOWER,WARD I.; WILES,JOHN

2000-10-03T23:59:59.000Z

15

Numeric simulation of faults in electrical networks  

Science Conference Proceedings (OSTI)

In the paper is presented a virtual simulator for three-phased medium voltage electric circuits. The simulator allows analyzing transient regimes caused by the faults produced in electric distribution networks (simple grounding, double grounding, broken ... Keywords: faults in electric network, numerical simulation, three phased circuits, transient regimes

Toader Dumitru; Haragus Stefan; Blaj Constantin

2009-03-01T23:59:59.000Z

16

System for detecting and limiting electrical ground faults within electrical devices  

DOE Patents (OSTI)

An electrical ground fault detection and limitation system for employment with a nuclear reactor utilizing a liquid metal coolant. Elongate electromagnetic pumps submerged within the liquid metal coolant and electrical support equipment experiencing an insulation breakdown occasion the development of electrical ground fault current. Without some form of detection and control, these currents may build to damaging power levels to expose the pump drive components to liquid metal coolant such as sodium with resultant undesirable secondary effects. Such electrical ground fault currents are detected and controlled through the employment of an isolated power input to the pumps and with the use of a ground fault control conductor providing a direct return path from the affected components to the power source. By incorporating a resistance arrangement with the ground fault control conductor, the amount of fault current permitted to flow may be regulated to the extent that the reactor may remain in operation until maintenance may be performed, notwithstanding the existence of the fault. Monitors such as synchronous demodulators may be employed to identify and evaluate fault currents for each phase of a polyphase power, and control input to the submerged pump and associated support equipment.

Gaubatz, Donald C. (Cupertino, CA)

1990-01-01T23:59:59.000Z

17

Creating dynamic equivalent PV circuit models with impedance spectroscopy for arc-fault modeling.  

Science Conference Proceedings (OSTI)

Article 690.11 in the 2011 National Electrical Code{reg_sign} (NEC{reg_sign}) requires new photovoltaic (PV) systems on or penetrating a building to include a listed arc fault protection device. Currently there is little experimental or empirical research into the behavior of the arcing frequencies through PV components despite the potential for modules and other PV components to filter or attenuate arcing signatures that could render the arc detector ineffective. To model AC arcing signal propagation along PV strings, the well-studied DC diode models were found to inadequately capture the behavior of high frequency arcing signals. Instead dynamic equivalent circuit models of PV modules were required to describe the impedance for alternating currents in modules. The nonlinearities present in PV cells resulting from irradiance, temperature, frequency, and bias voltage variations make modeling these systems challenging. Linearized dynamic equivalent circuits were created for multiple PV module manufacturers and module technologies. The equivalent resistances and capacitances for the modules were determined using impedance spectroscopy with no bias voltage and no irradiance. The equivalent circuit model was employed to evaluate modules having irradiance conditions that could not be measured directly with the instrumentation. Although there was a wide range of circuit component values, the complex impedance model does not predict filtering of arc fault frequencies in PV strings for any irradiance level. Experimental results with no irradiance agree with the model and show nearly no attenuation for 1 Hz to 100 kHz input frequencies.

Johnson, Jay Dean; Kuszmaul, Scott S.; Strauch, Jason E.; Schoenwald, David Alan

2011-06-01T23:59:59.000Z

18

Research on Fault Diagnosis on High Voltage SF6 Circuit Breaker Based on the Db Wavelet and Fuzzy Theory  

Science Conference Proceedings (OSTI)

This dissertation aims at providing a quick and accurate fault diagnosis method for on high voltage SF6circuit breaker. This method indirectly monitors the functioning of the breaker by observing the electric current in the coil of its switch. The electrical ... Keywords: SF6 circuit breaker, monitor, wavelet transform, fuzzy theory

Li Yang; Zhuo Yang; Yang Lei; Kejie Dai; Weiming Guan

2012-05-01T23:59:59.000Z

19

Tests show ability of vacuum circuit breaker to interrupt fast transient recovery voltage rates of rise of transformer secondary faults  

Science Conference Proceedings (OSTI)

A vacuum circuit breaker demonstrated its ability to interrupt short circuits with faster than normal rates of rise of transient recovery voltage (TRV) at levels greater than those produced by most transformer secondary faults. Two recent exploratory test programs evaluated the interrupting ability of a 15kV vacuum circuit breaker containing interrupters of the rotating arc type with contacts made from a chromium-copper powder metal mixture. The interrupting conditions covered a wide range of currents from 10% to 130% of the 28kA rated short circuit current of the tested circuit breaker and a wide range of TRV rates of rise, including the relatively slow rate of rise, normally used in testing and found in most indoor circuit breaker applications, two faster rates of rise equaling and exceeding those found in a known power plant transformer secondary protection application, and the fastest rates of rise possible in the laboratory which exceed the requirements of most transformer secondary faults. These tests showed that the interrupting performance of the tested vacuum circuit breaker was unaffected by the TRV rate of rise to the fastest rates available in the test lab. Such a vacuum circuit breaker can therefore be used without TRV modifying capacitors to slow down the rate of rise provided by the power system. This ability is particularly important if analysis shows that the expected TRV from a transformer secondary fault has a fast rate of rise beyond the recognized ability of an older circuit breaker to acceptably interrupt.

Smith, R.K. [Westinghouse Science and Technology Center, Pittsburgh, PA (United States)

1995-01-01T23:59:59.000Z

20

A 4000-A HVDC (high-voltage direct-current) circuit breaker with fast fault-clearing capability: Final report  

Science Conference Proceedings (OSTI)

This project is a follow-up of the first development of a 500 kV HVDC airblast circuit breaker (EPRI project 1507-3). The objective was to increase the current interrupting capability from 2200 A to 4000 A and shorten its fault clearing time. A high current 500 kV HVDC circuit breaker has been built using the passive commutation circuit. The breaker is modular in construction and can be designed for a wide variety of system conditions. More than 400 current interruptions were carried out successfully. Tests have shown that this circuit breaker is capable of interrupting more than 4000 A dc. Practical breakers with current interrupting capability of even 5500 A dc could be built. The circuit breaker operation and the fault-clearing process can be materially speeded up if the trip signal is given as soon as the fault is detected and without waiting for the current levels to come down in response to converter control action. The new dc breakers are shown to be capable of withstanding these transient arc currents of 8000 A without affecting its ability to interrupt the direct current that follows the transient. This transient current withstand capability is greater than is likely to occur during dc faults. The fault clearing time of this HVDC circuit breaker is comparable to the fault clearing time of conventional ac breakers for ac faults. The developed HVDC circuit breaker is now commercially available and can be supplied for use in HVDC systems. Its use in such systems is expected to provide flexibility in system design and contribute to system stability. 38 refs., 52 figs., 9 tabs.

Not Available

1988-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Evaluation of faulting characteristics and ground acceleration associated with recent movement along the Meers Fault, Southwestern Oklahoma  

E-Print Network (OSTI)

Recent studies have shown that a 27 km section of the Meers Fault was reactivated during Holocene time. Although these studies have proven the occurrence of recent fault activity, many basic characteristics of the faulting remain unresolved, For instance, the issue of whether recent deformation was dominantly vertical or laterally oriented is still a source of disagreement among many researchers. The number of events associated with recent movement is another area of uncertainty, with I to 4 events being cited as responsible for the Meers Fault scarp. Earthquakes of magnitude 7 to 8 occurring in conjunction with recent reactivation of the fault have been calculated. However, evidence found within the Wichita Mountains just south of the fault exhibits strong evidence against large recent earthquake events. Investigation of stream channel pathways where they cross the fault revealed that many streams previously identified as left-laterally offset are instead left-laterally deflected by folding on the upthrown block. These streams are in every case deflected much farther than any true lateral displacement recognized on the fault. Inclusion of the streams in past studies has apparently contributed to over-estimation of the recent component of left-lateral displacement. Exposure development into the Meers Fault scarp revealed deformed units and colluvial wedges that indicate 4 recent movements produced a total of 1.46 m of brittle deformation and another 1.04 m of monoclinal warping. A previously unidentified conglomerate uncovered in the exposure exhibits evidence for a lateral component of displacement during possible Late Pleistocene deformation. subsequent events identified in the exposure. Reconnaissance of the Wichita Mountains granitic terrain just south of the Meers Fault resulted in the identification of 27 precariously balanced rocks (tors). These geomorphic features lie within 18 km of the fault and have apparently been sitting in their present positions on the order of thousands of years. Quantitative analysis of the tors indicates that most could not have withstood the ground accelerations generated by magnitude 7 or above earthquakes estimated to have occurred with recent deformation.

Burrell, Richard Dennis

1997-01-01T23:59:59.000Z

22

Near-fault earthquake ground motion prediction by a high-performance spectral element numerical code  

Science Conference Proceedings (OSTI)

Near-fault effects have been widely recognised to produce specific features of earthquake ground motion, that cannot be reliably predicted by 1D seismic wave propagation modelling, used as a standard in engineering applications. These features may have a relevant impact on the structural response, especially in the nonlinear range, that is hard to predict and to be put in a design format, due to the scarcity of significant earthquake records and of reliable numerical simulations. In this contribution a pilot study is presented for the evaluation of seismic ground-motions in the near-fault region, based on a high-performance numerical code for 3D seismic wave propagation analyses, including the seismic fault, the wave propagation path and the near-surface geological or topographical irregularity. For this purpose, the software package GeoELSE is adopted, based on the spectral element method. The set-up of the numerical benchmark of 3D ground motion simulation in the valley of Grenoble (French Alps) is chosen to study the effect of the complex interaction between basin geometry and radiation mechanism on the variability of earthquake ground motion.

Paolucci, Roberto [Department of Structural Engineering, Politecnico di Milano P.za Leonardo da Vinci 32, 20133, Milano (Italy); Stupazzini, Marco [Department of Structural Engineering, Politecnico di Milano P.za Leonardo da Vinci 32, 20133, Milano (Italy); EUCENTRE, v. Ferrata 1, Pavia (Italy)

2008-07-08T23:59:59.000Z

23

The Response of Long-Span Bridges to Low Frequency, Near-Fault Earthquake Ground Motions  

SciTech Connect

Historical seismic hazard characterizations did not include earthquake ground motion waveforms at frequencies below approximately 0.2 Hz (5 seconds period). This resulted from limitations in early strong motion instrumentation and signal processing techniques, a lack of measurements in the near-field of major earthquakes and therefore no observational awareness, and a delayed understanding in the engineering community of the potential significance of these types of motions. In recent years, there is a growing recognition of the relevance of near-fault, low frequency motions, particularly for long-period structures such as large bridges. This paper describes a computationally based study of the effects of low frequency (long-period) near-fault motions on long-span bridge response. The importance of inclusion of these types of motions for long span cable supported bridges is demonstrated using actual measured broad-band, near-fault motions from large earthquakes.

McCallen, David; Astaneh-Asl, A.; Larsen, S.C.; Hutchings, Larry

2009-02-27T23:59:59.000Z

24

Resource Requirements for Fault-Tolerant Quantum Simulation: The Transverse Ising Model Ground State  

E-Print Network (OSTI)

The cost, in both computational space and time, of calculating the energy of the ground state of the transverse Ising model on a fault-tolerant quantum computer is estimated using the Quantum Logic Array (QLA) architecture model. The QLA is a homogeneous, scalable, tile-based quantum architecture design employing concatenated quantum error correction for the construction of logical qubits and gates, based on experimentally viable ion-trap device technology parameters and components. The error correction requirements for calculating the energy on the QLA architecture are comparable to those for factoring large integers via Shor's quantum factoring algorithm number due to the exponential scaling of the computational timesteps with the precision. As a result, a fault-tolerant QLA-based quantum computer which can factor 1024-bit integers can also be used to calculate the Ising ground-state energy with precision of up to 7 decimal digits.

Clark, Craig R; Metodi, Tzvetan S; Gasster, Samuel D

2008-01-01T23:59:59.000Z

25

2012 SG Peer Review - Wide Area Wireless Distribution Grid Sensor & Faulted Circuit Indicator System for Underground Assets - Jason Wilson, On-Ramp Wireless  

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

Wide Area Wireless Distribution Grid Sensor Wide Area Wireless Distribution Grid Sensor for Underground Assets Jason Wilson On-Ramp Wireless June 7, 2012 December 2008 Wide Area Wireless Distribution Grid Sensor for Underground Assets Objective Life-cycle Funding Summary ($K) Prior to FY 12 FY12, authorized FY13, requested Out-year(s) $1,046 $580 $39 $0 Technical Scope Develop and demonstrate a wireless network solution for distribution automation, including fault circuit indicators and transformer monitoring, capable of secure and reliable communication with below ground and hard to reach utility assets at a TCO that is commercially viable for utilities to deploy at large scale. Enable utilities throughout the US to improve critical grid reliability metrics including SAIDI. * Conceptual design and trade studies including sensor system interfaces, augmenting FCI with

26

Short Circuit Analysis of Induction Machines Wind Power Application  

Science Conference Proceedings (OSTI)

he short circuit behavior of Type I (fixed speed) wind turbine-generators is analyzed in this paper to aid in the protection coordination of wind plants of this type. A simple network consisting of one wind turbine-generator is analyzed for two network faults: a three phase short circuit and a phase A to ground fault. Electromagnetic transient simulations and sequence network calculations are compared for the two fault scenarios. It is found that traditional sequence network calculations give accurate results for the short circuit currents in the balanced fault case, but are inaccurate for the un-faulted phases in the unbalanced fault case. The time-current behavior of the fundamental frequency component of the short circuit currents for both fault cases are described, and found to differ significantly in the unbalanced and balanced fault cases

Starke, Michael R [ORNL; Smith, Travis M [ORNL; Howard, Dustin [Georgia Institute of Technology; Harley, Ronald [Georgia Institute of Technology

2012-01-01T23:59:59.000Z

27

DC Arc Fault Detection and Circuit Interruption Technologies for Photovoltaic Systems  

Science Conference Proceedings (OSTI)

In the United States, much like the rest of the world, rapid growth in photovoltaic (PV) systems is currently taking place. These systems are being installed in open fields, on parking structures, and on residential or commercial rooftops. Unfortunately, electrical arcing within a PV system’s DC circuits has caused some fires. DC-sourced electrical fires are difficult to extinguish if arcing originates from unprotected source circuits within a PV array. Several high-visibility structural fires ...

2013-12-20T23:59:59.000Z

28

Personnel Protection Systems for Electric Vehicle Charging Circuits  

Science Conference Proceedings (OSTI)

Electric vehicle charging systems will be required to provide protection against electric shock due to ground faults. This report reviews the subject of electric shock, including the effects of current magnitude, frequency, duration, alternating and direct current, and supply voltage to ground. The report suggests a basis for specific safety requirements--such as a ground fault circuit interrupt--that can be included in a product safety standard covering electric vehicle charging systems to meet the 1996...

2000-01-05T23:59:59.000Z

29

Fault finder  

DOE Patents (OSTI)

A fault finder for locating faults along a high voltage electrical transmission line. Real time monitoring of background noise and improved filtering of input signals is used to identify the occurrence of a fault. A fault is detected at both a master and remote unit spaced along the line. A master clock synchronizes operation of a similar clock at the remote unit. Both units include modulator and demodulator circuits for transmission of clock signals and data. All data is received at the master unit for processing to determine an accurate fault distance calculation.

Bunch, Richard H. (1614 NW. 106th St., Vancouver, WA 98665)

1986-01-01T23:59:59.000Z

30

The effect of fractures, faults, and sheared shale zones on the hydrology of Bear Creek Burial Grounds A-South, Oak Ridge, Tennessee  

E-Print Network (OSTI)

Previous hydrologic models of flow in Bear Creek Valley have presented lateral flow as occurring through the Nolichucky Shale in parallel to strike fractures within thin carbonate beds; the effects of faults were not considered. This study presents a ground water flow model that incorporates lateral flow through parallel-to-strike fractures and thrust faults, and perpendicular-to-strike cross valley strike-slip faults. These latter cross-valley structures cause flow to be diverted to other strikeparallel zones of enhanced permeability towards the south side of the valley. Using core, geophysical and hydrologic data from five boreholes in the Bear Creek Burial Grounds three types of potential fluid-flow conduits were identified: fractures, faults, and shale shear zones. Open fractures decrease in abundance with depth and tend to occur most frequently in oolitic limestone beds relative to other carbonate lithologies. Fractures below 1 00 ft BGS in the Nolichucky Shale and below 250 ft in the Maynardville Limestone do not appear to be caused by dissolution; instead, they appear to be the result of a change in the local stress field due to erosion effects. Faults, both cross-valley and thrust faults, and sheared shale zones are interpreted to disrupt the lateral continuity of the bedding and increase the rock-mass permeability of the Nolichucky Shale, permitting ground water to flow these structural zones. This study provided opportunity to interpret DNAPL migration patterns from Burial Ground A-South. DNAPL migration parallel to the valley's axis is affected by parallel-to-strike fractures and thrust faults, and its lateral migration perpendicular to strike is influenced by cross valley strike-slip faults and decreasing collect at depth because of decreasing fracture occurrence and reduced permeability and then migrate laterally along the cross valley strike-slip faults until it encounters and enters a zone of higher permeability parallel to strike.

Hollon, Dwight Mitchell

1997-01-01T23:59:59.000Z

31

Parallel fault backtracing for calculation of fault coverage  

Science Conference Proceedings (OSTI)

A new improved method for calculation of fault coverage with parallel fault backtracing in combinational circuits is proposed. The method is based on structurally synthesized BDDs (SSBDD) which represent gate-level circuits at higher, macro level where ...

Raimund Ubar; Sergei Devadze; Jaan Raik; Artur Jutman

2008-01-01T23:59:59.000Z

32

Arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

Jha, Kamal N. (Bethel Park, PA)

1999-01-01T23:59:59.000Z

33

Arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard. 1 fig.

Jha, K.N.

1999-05-18T23:59:59.000Z

34

Fault Current Limiters  

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

Fault Fault Current Limiters Superconducting & Solid-state Power Equipment Office of Electricity Delivery and Energy Reliability www.oe.energy.gov Office of Electricity Delivery and Energy Reliability, OE-1 U.S. Department of Energy - 1000 Independence Avenue, SW - Washington, DC 20585 Plugging America Into the Future of Power What are FCLs? A fault is an unintentional short circuit, or partial short-circuit, in an electric circuit. A variety of factors such as lightning, downed power lines, or crossed power lines cause faults. During a fault, excessive current-called fault current- flows through the electrical system often resulting in a failure of one section of that system by causing a

35

GATING CIRCUITS  

DOE Patents (OSTI)

Control circuits for vacuum tubes are described, and a binary counter having an improved trigger circuit is reported. The salient feature of the binary counter is the application of the input signal to the cathode of each of two vacuum tubes through separate capacitors and the connection of each cathode to ground through separate diodes. The control of the binary counter is achieved in this manner without special pulse shaping of the input signal. A further advantage of the circuit is the simplicity and minimum nuruber of components required, making its use particularly desirable in computer machines.

Merrill, L.C.

1958-10-14T23:59:59.000Z

36

An arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn, opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

Jha, Kamal N.

1997-12-01T23:59:59.000Z

37

Definition: Fault Current Limiter | Open Energy Information  

Open Energy Info (EERE)

Limiter Limiter Jump to: navigation, search Dictionary.png Fault Current Limiter A fault current limiter prevents current in an electrical circuit from exceeding a predetermined level by increasing the electrical impedance of that circuit before the current through the circuit exceeds that level. Fault current limiters are designed so as to minimize the impedance of the circuit under normal conditions to reduce losses, but increase the impedance of the circuit under fault conditions to limit fault current.[1] View on Wikipedia Wikipedia Definition A Fault Current Limiter (FCL) is a device which limits the prospective fault current when a fault occurs (e.g. in a power transmission network). The term includes superconducting devices and non-superconducting devices, however some of the more simple non-superconducting devices (such

38

High temperature superconducting fault current limiter  

DOE Patents (OSTI)

A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.

Hull, J.R.

1997-02-04T23:59:59.000Z

39

Piezoelectric drive circuit  

DOE Patents (OSTI)

A piezoelectric motor drive circuit is provided which utilizes the piezoelectric elements as oscillators and a Meacham half-bridge approach to develop feedback from the motor ground circuit to produce a signal to drive amplifiers to power the motor. The circuit automatically compensates for shifts in harmonic frequency of the piezoelectric elements due to pressure and temperature changes.

Treu, Jr., Charles A. (Raymore, MO)

1999-08-31T23:59:59.000Z

40

Piezoelectric drive circuit  

DOE Patents (OSTI)

A piezoelectric motor drive circuit is provided which utilizes the piezoelectric elements as oscillators and a Meacham half-bridge approach to develop feedback from the motor ground circuit to produce a signal to drive amplifiers to power the motor. The circuit automatically compensates for shifts in harmonic frequency of the piezoelectric elements due to pressure and temperature changes. 7 figs.

Treu, C.A. Jr.

1999-08-31T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Transient fault modeling and fault injection simulation  

E-Print Network (OSTI)

An accurate transient fault model is presented in this thesis. A 7-term exponential current upset model is derived from the results of a device-level, 3-dimensional, single-event-upset simulation. A curve-fitting algorithm is used to extract the numerical model from the empirical data. The model is implemented in a HSPICE simulation environment as a current-injection source for fault simulation. The current transient model is used to conduct electrical-level fault injection simulations on a static RAM cell and subcircuits from two commercial microprocessors. The results from the 7-term exponential model are compared with the results from the widely accepted double-exponential transient model. The experimental data indicate that, for a given charge level, the 7-term exponential fault model results in a higher chance of having a latch error. More importantly, different latch-error patterns are captured from the target circuits under the new fault model.

Yuan, Xuejun

1996-01-01T23:59:59.000Z

42

A Fault-Tolerant Scheme of Holonomic Quantum Computation on Stabilizer Codes with Robustness to Thermal Noise  

E-Print Network (OSTI)

We show an equivalence relation between fault-tolerant circuits for a stabilizer code and fault-tolerant adiabatic processes for holonomic quantum computation (HQC), in the case where quantum information is encoded in the ground state of the system Hamiltonian. By this equivalence, we can systematically construct a fault-tolerant HQC scheme, which can geometrically implement a universal set of encoded quantum gates by adiabatically deforming the system Hamiltonian. During this process, quantum information is protected from thermal excitation by an energy gap that does not change with the problem size.

Yi-Cong Zheng; Todd A. Brun

2013-09-06T23:59:59.000Z

43

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 ...

44

Optimal fault location  

E-Print Network (OSTI)

Basic goal of power system is to continuously provide electrical energy to the users. Like with any other system, failures in power system can occur. In those situations it is critical that correct remedial actions are applied as soon as possible after the accurate fault condition and location are detected. This thesis has been focusing on automated fault location procedure. Different fault location algorithms, classified according to the spatial placement of physical measurements on single ended, multiple ended and sparse system-wide, are investigated. As outcome of this review, methods are listed as function of different parameters that influence their accuracy. This comparison is than used for generating procedure for optimal fault location algorithm selection. According to available data, and position of the fault with respect to the data, proposed procedure decides between different algorithms and selects an optimal one. A new approach is developed by utilizing different data structures such as binary tree and serialization in order to efficiently implement algorithm decision engine. After accuracy of algorithms is strongly influenced by available input data, different data sources are recommended in proposed architecture such as the digital fault recorders, circuit breaker monitoring, SCADA, power system model and etc. Algorithm for determining faulted section is proposed based on the data from circuit breaker monitoring devices. This algorithm works in real time by recognizing to which sequence of events newly obtained recording belongs. Software prototype of the proposed automated fault location analysis is developed using Java programming language. Fault location analysis is automatically triggered by appearance of new event files in a specific folder. The tests were carried out using the real life transmission system as an example.

Knezev, Maja

2007-12-01T23:59:59.000Z

45

Distribution Fault Location and Waveform Characterization  

Science Conference Proceedings (OSTI)

Automated fault location algorithms for distribution systems require monitoring equipment to record voltage and current waveforms during an event. In addition, most of these algorithms require circuit-impedance parameters to evaluate the fault location. Locating incipient faults and fault waveform characterization is the main aim of this project. This project builds on work done in 2008 towards sub-cycle blip identification using an algorithm based on arc voltage.

2009-12-11T23:59:59.000Z

46

A transmission line fault locator based on Elman recurrent networks  

Science Conference Proceedings (OSTI)

In this paper, a transmission line fault location model which is based on an Elman recurrent network (ERN) has been presented for balanced and unbalanced short circuit faults. All fault situations with different inception times are implemented on a 380-kV ... Keywords: Elman networks, Fault location, Transmission lines, Wavelet transform

Sami Ekici; Selcuk Yildirim; Mustafa Poyraz

2009-01-01T23:59:59.000Z

47

Measuring circuit  

DOE Patents (OSTI)

An automatic gain control circuit functions to adjust the magnitude of an input signal supplied to a measuring circuit to a level within the dynamic range of the measuring circuit while a log-ratio circuit adjusts the magnitude of the output signal from the measuring circuit to the level of the input signal and optimizes the signal-to-noise ratio performance of the measuring circuit.

Sun, Shan C. (Pittsburgh, PA); Chaprnka, Anthony G. (Cockeysville, MD)

1977-01-11T23:59:59.000Z

48

Transmission Line Grounding  

Science Conference Proceedings (OSTI)

In 2008, the Electric Power Research Institute (EPRI) published a comprehensive grounding report. Published in two parts, the report covered the theoretical and practical aspects of transmission line grounding practices. To further improve the tools available for grounding analysis, an investigation into practical ways to calculate the fault current distribution and ground potential rise of the transmission line grounding system was conducted. Furthermore, a survey of utilities has documented industry pr...

2011-12-23T23:59:59.000Z

49

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

E-Print Network (OSTI)

and diagnosis for cooling towers. ASHRAE Trans. , vol.107,of faults in the cooling tower circuit of a central chilled

Xu, Peng; Haves, Philip

2002-01-01T23:59:59.000Z

50

NIST Electromechanical Circuit Sets Record Beating ...  

Science Conference Proceedings (OSTI)

... NIST scientists plan to combine the new circuit ... its "ground state," or lowest-energy state ... could be manipulated for the applications mentioned above. ...

2011-10-14T23:59:59.000Z

51

Short-Circuit Modeling of a Wind Power Plant: Preprint  

DOE Green Energy (OSTI)

This paper investigates the short-circuit behavior of a WPP for different types of wind turbines. The short-circuit behavior will be presented. Both the simplified models and detailed models are used in the simulations and both symmetrical faults and unsymmetrical faults are discussed.

Muljadi, E.; Gevorgian, V.

2011-03-01T23:59:59.000Z

52

EPRI Substation Grounding Project  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) has been conducting research in the area of substation grounding and fault current management for several decades. This research has resulted in a large number of reports and other products. To help users locate the results of EPRI’s research in substation grounding and fault current management, an annual update is prepared containing brief descriptions of the products.ObjectiveThe objective of this report is ...

2012-09-06T23:59:59.000Z

53

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 2, is a users manual and an installation and validation manual for the computer program SMECC (Substation Maximum Earth Current Computation Program). This program analyzes the electric current distribution among grounded structures inside and outside a substation for different fault conditions. The fault conditions are automatically selected by the program, or they may be specified by the user, or both. The fault condition resulting in maximum substation earth current is identified and reported. Data requirements for this program are: ground impedance, transformer data, transmission line data, transmission line grounding impedances, etc. The program provides four types of standard outputs: (1) a report of voltages and current flow in the unfaulted system, (2) a brief report of the maximum ground potential rise (worst fault condition), (3) a summary report of all fault conditions which have been analyzed by the program, and (4) a detailed report of voltages and current flow for a selected set of fault conditions.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

54

Controllability of Static CMOS Circuits for Timing Characterization  

Science Conference Proceedings (OSTI)

Timing violations, also known as delay faults, are a major source of defective silicon in modern Integrated Circuits (ICs), designed in Deep Sub-micron (DSM) technologies, making it imperative to perform delay fault testing in these ICs. However, DSM ... Keywords: Delay fault testing, Design for test, Scan design

Ramyanshu Datta; Ravi Gupta; Antony Sebastine; Jacob A. Abraham; Manuel D'Abreu

2008-10-01T23:59:59.000Z

55

ADDER CIRCUIT  

DOE Patents (OSTI)

An improved parallel addition unit is described which is especially adapted for use in electronic digital computers and characterized by propagation of the carry signal through each of a plurality of denominationally ordered stages within a minimum time interval. In its broadest aspects, the invention incorporates a fast multistage parallel digital adder including a plurality of adder circuits, carry-propagation circuit means in all but the most significant digit stage, means for conditioning each carry-propagation circuit during the time period in which information is placed into the adder circuits, and means coupling carry-generation portions of thc adder circuit to the carry propagating means.

Jacobsohn, D.H.; Merrill, L.C.

1959-01-20T23:59:59.000Z

56

Guide for Transmission Line Grounding  

Science Conference Proceedings (OSTI)

Electrical utilities have a duty to provide effective grounding for managing steady-state and fault currents, whether near a large generating station or at a remote distribution pole ground. For transmission lines, this imperative is usually met with investment in overhead ground wires and grounding electrodes. Effective grounding at each tower improves reliability8212by providing low path impedance to lightning strokes8212and contributes to safety. However, the fundamental physical parameters in ground ...

2007-12-20T23:59:59.000Z

57

Passive fault current limiting device  

DOE Patents (OSTI)

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment. 6 figs.

Evans, D.J.; Cha, Y.S.

1999-04-06T23:59:59.000Z

58

PRECISION TIME-DELAY CIRCUIT  

DOE Patents (OSTI)

A tine-delay circuit which produces a delay time in d. The circuit a capacitor, an te back resistance, connected serially with the anode of the diode going to ground. At the start of the time delay a negative stepfunction is applied to the series circuit and initiates a half-cycle transient oscillatory voltage terminated by a transient oscillatory voltage of substantially higher frequency. The output of the delay circuit is taken at the junction of the inductor and diode where a sudden voltage rise appears after the initiation of the higher frequency transient oscillations.

Creveling, R.

1959-03-17T23:59:59.000Z

59

Definition: Automated Distribution Circuit Switches | Open Energy  

Open Energy Info (EERE)

Circuit Switches Circuit Switches Jump to: navigation, search Dictionary.png Automated Distribution Circuit Switches Distribution circuit switches that can be operated automatically in response to control signals from local sensors, distribution automation systems, or grid control systems. Such switches can be installed as automated devices or existing equipment can be retrofitted with controls and communications. The degree of automation depends on the controls and communications system implemented. These switches can be opened or closed to isolate portions of a distribution circuit that has experienced a short circuit (fault), or must be taken out of service for maintenance or other operations. When used in combination, these switches can reroute power from other substations or nearby distribution circuits.[1]

60

Wind Power Plant Enhancement with a Fault-Current Limiter: Preprint  

DOE Green Energy (OSTI)

This paper investigates the capability of a saturable core fault-current limiter to limit the short circuit current of different types of wind turbine generators.

Muljadi, E.; Gevorgian, V.; DeLaRosa, F.

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Hardware Fault Insertion Techniques and Tools  

E-Print Network (OSTI)

The concept of dependability validation becomes more and more important regarding big public telecom systems. This is why fault insertion has been widely accepted as a means of testing the fault handling mechanisms of the systems. This master thesis classifies and compares fault insertion techniques used within the industry. It also looks into internal fault insertion techniques used by the people at Ericsson Telecom working with the AXD301 ATM switch. Hardware Fault Insertion Techniques and Tools 2 Acknowledgements The following people at Ericsson has contributed to this thesis in one way or another: Roger Nordmark Mattias Rimbark Bengt Kvist Anders strm Kenny Ohlsson Johan Jeppson Johan Eklv Also a thank you to my supervisor at KTH: Axel Jantsch A special thanks also to my good friend and colleague: Robert Thorhuus Hardware Fault Insertion Techniques and Tools 3 Abbreviations ASIC - Application Specific Integrated Circuit ATM - Asynchronous Transfer Mode BSDL - Boundary Scan De...

Emil Savqvist; Roger Nordmark; Mattias Rimbark; Bengt Kvist; Anders Åström; Kenny Ohlsson; Johan Eklöv; Axel Jantsch; Robert Thorhuus; Hw Hard Ware

2000-01-01T23:59:59.000Z

62

MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic circuit is presented for automatically computing the product of two selected variables by multiplying the voltage pulses proportional to the variables. The multiplier circuit has a plurality of parallel resistors of predetermined values connected through separate gate circults between a first input and the output terminal. One voltage pulse is applied to thc flrst input while the second voltage pulse is applied to control circuitry for the respective gate circuits. Thc magnitude of the second voltage pulse selects the resistors upon which the first voltage pulse is imprcssed, whereby the resultant output voltage is proportional to the product of the input voltage pulses

Thomas, R.E.

1959-01-20T23:59:59.000Z

63

METHOD OF LOCATING GROUNDS  

DOE Patents (OSTI)

ABS>This patent presents a method for locating a ground in a d-c circult having a number of parallel branches connected across a d-c source or generator. The complete method comprises the steps of locating the ground with reference to the mildpoint of the parallel branches by connecting a potentiometer across the terminals of the circuit and connecting the slider of the potentiometer to ground through a current indicating instrument, adjusting the slider to right or left of the mildpoint so as to cause the instrument to indicate zero, connecting the terminal of the network which is farthest from the ground as thus indicated by the potentiometer to ground through a condenser, impressing a ripple voltage on the circuit, and then measuring the ripple voltage at the midpoint of each parallel branch to find the branch in which is the lowest value of ripple voltage, and then measuring the distribution of the ripple voltage along this branch to determine the point at which the ripple voltage drops off to zero or substantially zero due to the existence of a ground. The invention has particular application where a circuit ground is present which will disappear if the normal circuit voltage is removed.

Macleish, K.G.

1958-02-11T23:59:59.000Z

64

Analysis of Test Generation Complexity for Stuck-At and Path Delay Faults Based on ?k-Notation  

Science Conference Proceedings (OSTI)

In this paper, we discuss the relationship between the test generation complexity for path delay faults (PDFs) and that for stuck-at faults (SAFs) in combinational and sequential circuits using the recently introduced ?k-notation. On ... Keywords: easily testable, path delay faults, stuck-at faults, test generation complexity

Chia Yee Ooi; Thomas Clouqueur; Hideo Fujiwara

2007-08-01T23:59:59.000Z

65

MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic fast multiplier circuit utilizing a transistor controlled voltage divider network is presented. The multiplier includes a stepped potentiometer in which solid state or transistor switches are substituted for mechanical wipers in order to obtain electronic switching that is extremely fast as compared to the usual servo-driven mechanical wipers. While this multiplier circuit operates as an approximation and in steps to obtain a voltage that is the product of two input voltages, any desired degree of accuracy can be obtained with the proper number of increments and adjustment of parameters. (AEC)

Chase, R.L.

1963-05-01T23:59:59.000Z

66

Detect and classify faults using neural nets  

SciTech Connect

The analysis of transmission line faults is essential to the proper performance of the power system. It is required if protective relays are to take the appropriate action and in monitoring the performance of relays, circuit breakers, and other protective and control elements. The detection and classification of transmission line faults is a fundamental component of such fault analysis. Another application of fault analysis is in software packages for automated analysis of digital fault recorder (DFR) files. Recently, such a package, called DFR Assistant, was developed for substation applications. This program can be installed locally in a substation, in which case it is connected directly to the DFR via a high speed parallel link, or it can be installed at a central station, in which case it can be configured to automatically analyze events coming from all DFRs.

Kezunovic, M.; Rikalo, I.

1996-10-01T23:59:59.000Z

67

Fault Locating, Prediction and Protection (FLPPS)  

Science Conference Proceedings (OSTI)

One of the main objectives of this DOE-sponsored project was to reduce customer outage time. Fault location, prediction, and protection are the most important aspects of fault management for the reduction of outage time. In the past most of the research and development on power system faults in these areas has focused on transmission systems, and it is not until recently with deregulation and competition that research on power system faults has begun to focus on the unique aspects of distribution systems. This project was planned with three Phases, approximately one year per phase. The first phase of the project involved an assessment of the state-of-the-art in fault location, prediction, and detection as well as the design, lab testing, and field installation of the advanced protection system on the SCE Circuit of the Future located north of San Bernardino, CA. The new feeder automation scheme, with vacuum fault interrupters, will limit the number of customers affected by the fault. Depending on the fault location, the substation breaker might not even trip. Through the use of fast communications (fiber) the fault locations can be determined and the proper fault interrupting switches opened automatically. With knowledge of circuit loadings at the time of the fault, ties to other circuits can be closed automatically to restore all customers except the faulted section. This new automation scheme limits outage time and increases reliability for customers. The second phase of the project involved the selection, modeling, testing and installation of a fault current limiter on the Circuit of the Future. While this project did not pay for the installation and testing of the fault current limiter, it did perform the evaluation of the fault current limiter and its impacts on the protection system of the Circuit of the Future. After investigation of several fault current limiters, the Zenergy superconducting, saturable core fault current limiter was selected for installation. Because of some testing problems with the Zenergy fault current limiter, installation was delayed until early 2009 with it being put into operation on March 6, 2009. A malfunction of the FCL controller caused the DC power supply to the superconducting magnet to be turned off. This inserted the FCL impedance into the circuit while it was in normal operation causing a voltage resonance condition. While these voltages never reached a point where damage would occur on customer equipment, steps were taken to insure this would not happen again. The FCL was reenergized with load on December 18, 2009. A fault was experienced on the circuit with the FCL in operation on January 14, 2010. The FCL operated properly and reduced the fault current by about 8%, what was expected from tests and modeling. As of the end of the project, the FCL was still in operation on the circuit. The third phase of the project involved the exploration of several advanced protection ideas that might be at a state where they could be applied to the Circuit of the Future and elsewhere in the SCE electrical system. Based on the work done as part of the literature review and survey, as well as a number of internal meetings with engineering staff at SCE, a number of ideas were compiled. These ideas were then evaluated for applicability and ability to be applied on the Circuit of the Future in the time remaining for the project. Some of these basic ideas were implemented on the circuit including measurement of power quality before and after the FCL. It was also decided that we would take what was learned as part of the Circuit of the Future work and extend it to the next generation circuit protection for SCE. Also at this time, SCE put in a proposal to the DOE for the Irvine Smart Grid Demonstration using ARRA funding. SCE was successful in obtaining funding for this proposal, so it was felt that exploration of new protection schemes for this Irvine Smart Grid Demonstration would be a good use of the project resources. With this in mind, a protection system that uses fault interrupting switches, hi

Yinger, Robert, J.; Venkata, S., S.; Centeno, Virgilio

2010-09-30T23:59:59.000Z

68

Stochastic computational models for accurate reliability evaluation of logic circuits  

Science Conference Proceedings (OSTI)

As reliability becomes a major concern with the continuous scaling of CMOS technology, several computational methodologies have been developed for the reliability evaluation of logic circuits. Previous accurate analytical approaches, however, have a ... Keywords: fault tolerance, logic circuits, reliability evaluation, stochastic computation, stochastic computational model

Hao Chen; Jie Han

2010-05-01T23:59:59.000Z

69

TIMING CIRCUIT  

DOE Patents (OSTI)

An electronic circuit is described for precisely controlling the power delivered to a load from an a-c source, and is particularly useful as a welder timer. The power is delivered in uniform pulses, produced by a thyratron, the number of pulses being controlled by a one-shot multivibrator. The starting pulse is synchronized with the a-c line frequency so that each multivlbrator cycle begins at about the same point in the a-c cycle.

Heyd, J.W.

1959-07-14T23:59:59.000Z

70

Assessment of power-frequency based algorithms for fault location in power grids  

Science Conference Proceedings (OSTI)

The increased accuracy of the faults' location is a very actual request of the power grids' operation and management, reason to develop new and as precise as possible techniques for the estimation of the short-circuits' location. The actual fault locating ... Keywords: ATP simulation, fault location, power grids, power-frequency based algorithms

Marcel Istrate

2010-10-01T23:59:59.000Z

71

Dynamic behaviour of a DFIG wind turbine subjected to power system faults  

E-Print Network (OSTI)

Dynamic behaviour of a DFIG wind turbine subjected to power system faults Gabriele Michalke+, Anca of the dynamic interaction between variable speed DFIG wind turbines and the power system subjected to disturbances, such as short circuit faults. Focus of the paper is the fault ride-through capability of DFIG

72

Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system  

E-Print Network (OSTI)

lat- ter would imply subsidence to the east of the fault.indicate uplift, rather subsidence, to the east of the faultlikely involves ground subsidence to the west of the fault.

Fialko, Y

2006-01-01T23:59:59.000Z

73

LOGIC CIRCUIT  

DOE Patents (OSTI)

A device for safety rod counting in a nuclear reactor is described. A Wheatstone bridge circuit is adapted to prevent de-energizing the hopper coils of a ball backup system if safety rods, sufficient in total control effect, properly enter the reactor core to effect shut down. A plurality of resistances form one arm of the bridge, each resistance being associated with a particular safety rod and weighted in value according to the control effect of the particular safety rod. Switching means are used to switch each of the resistances in and out of the bridge circuit responsive to the presence of a particular safety rod in its effective position in the reactor core and responsive to the attainment of a predetermined velocity by a particular safety rod enroute to its effective position. The bridge is unbalanced in one direction during normal reactor operation prior to the generation of a scram signal and the switching means and resistances are adapted to unbalance the bridge in the opposite direction if the safety rods produce a predetermined amount of control effect in response to the scram signal. The bridge unbalance reversal is then utilized to prevent the actuation of the ball backup system, or, conversely, a failure of the safety rods to produce the predetermined effect produces no unbalance reversal and the ball backup system is actuated. (AEC)

Strong, G.H.; Faught, M.L.

1963-12-24T23:59:59.000Z

74

Low Insertion HVDC Circuit Breaker: Magnetically Pulsed Hybrid Breaker for HVDC Power Distribution Protection  

SciTech Connect

GENI Project: General Atomics is developing a direct current (DC) circuit breaker that could protect the grid from faults 100 times faster than its alternating current (AC) counterparts. Circuit breakers are critical elements in any electrical system. At the grid level, their main function is to isolate parts of the grid where a fault has occurred—such as a downed power line or a transformer explosion—from the rest of the system. DC circuit breakers must interrupt the system during a fault much faster than AC circuit breakers to prevent possible damage to cables, converters and other grid-level components. General Atomics’ high-voltage DC circuit breaker would react in less than 1/1,000th of a second to interrupt current during a fault, preventing potential hazards to people and equipment.

None

2012-01-09T23:59:59.000Z

75

Mechanical Models of Fault-Related Folding  

SciTech Connect

The subject of the proposed research is fault-related folding and ground deformation. The results are relevant to oil-producing structures throughout the world, to understanding of damage that has been observed along and near earthquake ruptures, and to earthquake-producing structures in California and other tectonically-active areas. The objectives of the proposed research were to provide both a unified, mechanical infrastructure for studies of fault-related foldings and to present the results in computer programs that have graphical users interfaces (GUIs) so that structural geologists and geophysicists can model a wide variety of fault-related folds (FaRFs).

Johnson, A. M.

2003-01-09T23:59:59.000Z

76

A fuzzy neural network based fault detection scheme for synchronous generator with internal fault  

Science Conference Proceedings (OSTI)

A fuzzy neural network (FNN) based inter-turn short circuit fault detection scheme for generator is proposed. The second harmonic magnitude of field current and the negative sequence components of voltages and currents are used as inputs for the FNN ...

Hongwei Fang; Changliang Xia

2009-08-01T23:59:59.000Z

77

Prototyping a fault-tolerant multiprocessor SoC with run-time fault recovery  

Science Conference Proceedings (OSTI)

Modern integrated circuits (ICs) are becoming increasingly complex. The complexity makes it difficult to design, manufacture and integrate these high performance ICs. The advent of multiprocessor Systems-on-chips (SoCs) makes it even more challenging ... Keywords: fault-tolerance, multiprocessor system, network-on-chip, retargetable simulation, run-time verification, system-on-chip

Xinping Zhu; Wei Qin

2006-07-01T23:59:59.000Z

78

Commutation circuit for an HVDC circuit breaker  

DOE Patents (OSTI)

A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components. 13 figs.

Premerlani, W.J.

1981-11-10T23:59:59.000Z

79

Commutation circuit for an HVDC circuit breaker  

DOE Patents (OSTI)

A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components.

Premerlani, William J. (Scotia, NY)

1981-01-01T23:59:59.000Z

80

High speed, long distance, data transmission multiplexing circuit  

DOE Patents (OSTI)

A high speed serial data transmission multiplexing circuit, which is operable to accurately transmit data over long distances (up to 3 Km), and to multiplex, select and continuously display real time analog signals in a bandwidth from DC to 100 Khz. The circuit is made fault tolerant by use of a programmable flywheel algorithm, which enables the circuit to tolerate one transmission error before losing synchronization of the transmitted frames of data. A method of encoding and framing captured and transmitted data is used which has a low overhead and prevents some particular transmitted data patterns from locking an included detector/decoder circuit.

Mariotti, Razvan (Boulder, CO)

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

A high speed, long distance, data transmission multiplexing circuit  

DOE Patents (OSTI)

A high speed serial data transmission multiplexing circuit, which is operable to accurately transmit data over long distances (up to 3 Km), and to multiplex, select and continuously display real time analog signals in a bandwidth from DC to 100Khz. The circuit is made fault tolerant by use of a programmable flywheel algorithm, which enables the circuit to tolerate one transmission error before losing synchronization of the transmitted frames of data. A method of encoding and framing captured and transmitted data is used which has a low overhead and prevents some particular transmitted data patterns from locking an included detector/decoder circuit. 9 figs.

Mariotti, R.

1990-01-30T23:59:59.000Z

82

Research on Fault Location of Power Cable with Wavelet Analysis  

Science Conference Proceedings (OSTI)

This article researChes for 10kV transmission cable form the ground substation to the underground central substation in the coal mine. The transient traveLing wave signal of the cable fault is disposed by the wavelet transformation based on the cable ... Keywords: Wavelet analysis, Fault Location, TraveLing wave

Ji-meng Zhang; Shuo Liang

2011-08-01T23:59:59.000Z

83

Seasonal variations of grounding parameters by field tests  

SciTech Connect

The past fifteen years have seen considerable research in the area of substation grounding design, analysis and testing. These research include the revision of the IEEE Std.-80, the development of PC based computer programs, the in depth analysis of grounding parameters and the development of new field testing methods and devices. In spite of these advances, several questions were often asked, primarily due to safety concerns. The questions were related to the seasonal variation of critical grounding parameters such as the soil and gravel resistivities and their influence on the body current in an accidental circuit. There was also a need to study the total behavior of a substation ground grid with respect to different weather conditions by performing field tests. In response to the above needs, a comprehensive field test program was developed and implemented. The field test consisted of flowing approximately 150 amperes through the Texas Valley ground grid from a remote substation. The parameters investigated in this project were the grid impedance, the grid potential rise (GPR) , the fault current distribution, the touch/step voltages, the body current on different gravel beds and the soil/gravel resistivities. The measurements were performed in the rainy, winter and summer weather conditions during 1989--1990. The field test results, overall, indicate that the rainy weather is the worst condition for the substation safety because of the substantial reduction in the protective characteristics of the gravel. Among the gravel types, the washed gravel has much superior protective characteristics compared to the crusher run type of gravel. A comparison of SGSYS computed grounding parameters with measured results indicates that the grid resistance and GPR compare well but the computed touch voltage and body current are substantially higher than the measured values.

Patel, S.G. (Georgia Power Co., Forest Park, GA (United States). Research Center)

1992-07-01T23:59:59.000Z

84

New Limits on Fault-Tolerant Quantum Computation  

E-Print Network (OSTI)

We show that quantum circuits cannot be made fault-tolerant against a depolarizing noise level of approximately 45%, thereby improving on a previous bound of 50% (due to Razborov). Our precise quantum circuit model enables perfect gates from the Clifford group (CNOT, Hadamard, S, X, Y, Z) and arbitrary additional one-qubit gates that are subject to that much depolarizing noise. We prove that this set of gates cannot be universal for arbitrary (even classical) computation, from which the upper bound on the noise threshold for fault-tolerant quantum computation follows.

Harry Buhrman; Richard Cleve; Monique Laurent; Noah Linden; Alexander Schrijver; Falk Unger

2006-04-19T23:59:59.000Z

85

Computation of the split factor of earth fault currents by considering the proximity effects  

Science Conference Proceedings (OSTI)

To determine a safe substation grounding grid in power systems, it is important to compute the split factor for earth fault current including the proximity influences among the grid and the earthing systems of the incoming/outgoing transmission lines' ... Keywords: earth fault currents, grounding grid design, proximity effects, split factor, touch and step voltages

N. Ramezani; S. M. Shahrtash

2010-06-01T23:59:59.000Z

86

Model Acceptability Measure for the Identification of Failures in Qualitative Fault Monitoring Systems  

E-Print Network (OSTI)

This paper deals with two of the main tasks of Fault Monitoring Systems (FMS): fault detection and fault identification. During fault detection, the FMS should recognize that the plant behavior is abnormal, and therefore, that the plant is not working properly. During fault identification, the FMS should conclude which type of failure has occurred. The first goal of this work is to consolidate a new fault detection technique, called enveloping, that was developed in the context of the Fuzzy Inductive Reasoning Fault Monitoring System (FIRFMS). The second and primary goal of this paper is to introduce the model acceptability measure as a tool to enhance and make more robust the fault identification process in the context of FIRFMS. The enveloping technique and the model acceptability measure are applied to an electric circuit model previously used for such purpose in the literature. It is shown that the new methods outperform the ones previously advocated in FIRFMS for that purpose 1 ...

Antoni Escobet Angela; Angela Nebot; Francois E. Cellier

1999-01-01T23:59:59.000Z

87

Fault identification in doubly fed induction generator using FFT and neural networks  

Science Conference Proceedings (OSTI)

This paper presents a fault identification system for doubly fed induction generator (DFIG). It considers cases of single phase short-circuits and load switching. The system uses the fast fourier transform (FFT) to preprocessor data, which consist by ... Keywords: fast fourier transform, fault identification, neural network

Marcelo Patrício de Santana; José Roberto Boffino de Almeida Monteiro; Geyverson Teixeira de Paula; Thales Eugenio Portes de Almeida; Gustavo Bueno Romero; Júlio César Faracco

2012-08-01T23:59:59.000Z

88

Fault Modeling and Analysis for Resistive Bridging Defects in a Synchronizer  

Science Conference Proceedings (OSTI)

This paper presents fault modeling and analysis for bridging defects in a synchronizer that is implemented by two D flip-flops. Bridging defects are injected into any two nodes of the synchronizer, and HSPICE is used to perform circuit analysis. The ... Keywords: Bridging defect, Fault modeling, Synchronizer

Hyoung-Kook Kim; Wen-Ben Jone; Laung-Terng Wang

2010-06-01T23:59:59.000Z

89

Neural-network-based fault location estimator for transmission line protection  

Science Conference Proceedings (OSTI)

A classical task in the protection of transmission lines against short circuits is the estimation of the electrical distance to the fault and its comparison against a given threshold to determine whether the line is faulted or not. This paper presents ...

Héctor J. Altuve; Oscar L. Chacón; Ernesto Vázquez; Daniel Posadas; Edgar N. Sánchez

1999-04-01T23:59:59.000Z

90

Neural net application to transmission line fault detection and classification  

E-Print Network (OSTI)

Today, in electric power systems, a large amount of data is made readily available at the occurrence of a fault due to the use of advanced communication systems, digital relays and fault recorders. Such systems are intended to obtain data from contacts of the relays and circuit breakers under operation. In addition, corresponding voltages and currents are recorded during prefault, fault and postfault periods. Restoration of power Systems after a fault occurred requires quick judgment. Hence, fault analysis, as the first step of restoration is very important. However, since faults in power systems are various and relaying systems may be complex, fault analysis is difficult to automate. Common practice in power utility companies, today, is to perform fault analysis by expert operators using their knowledge about the power systems and experience with past faults. Because of the time required to deal with complex fault situations, detailed fault analysis can not be performed by human operators in a short time. Therefore, on-line automated fault analysis system is strongly desired. Traditional approaches to the problem of analysis is to construct a heuristic, rule-based system which embodies a portion of the compiled experience of a human expert. These systems perform fault analysis by mapping fault indications to fault hypotheses. 'These hypotheses are used as inputs for next level of rules. After completion of inferencing process, conclusions are given. The knowledge acquisition process is exhaustive and time consuming. Also, data processing is usually too slow to be effectively applied in a real-time environment. Neural computing is one of the rapidly expanding areas of current research. Neural nets have some obvious advantages over expert systems. They are computationally more effective because of their parallel processing capabilities. Also, there is no need for detailed knowledge acquisition part, because neural nets learn by example. This thesis presents results of a study on using the new neural net system that can perform both on-line and off-line fault detection and classification. Fault analysis is conceptualized as a pattern classification problem which involves the association of input patterns representing the power system state to one or more fault conditions.

Rikalo, Igor

1994-01-01T23:59:59.000Z

91

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other. 5 figures.

Ikezi, H.; Lin-Liu, Y.R.; DeGrassie, J.S.

1991-08-27T23:59:59.000Z

92

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

Ikezi, Hiroyuki (Rancho Santa Fe, CA); Lin-Liu, Yuh-Ren (San Diego, CA); DeGrassie, John S. (Encinitas, CA)

1991-01-01T23:59:59.000Z

93

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission lines between two adjacent periodic intersections to be longer than the other. 5 figs.

Ikezi, Hiroyuki; Lin-Liu, Yuh-Ren; deGrassie, J.S.

1990-03-02T23:59:59.000Z

94

LABORATORY V ELECTRIC CIRCUITS  

E-Print Network (OSTI)

are inside materials such as wires or light bulbs. Even though the interactions of electrons inside materials your track lighting uses. So, you decide to build a model of circuits using two bulbs and compare bulbs are as bright as your reference circuit is equivalent to the circuit that your track lighting uses

Minnesota, University of

95

CIRCUITS FOR CURRENT MEASUREMENTS  

DOE Patents (OSTI)

Circuits are presented for measurement of a logarithmic scale of current flowing in a high impedance. In one form of the invention the disclosed circuit is in combination with an ionization chamber to measure lonization current. The particular circuit arrangement lncludes a vacuum tube having at least one grid, an ionization chamber connected in series with a high voltage source and the grid of the vacuum tube, and a d-c amplifier feedback circuit. As the ionization chamber current passes between the grid and cathode of the tube, the feedback circuit acts to stabilize the anode current, and the feedback voltage is a measure of the logaritbm of the ionization current.

Cox, R.J.

1958-11-01T23:59:59.000Z

96

Apparatus for mounting a diode in a microwave circuit  

DOE Patents (OSTI)

Apparatus for mounting a diode in a microwave circuit for making electrical contact between the circuit and ground and for dissipation of heat between the diode and a heat sink. The diode, supported on a thermally and electrically conductive member, is resiliently pressed in electrical contact with the microwave circuit. A tapered collar on the member is elastically deformably wedged into a tapered aperture formed in a heat sink. The wedged collar tightens firmly around the member establishing good thermal and electrical conduction from the diode to the heat sink and ground. Disassembly is facilitated because of the elastically deformed collar.

Liu, Shing-gong (Princeton, NJ)

1976-07-27T23:59:59.000Z

97

Enhancement of power system transient stability using superconducting fault current limiters  

E-Print Network (OSTI)

Abstract|Transient stability investigations consist in studying the rotor oscillations of generators (electro-mechanic oscillations, 0.1-2 Hz) followed by a fault of large amplitude, e.g. short circuit. The goal is to indicate if the generators are capable to stay synchronous after a fault has occurred. The fault duration is one of the most important factors to be given an answer. In fact, the shorter the fault, the more the maintaining of synchronisation can be guaranteed. Now in case of a fault, a fault current limiter has an extremely fast current transition in comparison with electro-mechanic time constants. This implies a quasi-instantaneous elimination of the fault through a limitation of the current and consequently a better ability to maintain the synchronisation of the system. We recall, in a classic system the elimination of a fault, by opening a circuit breaker, is carried out in two or three cycles in the best case. We have here studied a simple, radial electric network con guration with a machine and an in nite network. The study covers simulations of di erent faults that can occur in a network and the consequences of the recovery time of the fault current limiter. I.

Marten Sjostrom; Rachid Cherkaoui

1999-01-01T23:59:59.000Z

98

Virtual Circuits (OSCARS)  

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

Virtual Circuits (OSCARS) Virtual Circuits (OSCARS) Services Overview ECS Audio/Video Conferencing Fasterdata IPv6 Network Network Performance Tools (perfSONAR) ESnet OID Registry PGP Key Service Virtual Circuits (OSCARS) OSCARS Case Study Documentation Links Hardware Requirements DOE Grids Service Transition Contact Us Technical Assistance: 1 800-33-ESnet (Inside the US) 1 800-333-7638 (Inside the US) 1 510-486-7600 (Globally) 1 510-486-7607 (Globally) Report Network Problems: trouble@es.net Provide Web Site Feedback: info@es.net Virtual Circuits (OSCARS) ESnet's On-Demand Secure Circuits and Advance Reservation System (OSCARS) provides multi-domain, high-bandwidth virtual circuits that guarantee end-to-end network data transfer performance. Originally a research concept, OSCARS has grown into a robust production service. Currently

99

Remote reset circuit  

SciTech Connect

A remote reset circuit acts as a stand-alone monitor and controller by clocking in each character sent by a terminal to a computer and comparing it to a given reference character. When a match occurs, the remote reset circuit activates the system's hardware reset line. The remote reset circuit is hardware based centered around monostable multivibrators and is unaffected by system crashes, partial serial transmissions, or power supply transients.

Gritzo, Russell E. (West Melbourne, FL)

1987-01-01T23:59:59.000Z

100

Remote reset circuit  

DOE Patents (OSTI)

A remote reset circuit acts as a stand-along monitor and controller by clocking in each character sent by a terminal to a computer and comparing it to a given reference character. When a match occurs, the remote reset circuit activates the system's hardware reset line. The remote reset circuit is hardware based centered around monostable multivibrators and is unaffected by system crashes, partial serial transmissions, or power supply transients. 4 figs.

Gritzo, R.E.

1985-09-12T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Gas pressure reduction circuits  

Science Conference Proceedings (OSTI)

This note describes passive pressure reduction devices for use with sensitive instruments. Two gas circuits are developed which not only provide a pressure reduction under flow demand

D. W. Guillaume; D. DeVries

1989-01-01T23:59:59.000Z

102

Solar system fault detection  

SciTech Connect

A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.

Farrington, Robert B. (Wheatridge, CO); Pruett, Jr., James C. (Lakewood, CO)

1986-01-01T23:59:59.000Z

103

Solar system fault detection  

DOE Patents (OSTI)

A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.

Farrington, R.B.; Pruett, J.C. Jr.

1984-05-14T23:59:59.000Z

104

LABORATORY IV ELECTRIC CIRCUITS  

E-Print Network (OSTI)

familiar electric curren ts are inside materials such as wires or light bulbs. Even though the interactions your track lighting uses. You decide to build models of circuits with two bulbs connected across, bulbs, and batteries. Use the accompanying legend to build the circuits. Legend: light bulb ba

Minnesota, University of

105

Grounding intentionality  

E-Print Network (OSTI)

In this thesis, I argue that current attempts to ground intentionality face one of two challenges. Either the grounding feature of intentionality will be itself intentional or the grounding feature is disparate in nature from the representational capacity of an intentional mental state and therefore no connection between the two can be taken to exist. I examine two current accounts of intentionality and the features they utilize to ground it. I maintain that both views fall prey to one or both of the objections I raise. I conclude that any account of intentionality will need to meet both of these challenges in order to be counted successful.

Huizenga Steven R

2004-01-01T23:59:59.000Z

106

Ground Electromagnetic Techniques | Open Energy Information  

Open Energy Info (EERE)

Ground Electromagnetic Techniques Ground Electromagnetic Techniques (Redirected from Ground Electromagnetic Methods) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Electromagnetic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

107

Circuit for monitoring temperature of high-voltage equipment  

DOE Patents (OSTI)

This invention relates to an improved circuit for measuring temperature in a region at high electric potential and generating a read-out of the same in a region at lower potential. The circuit is specially designed to combine high sensitivity, stability, and accuracy. A major portion of the circuit situated in the high-potential region can take the form of an integrated circuit. The preferred form of the circuit includes an input section which is situated in the high-potential region and comprises a temperature-compensated thermocouple circuit for sensing temperature, an oscillator circuit for generating a train of ramp voltages whose rise time varies inversely with the thermocouple output, a comparator and switching circuit for converting the oscillator output to pulses whose frequency is proportional to the thermocouple output, and a light-emitting diode which is energized by these pulses. An optical coupling transmits the light pulses generated by the diode to an output section of the circuit, situated in a region at ground. The output section comprises means for converting the transmitted pulses to electrical pulses of corresponding frequency, means for amplifying the electrical pulses, and means for displaying the frequency of the same. The preferred embodiment of the overall circuit is designed so that the frequency of the output signal in hertz and tenths of hertz is equal to the sensed temperature in degrees and tenths of degrees.

Jacobs, Martin E. (Chillicothe, OH)

1976-01-01T23:59:59.000Z

108

Symmetrical and Unsymmetrical Fault Currents of a Wind Power Plant: Preprint  

DOE Green Energy (OSTI)

This paper investigates the short-circuit behavior of a wind power plant for different types of wind turbines. Both symmetrical faults and unsymmetrical faults are investigated. The size of wind power plants (WPPs) keeps getting bigger and bigger. The number of wind plants in the U.S. has increased very rapidly in the past 10 years. It is projected that in the U.S., the total wind power generation will reach 330 GW by 2030. As the importance of WPPs increases, planning engi-neers must perform impact studies used to evaluate short-circuit current (SCC) contribution of the plant into the transmission network under different fault conditions. This information is needed to size the circuit breakers, to establish the proper sys-tem protection, and to choose the transient suppressor in the circuits within the WPP. This task can be challenging to protec-tion engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper investigates the short-circuit behavior of a WPP for different types of wind turbines. Both symmetrical faults and unsymmetrical faults are investigated. Three different soft-ware packages are utilized to develop this paper. Time domain simulations and steady-state calculations are used to perform the analysis.

Gevorgian, V.; Singh, M.; Muljadi, E.

2011-12-01T23:59:59.000Z

109

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

Science Conference Proceedings (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)

2013-01-01T23:59:59.000Z

110

Transmission Line Protection Support Tools: Fault Location Algorithms and the Potential of Using Intelligent Electronic Device Data for Protection Applications  

Science Conference Proceedings (OSTI)

Overhead transmission lines experience short-circuit faults due to lightning, stormy weather conditions, animal or tree contact, and insulation failure in power system equipment. To ensure continuity of electric service, utilities try to quickly determine the location of the fault, perform maintenance or repair, and return the line to service. Due to advances in modern technology, locating faults in a networked transmission system is now possible with substantial accuracy. Voltage and current ...

2013-12-23T23:59:59.000Z

111

Compensated gain control circuit for buck regulator command charge circuit  

DOE Patents (OSTI)

A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit.

Barrett, David M. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

112

Fault Intersection | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Fault Intersection Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Fault Intersection Dictionary.png Fault Intersection: Fault intersections are junctions between normal faults and either transversely oriented strike-slip or oblique-slip faults. Subsurface fluid flow in these areas is enhanced by multiple minor faults that connect the major intersecting structures, forming highly fractured zones or dilational quadrants with increased permeability. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal

113

Sensor readout detector circuit  

DOE Patents (OSTI)

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems. 6 figs.

Chu, D.D.; Thelen, D.C. Jr.

1998-08-11T23:59:59.000Z

114

Sensor readout detector circuit  

DOE Patents (OSTI)

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems.

Chu, Dahlon D. (Albuquerque, NM); Thelen, Jr., Donald C. (Bozeman, MT)

1998-01-01T23:59:59.000Z

115

Printed circuit board impedance matching step for microwave (millimeter wave) devices  

SciTech Connect

An impedance matching ground plane step, in conjunction with a quarter wave transformer section, in a printed circuit board provides a broadband microwave matching transition from board connectors or other elements that require thin substrates to thick substrate (>quarter wavelength) broadband microwave (millimeter wave) devices. A method of constructing microwave and other high frequency electrical circuits on a substrate of uniform thickness, where the circuit is formed of a plurality of interconnected elements of different impedances that individually require substrates of different thicknesses, by providing a substrate of uniform thickness that is a composite or multilayered substrate; and forming a pattern of intermediate ground planes or impedance matching steps interconnected by vias located under various parts of the circuit where components of different impedances are located so that each part of the circuit has a ground plane substrate thickness that is optimum while the entire circuit is formed on a substrate of uniform thickness.

Pao, Hsueh-Yuan; Aguirre, Jerardo; Sargis, Paul

2013-10-01T23:59:59.000Z

116

A fuzzy approach used in expert system for optimal neutral grounding  

Science Conference Proceedings (OSTI)

In this paper an expert system for selecting the appropriate neutral grounding method in medium voltage distribution network is presented. The grounding method should provide the best response in the case of a single-grounding fault. To fulfill this ... Keywords: fuzzy rules, medium voltage distribution network, neutral grounding method

Toader Dumitru; Lustrea Bucur; Blaj Constantin; Borlea Ioan; Haragus Stefan

2009-03-01T23:59:59.000Z

117

Distribution Grounding of Underground Facilities  

Science Conference Proceedings (OSTI)

This report describes Phase I of a two-phase project to assess industry practices and standards for grounding and bonding of medium-voltage underground residential distribution (URD) and underground commercial distribution (UCD) circuits and worker safety in worksites with these systems.The report includes an overview of the issues and concerns associated with underground distribution systems safety and, in particular, worker safety in worksites. It identifies the industry and utility ...

2013-12-20T23:59:59.000Z

118

Bioluminescent Bioreporter Integrated Circuits  

To address the need for fieldable real-time biological recognition systems, ORNL researchers developed a "laboratory on a chip" using genetically engineered whole cell biosensors attached to integrated circuits (ICs). These bioluminescent ...

119

Optical dynamic circuit services  

Science Conference Proceedings (OSTI)

IP service, leased-line service and POTS service have been the three long-standing communication service offerings of providers. Recently, both commercial and research-andeducation network providers have started offering optical dynamic circuit services. ...

Malathi Veeraraghavan; Mark Karol; George Clapp

2010-11-01T23:59:59.000Z

120

Ground Water  

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

Water Nature Bulletin No. 408-A February 27, 1971 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation GROUND WATER We take...

Note: This page contains sample records for the topic "ground fault circuit" 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.


121

Ground Magnetics | Open Energy Information  

Open Energy Info (EERE)

Ground Magnetics Ground Magnetics Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Magnetics Details Activities (15) Areas (12) Regions (0) NEPA(1) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Magnetic Techniques Parent Exploration Technique: Magnetic Techniques Information Provided by Technique Lithology: Presence of magnetic minerals such as magnetite. Stratigraphic/Structural: Mapping of basement structures, horst blocks, fault systems, fracture zones, dykes and intrusions. Hydrological: The circulation of hydrothermal fluid may impact the magnetic susceptibility of rocks. Thermal: Rocks lose their magnetic properties at the Curie temperature (580° C for magnetite) [1] and, upon cooling, remagnetize in the present magnetic field orientation. The Curie point depth in the subsurface may be determined in a magnetic survey to provide information about hydrothermal activity in a region.

122

Short Circuit Current Contribution for Different Wind Turbine Generator Types  

DOE Green Energy (OSTI)

An important aspect of wind power plant (WPP) impact studies is to evaluate the short circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper represents simulation results for short circuit current contribution for different types of WTGs obtained through transient analysis using generic WTG models. The obtained waveforms are analyzed to explain the behavior, such as peak values and rate of decay, of the WTG. The effect of fault types and location, and the effect of the control algorithms of power converters on SC current contribution are investigated. It is shown that the response of the WPP to faults will vary based on the type of the installed WTGs. While in Type 1 and Type 2 WTGs, short circuit current will be determined by the physical characteristics of the induction generator, the contribu-tion of Type 3 and Type 4 WTG will be mostly characterized by the power converters control algorithms which are usually considered proprietary information by the wind turbine manufacturers.

Muljadi, E.; Samaan, Nader A.; Gevorgian, Vahan; Li, Jun; Pasupulati, Subbaiah

2010-09-28T23:59:59.000Z

123

Circuit simulation: some humbling thoughts  

Science Conference Proceedings (OSTI)

A short, very personal note on circuit simulation is presented. It does neither include theoretical background on circuit simulation, nor offers an overview of available software, but just gives some general remarks for a discussion on circuit simulator needs in context to the design and development of accelerator beam instrumentation circuits and systems.

Wendt, Manfred; /Fermilab

2006-01-01T23:59:59.000Z

124

Quantum Circuit Model Topological Model  

E-Print Network (OSTI)

Quantum Circuit Model Topological Model Comparison of Models Topological Quantum Computation Eric Rowell Texas A&M University October 2010 Eric Rowell Topological Quantum Computation #12;Quantum Circuit Model Topological Model Comparison of Models Outline 1 Quantum Circuit Model Gates, Circuits

Rowell, Eric C.

125

Superconducting flux flow digital circuits  

DOE Patents (OSTI)

A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs) are disclosed. Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics. 8 figs.

Hietala, V.M.; Martens, J.S.; Zipperian, T.E.

1995-02-14T23:59:59.000Z

126

Superconducting flux flow digital circuits  

DOE Patents (OSTI)

A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs). Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics.

Hietala, Vincent M. (Placitas, NM); Martens, Jon S. (Sunnyvale, CA); Zipperian, Thomas E. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

127

The simulation of circuit breaker switching using a composite Cassie-modified Mayr model  

Science Conference Proceedings (OSTI)

In substation electromagnetic compatibility studies or insulation coordination studies it is desirable to get as accurate a representation as possible of the transients generated by faults and switching events. A method of simulating the voltage and current transients generated by a gas blast circuit breaker operation using a composite Cassie-modified Mayr model of the circuit breaker arc is described. It is demonstrated that this gives good agreement with published laboratory measurements of the circuit breaker voltage and current. The transmission line modeling method is used int the construction of the simulation algorithm of the circuit breaker circuit. A method, based on describing the circuit breaker by a transmission-line model (TLM), is used to decouple the non-linear characteristics from the rest of the network.

Thomas, D.W.P.; Pereira, E.T.; Christopoulos, C.; Howe, A.F. [Univ. of Nottingham (United Kingdom). Dept. of Electrical and Electronic Engineering

1995-10-01T23:59:59.000Z

128

Discharge circuits and loads  

SciTech Connect

This will be an overview in which some of the general properties of loads are examined: their interface with the energy storage and switching devices; general problems encountered with different types of loads; how load behavior and fault modes can impact on the design of a power conditioning system (PCS).

Sarjeant, W.J.

1980-10-15T23:59:59.000Z

129

Using Protective Relay Data for Circuit Breaker Diagnostics and Life Management  

Science Conference Proceedings (OSTI)

Recent and new generations of microprocessor-based relays with logic processing and data communications can collect data useful for developing information showing the performance of connected power circuit breakers during interruption of faults, circuit restoration, and normal switching operations. Industry trends and reliability standards initiatives both point to the value of maximizing the use of these data. This technical update describes Electric Power Research Institute (EPRI) research progress in ...

2008-12-11T23:59:59.000Z

130

Ground Electromagnetic Techniques | Open Energy Information  

Open Energy Info (EERE)

Ground Electromagnetic Techniques Ground Electromagnetic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Electromagnetic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature Dictionary.png

131

Computer hardware fault administration  

DOE Patents (OSTI)

Computer hardware fault administration carried out in a parallel computer, where the parallel computer includes a plurality of compute nodes. The compute nodes are coupled for data communications by at least two independent data communications networks, where each data communications network includes data communications links connected to the compute nodes. Typical embodiments carry out hardware fault administration by identifying a location of a defective link in the first data communications network of the parallel computer and routing communications data around the defective link through the second data communications network of the parallel computer.

Archer, Charles J. (Rochester, MN); Megerian, Mark G. (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian E. (Rochester, MN)

2010-09-14T23:59:59.000Z

132

ELECTRONIC TRIGGER CIRCUIT  

DOE Patents (OSTI)

An electronic trigger circuit is described of the type where an output pulse is obtained only after an input voltage has cqualed or exceeded a selected reference voltage. In general, the invention comprises a source of direct current reference voltage in series with an impedance and a diode rectifying element. An input pulse of preselected amplitude causes the diode to conduct and develop a signal across the impedance. The signal is delivered to an amplifier where an output pulse is produced and part of the output is fed back in a positive manner to the diode so that the amplifier produces a steep wave front trigger pulsc at the output. The trigger point of the described circuit is not subject to variation due to the aging, etc., of multi-electrode tabes, since the diode circuit essentially determines the trigger point.

Russell, J.A.G.

1958-01-01T23:59:59.000Z

133

ELECTRONIC MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic multiplier circuit is described in which an output voltage having an amplitude proportional to the product or quotient of the input signals is accomplished in a novel manner which facilitates simplicity of circuit construction and a high degree of accuracy in accomplishing the multiplying and dividing function. The circuit broadly comprises a multiplier tube in which the plate current is proportional to the voltage applied to a first control grid multiplied by the difference between voltage applied to a second control grid and the voltage applied to the first control grid. Means are provided to apply a first signal to be multiplied to the first control grid together with means for applying the sum of the first signal to be multiplied and a second signal to be multiplied to the second control grid whereby the plate current of the multiplier tube is proportional to the product of the first and second signals to be multiplied.

Thomas, R.E.

1959-08-25T23:59:59.000Z

134

Electrical Circuit Tester  

DOE Patents (OSTI)

An electrical circuit testing device is provided, comprising a case, a digital voltage level testing circuit with a display means, a switch to initiate measurement using the device, a non-shorting switching means for selecting pre-determined electrical wiring configurations to be tested in an outlet, a terminal block, a five-pole electrical plug mounted on the case surface and a set of adapters that can be used for various multiple-pronged electrical outlet configurations for voltages from 100 600 VAC from 50 100 Hz.

Love, Frank (Amarillo, TX)

2006-04-18T23:59:59.000Z

135

Small circuits for cryptography.  

SciTech Connect

This report examines a number of hardware circuit design issues associated with implementing certain functions in FPGA and ASIC technologies. Here we show circuit designs for AES and SHA-1 that have an extremely small hardware footprint, yet show reasonably good performance characteristics as compared to the state of the art designs found in the literature. Our AES performance numbers are fueled by an optimized composite field S-box design for the Stratix chipset. Our SHA-1 designs use register packing and feedback functionalities of the Stratix LE, which reduce the logic element usage by as much as 72% as compared to other SHA-1 designs.

Torgerson, Mark Dolan; Draelos, Timothy John; Schroeppel, Richard Crabtree; Miller, Russell D.; Anderson, William Erik

2005-10-01T23:59:59.000Z

136

Dynamic Fault Detection Chassis  

Science Conference Proceedings (OSTI)

Abstract The high frequency switching megawatt-class High Voltage Converter Modulator (HVCM) developed by Los Alamos National Laboratory for the Oak Ridge National Laboratory's Spallation Neutron Source (SNS) is now in operation. One of the major problems with the modulator systems is shoot-thru conditions that can occur in a IGBTs H-bridge topology resulting in large fault currents and device failure in a few microseconds. The Dynamic Fault Detection Chassis (DFDC) is a fault monitoring system; it monitors transformer flux saturation using a window comparator and dV/dt events on the cathode voltage caused by any abnormality such as capacitor breakdown, transformer primary turns shorts, or dielectric breakdown between the transformer primary and secondary. If faults are detected, the DFDC will inhibit the IGBT gate drives and shut the system down, significantly reducing the possibility of a shoot-thru condition or other equipment damaging events. In this paper, we will present system integration considerations, performance characteristics of the DFDC, and discuss its ability to significantly reduce costly down time for the entire facility.

Mize, Jeffery J [ORNL

2007-01-01T23:59:59.000Z

137

Bioluminescent bioreporter integrated circuit  

DOE Patents (OSTI)

Disclosed are monolithic bioelectronic devices comprising a bioreporter and an OASIC. These bioluminescent bioreporter integrated circuit are useful in detecting substances such as pollutants, explosives, and heavy-metals residing in inhospitable areas such as groundwater, industrial process vessels, and battlefields. Also disclosed are methods and apparatus for environmental pollutant detection, oil exploration, drug discovery, industrial process control, and hazardous chemical monitoring.

Simpson, Michael L. (Knoxville, TN); Sayler, Gary S. (Blaine, TN); Paulus, Michael J. (Knoxville, TN)

2000-01-01T23:59:59.000Z

138

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker. 2 figs.

Kozlowski, L.J.; Shirey, L.A.

1992-11-24T23:59:59.000Z

139

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin is installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker.

Kozlowski, L.J.; Shirey, L.A.

1991-12-31T23:59:59.000Z

140

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker.

Kozlowski, Lawrence J. (New Kensington, PA); Shirey, Lawrence A. (North Huntingdon, PA)

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Experiment 2 Meter Circuits  

E-Print Network (OSTI)

1 Experiment 2 Meter Circuits Even in these days of digital circuitry, the d'Arsonval meter to stress a spring. The strain of the spring is read as a deflection of a scale. Most d'Arsonval meter the meter. In this experiment, the basic d'Arsonval meter movement and simple passive circuitry will be used

King, Roger

142

Automatic sweep circuit  

DOE Patents (OSTI)

An automatically sweeping circuit for searching for an evoked response in an output signal in time with respect to a trigger input. Digital counters are used to activate a detector at precise intervals, and monitoring is repeated for statistical accuracy. If the response is not found then a different time window is examined until the signal is found.

Keefe, Donald J. (Lemont, IL)

1980-01-01T23:59:59.000Z

143

Maximum Error Modeling for Fault-Tolerant Computation using Maximum a posteriori (MAP) Hypothesis  

E-Print Network (OSTI)

The application of current generation computing machines in safety-centric applications like implantable biomedical chips and automobile safety has immensely increased the need for reviewing the worst-case error behavior of computing devices for fault-tolerant computation. In this work, we propose an exact probabilistic error model that can compute the maximum error over all possible input space in a circuit specific manner and can handle various types of structural dependencies in the circuit. We also provide the worst-case input vector, which has the highest probability to generate an erroneous output, for any given logic circuit. We also present a study of circuit-specific error bounds for fault-tolerant computation in heterogeneous circuits using the maximum error computed for each circuit. We model the error estimation problem as a maximum a posteriori (MAP) estimate, over the joint error probability function of the entire circuit, calculated efficiently through an intelligent search of the entire input space using probabilistic traversal of a binary join tree using Shenoy-Shafer algorithm. We demonstrate this model using MCNC and ISCAS benchmark circuits and validate it using an equivalent HSpice model. Both results yield the same worst-case input vectors and the highest % difference of our error model over HSpice is just 1.23%. We observe that the maximum error probabilities are significantly larger than the average error probabilities, and provides a much tighter error bounds for fault-tolerant computation. We also find that the error estimates depend on the specific circuit structure and the maximum error probabilities are sensitive to the individual gate failure probabilities.

Karthikeyan Lingasubramanian; Syed M. Alam; Sanjukta Bhanja

2009-06-17T23:59:59.000Z

144

Short circuit power estimation of static CMOS circuits  

Science Conference Proceedings (OSTI)

This paper presents a simple method to estimate short-circuit power dissipation for static CMOS logic circuits. Short-circuit current expression is derived by accurately interpolating peak points of actual current curves which is influenced by the gate-to-drain ...

Seung-Ho Jung; Jong-Humn Baek; Seok-Yoon Kim

2001-01-01T23:59:59.000Z

145

Methods of fabricating applique circuits  

DOE Patents (OSTI)

Applique circuits suitable for advanced packaging applications are introduced. These structures are particularly suited for the simple integration of large amounts (many nanoFarads) of capacitance into conventional integrated circuit and multichip packaging technology. In operation, applique circuits are bonded to the integrated circuit or other appropriate structure at the point where the capacitance is required, thereby minimizing the effects of parasitic coupling. An immediate application is to problems of noise reduction and control in modern high-frequency circuitry.

Dimos, Duane B. (Albuquerque, NM); Garino, Terry J. (Albuquerque, NM)

1999-09-14T23:59:59.000Z

146

Convergence acceleration techniques in CAD systems for grounding analysis in layered soils  

E-Print Network (OSTI)

by ground rods vertically thrusted in certain places of the substation site. Thus, when a fault conditionConvergence acceleration techniques in CAD systems for grounding analysis in layered soils I a numerical formulation based on the Boundary Element Method for the analysis of grounding systems embedded

Colominas, Ignasi

147

Improvement of the computer methods for grounding analysis in layered soils by using  

E-Print Network (OSTI)

of the substation site. Thus, when a fault condition occurs, the grounding grid transports and dissipatesImprovement of the computer methods for grounding analysis in layered soils by using high of grounding systems embedded in uni- form soils. This approach has been implemented in a CAD system

Colominas, Ignasi

148

Optimal partitioned fault-tolerant bus layout for reducing power in nanometer designs  

Science Conference Proceedings (OSTI)

As technology scales down to nanometer dimensions, coupling capacitances between adjacent bus wires grow rapidly, and have a significant impact on power consumption and signal integrity of an integrated circuit. As buses are major components of a design, ... Keywords: coupling capacitance, fault-tolerant, low power, reliability

Shanq-Jang Ruan; Edwin Naroska; Chun-Chih Chen

2006-04-01T23:59:59.000Z

149

Test Generation for Crosstalk-Induced Faults: Framework and Computational Results  

Science Conference Proceedings (OSTI)

Due to technology scaling and increasing clock frequency, problems due to noise effects lead to an increase in design/debugging efforts and a decrease in circuit performance. This paper addresses the problem of efficiently and accurately generating two-vector ... Keywords: crosstalk, fault modeling, mixed-signal test, time-based test generation

Wei-Yu Chen; Sandeep K. Gupta; Melvin A. Breuer

2002-02-01T23:59:59.000Z

150

GAS PHOTOTUBE CIRCUIT  

DOE Patents (OSTI)

This patent pertains to electronic circuits for measuring the intensity of light and is especially concerned with measurement between preset light thresholds. Such a circuit has application in connection with devices for reading-out information stored on punch cards or tapes where the cards and tapes are translucent. By the novel arrangement of this invention thc sensitivity of a gas phototube is maintained at a low value when the light intensity is below a first threshold level. If the light level rises above the first threshold level, the tube is rendered highly sensitive and an output signal will vary in proportion to the light intensity change. When the light level decreases below a second threshold level, the gas phototube is automatically rendered highly insensitive. Each of these threshold points is adjustable.

Richardson, J.H.

1958-03-01T23:59:59.000Z

151

Fault Current Management Guidebook - Updated  

Science Conference Proceedings (OSTI)

Under the new paradigm of power market operation, electric utilities are forcing more power through the existing transmission lines; and these increased loads will increase the fault current level throughout the power system. Also, new generation sources including distributed generation added at the transmission and distribution network will increase power flows and, consequently, fault current levels. Under increased power flow conditions on the existing assets, managing fault currents is crucial in ord...

2007-12-20T23:59:59.000Z

152

Fault Mapping | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » Fault Mapping Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Fault Mapping Details Activities (2) Areas (2) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Field Techniques Exploration Sub Group: Data Collection and Mapping Parent Exploration Technique: Data Collection and Mapping Information Provided by Technique Lithology: Stratigraphic/Structural: Locates active faults in the area of interest Hydrological: Can reveal whether faults are circulating hydrothermal fluids Thermal: Dictionary.png

153

Sequential circuit design for radiation hardened multiple voltage integrated circuits  

DOE Patents (OSTI)

The present invention includes a radiation hardened sequential circuit, such as a bistable circuit, flip-flop or other suitable design that presents substantial immunity to ionizing radiation while simultaneously maintaining a low operating voltage. In one embodiment, the circuit includes a plurality of logic elements that operate on relatively low voltage, and a master and slave latches each having storage elements that operate on a relatively high voltage.

Clark, Lawrence T. (Phoenix, AZ); McIver, III, John K. (Albuquerque, NM)

2009-11-24T23:59:59.000Z

154

Theory of degenerate three-wave mixing using circuit QED in solid-state circuits  

Science Conference Proceedings (OSTI)

We study the theory of degenerate three-wave mixing and the generation of squeezed microwaves using circuit quantum electrodynamics in solid state circuits. The Hamiltonian for degenerate three-wave mixing, which seemed to be given phenomenologically in quantum optics, is derived by quantum mechanical calculations. The nonlinear medium needed in three-wave mixing is composed of a series of superconducting charge qubits which are located inside two superconducting transmission-line resonators. Here, the multiqubit ensemble is present to enhance the effective coupling constant between the two modes in the transmission-line resonators. In the squeezing process, the qubits are kept in their ground states so that their decoherence does not corrupt the squeezing. The main obstacle preventing a large squeezing efficiency is the decay rate of the transmission-line resonator.

Cao, Ye [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Huo, Wen Yi [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Ai, Qing [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China); Long, Gui Lu [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Tsinghua National Laboratory For Information Science and Technology, Beijing 100084 (China)

2011-11-15T23:59:59.000Z

155

Ground resistance of concrete foundations in substation yards  

SciTech Connect

The reinforced concrete foundations in a substation yard have extensive reinforcing steel which is in metallic connection with the laid ground conductor. The foundations may contribute significantly to the dissipation of the fault and leakage currents. Simple to use equations and graphs are presented in this paper to determine the ground resistance of various types of foundations encountered in substation yards. The validity of the analytical approach has been verified with scale model tests. The ground resistance of the foundations estimated as suggested in the paper can be used to evaluate the role of the foundations as grounding element.

Thapar, B.; Ferrer, O. (Montana State Univ., Bozeman, MT (USA)); Blank, D.A. (Bonneville Power Administration, Portland, OR (USA))

1990-01-01T23:59:59.000Z

156

Multiple signal fault detection using fuzzy logic  

Science Conference Proceedings (OSTI)

In this paper, we describe a multiple Signal Fault Detection system that employs fuzzy logic at two levels of detection: signal segment fault and signal fault. The system involves signal segmentation, feature extraction and fuzzy logic based segment ...

Yi Lu Murphey; Jacob Crossman; ZhiHang Chen

2003-06-01T23:59:59.000Z

157

Major Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Major Normal Fault Major Normal Fault Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Major Normal Fault Dictionary.png Major Normal Fault: Normal faults are structures in which the hanging wall is down dropped along the fault plane relative to the foot wall. They are the predominant type of structure in extensional tectonic environments, but are commonly encountered in a number of geologic settings. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal systems: Major Normal Fault Termination of a Major Normal Fault Stepover or Relay Ramp in Normal Fault Zones Apex or Salient of Normal Fault Fault Intersection Accommodation Zone Displacement Transfer Zone Pull-Apart in Strike-Slip Fault Zone

158

Jitter compensation circuit  

DOE Patents (OSTI)

The instantaneous V.sub.co signal on a charging capacitor is sampled and the charge voltage on capacitor C.sub.o is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V.sub. co signal is split between a gain stage (G=0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V.sub.co signal is applied to the negative input of a differential amplifier gain stage (G=10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V.sub.co signal from the instantaneous value of sampled V.sub.co signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V.sub.co values squared divided by the total volt-second product of the magnetic compression circuit.

Sullivan, James S. (Livermore, CA); Ball, Don G. (Livermore, CA)

1997-01-01T23:59:59.000Z

159

Jitter compensation circuit  

DOE Patents (OSTI)

The instantaneous V{sub co} signal on a charging capacitor is sampled and the charge voltage on capacitor C{sub o} is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V{sub co} signal is split between a gain stage (G = 0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V{sub co} signal is applied to the negative input of a differential amplifier gain stage (G = 10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V{sub co} signal from the instantaneous value of sampled V{sub co} signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V{sub co} values squared divided by the total volt-second product of the magnetic compression circuit. 11 figs.

Sullivan, J.S.; Ball, D.G.

1997-09-09T23:59:59.000Z

160

High-voltage crowbar circuit with cascade-triggered series ignitrons  

DOE Patents (OSTI)

A series string of ignitrons for switching a large current at high voltage to ground. Switching is initiated by means of a negative trigger pulse applied to the cathode of the lowest voltage level ignitron next to ground to draw ground current through diodes in the ignitor circuit. The trigger pulse is applied thereby to the next higher ignitron cathode and sequentially to the remainder of the ignitrons in the string through diodes in respective ignitor circuits. Full line voltage is held off of nonconducting diodes and ignitrons by means of varistors.

Baker, William R. (Orinda, CA)

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

High-voltage crowbar circuit with cascade-triggered series ignitrons  

DOE Patents (OSTI)

A series string of ignitrons for switching a large current at high voltage to ground. Switching is initiated by means of a negative trigger pulse applied to the cathode of the lowest voltage level ignitron next to ground to draw ground current through diodes in the ignitor circuit. The trigger pulse is applied thereby to the next higher ignitron cathode and sequentially to the remainder of the ignitrons in the string through diodes in respective ignitor circuits. Full line voltage is held off of nonconducting diodes and ignitrons by means of varistors. 1 fig.

Baker, W.R.

1980-11-04T23:59:59.000Z

162

Groundwater penetrating radar and high resolution seismic for locating shallow faults in unconsolidated sediments  

Science Conference Proceedings (OSTI)

Faults in shallow, unconsolidated sediments, particularly in coastal plain settings, are very difficult to discern during subsurface exploration yet have critical impact to groundwater flow, contaminant transport and geotechnical evaluations. This paper presents a case study using cross-over geophysical technologies in an area where shallow faulting is probable and known contamination exists. A comparison is made between Wenner and dipole-dipole resistivity data, ground penetrating radar, and high resolution seismic data. Data from these methods were verified with a cone penetrometer investigation for subsurface lithology and compared to existing monitoring well data. Interpretations from these techniques are compared with actual and theoretical shallow faulting found in the literature. The results of this study suggests that (1) the CPT study, combined with the monitoring well data may suggest that discontinuities in correlatable zones may indicate that faulting is present (2) the addition of the Wenner and dipole-dipole data may further suggest that offset zones exist in the shallow subsurface but not allow specific fault planes or fault stranding to be mapped (3) the high resolution seismic data will image faults to within a few feet of the surface but does not have the resolution to identify the faulting on the scale of our models, however it will suggest locations for upward continuation of faulted zones (4) offset 100 MHz and 200 MHz CMP GPR will image zones and features that may be fault planes and strands similar to our models (5) 300 MHz GPR will image higher resolution features that may suggest the presence of deeper faults and strands, and (6) the combination of all of the tools in this study, particularly the GPR and seismic may allow for the mapping of small scale, shallow faulting in unconsolidated sediments.

Wyatt, D.E. [Westinghouse Savannah River Co., Aiken, SC (United States)]|[South Carolina Univ., Columbia, SC (United States). Earth Sciences and Resources Inst.; Waddell, M.G. [South Carolina Univ., Columbia, SC (United States). Earth Sciences and Resources Inst.; Sexton, B.G. [Microseeps Ltd., Pittsburgh, PA (United States)

1993-12-31T23:59:59.000Z

163

Spike Neuromorphic Carbon Nanotube Circuits  

E-Print Network (OSTI)

plasticity Power consumption per device/circuit Scalabiiltydevice with low power consumption (nW/device), 2) to build athe learning. Fourth, power consumption per device should be

Kim, Kyunghyun

2013-01-01T23:59:59.000Z

164

Definition: Enhanced Fault Protection | Open Energy Information  

Open Energy Info (EERE)

Enhanced Fault Protection Enhanced Fault Protection Enhanced fault protection requires higher precision and greater discrimination of fault location and type with coordinated measurement among multiple devices. For distribution applications, these systems will detect and isolate faults without full-power re-closing, reducing the frequency of through-fault currents. Using high resolution sensors and fault signatures, these systems can better detect high impedance faults. For transmission applications, these systems will employ high speed communications between multiple elements (e.g., stations) to protect entire regions, rather than just single elements. They will also use the latest digital techniques to advance beyond conventional impedance relaying of transmission lines.[1] Related Terms

165

Definition: Fault Mapping | Open Energy Information  

Open Energy Info (EERE)

Mapping Jump to: navigation, search Dictionary.png Fault Mapping Faults are structural features of crustal rocks that are caused by tectonic forces. These features can create...

166

Ground magnetic survey in the Coso Range, California | Open Energy  

Open Energy Info (EERE)

Ground magnetic survey in the Coso Range, California Ground magnetic survey in the Coso Range, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Ground magnetic survey in the Coso Range, California Details Activities (1) Areas (1) Regions (0) Abstract: A ground magnetic study was completed in the Coso volcanic field to investigate faulting and associated hydrothermal alteration patterns. The magnetic intensity contours match general geologic patterns in varying rock types. Hydrothermally altered rocks along intersecting fault zones show up as strong magnetic lows that form a triangular-shaped area. This area is centered in an area of highest heat flow and is a site of concentrated fumarolic activity. In the Coso volcanic field the combination of high heat flow, fumarolic activity, magnetic lows, and hydrothermal

167

Efficient circuit partitioning to extend cycle simulation beyond synchronous circuits  

Science Conference Proceedings (OSTI)

Cycle simulation techniques, such as levelized compiled code, can ordinarily be applied only to synchronous designs. They usually cannot be applied to designs containing circuit features like combinational paths, multiple clock domains, generated clocks, ... Keywords: logic simulation, cycle simulation, circuit partitioning, levelized compiled code

Charles J. DeVane

1997-11-01T23:59:59.000Z

168

ELECTRONIC INTEGRATING CIRCUIT  

DOE Patents (OSTI)

An electronic integrating circuit using a transistor with a capacitor connected between the emitter and collector through which the capacitor discharges at a rate proportional to the input current at the base is described. Means are provided for biasing the base with an operating bias and for applying a voltage pulse to the capacitor for charging to an initial voltage. A current dividing diode is connected between the base and emitter of the transistor, and signal input terminal means are coupled to the juncture of the capacitor and emitter and to the base of the transistor. At the end of the integration period, the residual voltage on said capacitor is less by an amount proportional to the integral of the input signal. Either continuous or intermittent periods of integration are provided. (AEC)

Englemann, R.H.

1963-08-20T23:59:59.000Z

169

Photoconductive circuit element reflectometer  

DOE Patents (OSTI)

A photoconductive reflectometer for characterizing semiconductor devices at millimeter wavelength frequencies where a first photoconductive circuit element (PCE) is biased by a direct current voltage source and produces short electrical pulses when excited into conductance by short first laser light pulses. The electrical pulses are electronically conditioned to improve the frequency related amplitude characteristics of the pulses which thereafter propagate along a transmission line to a device under test. Second PCEs are connected along the transmission line to sample the signals on the transmission line when excited into conductance by short second laser light pulses, spaced apart in time a variable period from the first laser light pulses. Electronic filters connected to each of the second PCEs act as low-pass filters and remove parasitic interference from the sampled signals and output the sampled signals in the form of slowed-motion images of the signals on the transmission line.

Rauscher, Christen (Alexandria, VA)

1990-01-01T23:59:59.000Z

170

Observer-based fault detection for nuclear reactors  

E-Print Network (OSTI)

This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault ...

Li, Qing, 1972-

2001-01-01T23:59:59.000Z

171

Linear Circuits Designation: Required course  

E-Print Network (OSTI)

circuits. Node and mesh analysis. Operational amplifiers. Signal acquisition and conditioning. Electric, 11k). Objective 4: To acquaint students with the rudiments of electrical-to-mechanical energy) Steady-state and dynamic behavior of linear, lumped-parameter electrical circuits. Kirchoff's laws. RLC

Krstic, Miroslav

172

Online circuit breaker monitoring system  

E-Print Network (OSTI)

Circuit breakers are used in a power system to break or make current flow through power system apparatus. Reliable operation of circuit breakers is very important to the well-being of the power system. Historically this is achieved by regular inspection and maintenance of the circuit breakers. An automated online circuit breaker monitoring system is proposed to monitor condition, operation and status of high and medium voltage circuit breakers. By tracking equipment condition, this system could be used to perform maintenance only when it is needed. This could decrease overall maintenance cost and increase equipment reliability. Using high accurate time synchronization, this system should enable development of system-wide applications that utilize the data recorded by the system. This makes possible tracking sequence of events and making conclusions about their effect on-line. This solution also enables reliable topology analysis, which can be used to improve power flow analysis, state estimation and alarm processing.

Djekic, Zarko

2007-12-01T23:59:59.000Z

173

Resonant Tunneling Device Logic Circuits  

E-Print Network (OSTI)

This report is a summary of the activities in the field of resonant tunneling device circuit design. The presented work has been performed by the Department of Microelectronics of the University of Dortmund (UNIDO) and the Solid-State Electronics Department of the Gerhard-Mercator University of Duisburg (GMUD) during the first year of the Microelectronics Advanced Research Initiative projects ANSWERS (Autonomous Nanoelectronic Systems with Extended Replication and Signalling) and LOCOM (Logic Circuits with Reduced Complexity based on Devices with Higher Functionality). As part of the ANSWERS work-package the principal task of UNIDO is to investigate novel logic circuit architectures for resonant tunneling devices, to perform circuit simulations, and to specify the electrical device parameters. The basic device configuration is a monolithically integrated resonant tunneling diode heterostructure field-effect transistor (RTD-HFET). This device and the demonstrator circuits are fabricated by the LOCOM partner GMUD.

Christian Pacha; Peter Glösekötter; Karl Goser; Werner Prost; Uwe Auer; Franz-J. Tegude

1999-01-01T23:59:59.000Z

174

The bridge-type fault current controller--a new facts controller  

Science Conference Proceedings (OSTI)

The operation of a novel current controller, which can also function as a fault current limiter and as a solid-state ac circuit breaker, is presented. The controller, which consists of a thyristor bridge, an inductor, and an optional bias power supply, is installed in series with the voltage source and the load, For load current values smaller than a preset value, the inductor of the current controller presents no impedance to the ac current flow. For values higher than the preset current value, the inductor is switched automatically into the ac circuit and limits the amount of current flow. Theoretical results in the form of circuit simulations and experimental results with a single-phase unit, operating on a 13.7 kV three-phase system with peak short-circuit currents of 3140 Arms, are presented.

Boenig, Heinrich J.; Mielke, C. H. (Charles H.); Burley, B. L. (Burt L.); Chen, Hong; Waynert, J. A. (Joseph A.); Willis, J. O. (Jeffrey O.)

2002-01-01T23:59:59.000Z

175

EPRI Fault Current Management Guidebook, Fifth Edition  

Science Conference Proceedings (OSTI)

This document is an update of EPRI report 1020029, Fault Current Management Guidebook, Fourth Edition, on fault current effects and management in transmission and distribution systems. This guide is intended to be a snapshot of available references, information, and literature on the effects of high fault current on a number of power system components and various available and emerging fault-current-limiting technologies.

2011-12-19T23:59:59.000Z

176

Memory Fault Modeling Trends: A Case Study  

Science Conference Proceedings (OSTI)

In recent years, embedded memories are the fastest growing segment of system on chip. They therefore have a major impact on the overall Defect per Million (DPM). Further, the shrinking technologies and processes introduce new defects that cause previously ... Keywords: data backgrounds, dynamic faults, fault coverage, fault models, memory tests, static faults

Said Hamdioui; Rob Wadsworth; John Delos Reyes; Ad J. Van De Goor

2004-06-01T23:59:59.000Z

177

Ground Gravity Survey | Open Energy Information  

Open Energy Info (EERE)

Ground Gravity Survey Ground Gravity Survey Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Gravity Survey Details Activities (48) Areas (34) Regions (2) NEPA(2) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Gravity Techniques Parent Exploration Technique: Gravity Techniques Information Provided by Technique Lithology: Distribution of density in the subsurface enables inference of rock type. Stratigraphic/Structural: Delineation of steeply dipping formations, geological discontinuities and faults, intrusions and large-scale deposition of silicates due to hydrothermal activity. Hydrological: Density of sedimentary rocks are strongly influenced by fluid contained within pore space. Dry bulk density refers to the rock with no moisture, while the wet bulk density accounts for water saturation; fluid content may alter density by up to 30%.(Sharma, 1997)

178

Fault Tree Analysis - A Bibliography  

Science Conference Proceedings (OSTI)

Fault tree analysis is a top-down approach to the identification of process hazards. It is touted as one of the best methods for systematically identifying and graphically displaying the many ways something can go wrong. This bibliography references ...

Program NASA Scientific and Technical Information

2000-07-01T23:59:59.000Z

179

SWIFT: Software Implemented Fault Tolerance  

Science Conference Proceedings (OSTI)

To improve performance and reduce power, processor designers employ advances that shrink feature sizes, lower voltage levels, reduce noise margins, and increase clock rates. However, these advances make processors more susceptible to transient faults ...

George A. Reis; Jonathan Chang; Neil Vachharajani; Ram Rangan; David I. August

2005-03-01T23:59:59.000Z

180

Solid-state circuit breaker with current-limiting characteristic using a superconducting coil  

DOE Patents (OSTI)

A thyristor bridge interposes an ac source and a load. A series connected DC source and superconducting coil within the bridge biases the thyristors thereof so as to permit bidirectional ac current flow therethrough under normal operating conditions. Upon a fault condition a control circuit triggers the thyristors so as to reduce ac current flow therethrough to zero in less than two eyeles and to open the bridge thereafter. Upon a temporary overload condition the control circuit triggers the thyristors so as to limit ac current flow therethrough to an acceptable level.

Boenig, H.J.

1982-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Solid-state circuit breaker with current limiting characteristic using a superconducting coil  

DOE Patents (OSTI)

A thyristor bridge interposes an ac source and a load. A series connected DC source and superconducting coil within the bridge biases the thyristors thereof so as to permit bidirectional ac current flow therethrough under normal operating conditions. Upon a fault condition a control circuit triggers the thyristors so as to reduce ac current flow therethrough to zero in less than two cycles and to open the bridge thereafter. Upon a temporary overload condition the control circuit triggers the thyristors so as to limit ac current flow therethrough to an acceptable level.

Boenig, Heinrich J. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

182

Overpulse railgun energy recovery circuit  

DOE Patents (OSTI)

The invention presented relates to a high-power pulsing circuit and more particularly to a repetitive pulse inductive energy storage and transfer circuit for an electromagnetic launcher. In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, an overpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, E.M.

1984-09-28T23:59:59.000Z

183

Counterpulse railgun energy recovery circuit  

DOE Patents (OSTI)

The invention presented relates to a high-power pulsing circuit and more particularly to a repetitive pulse inductive energy storage and transfer circuit for an electromagnetic launcher. In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, a counterpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, E.M.

1984-09-28T23:59:59.000Z

184

Electronic circuit for measuring series connected ...  

An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The electronic circuit includes a plurality of energy storage cells ...

185

Grounding studies in a medium voltage DC shipboard power system with uncertain parameters  

Science Conference Proceedings (OSTI)

In this paper, the response surface modeling approach is applied to study the effectiveness of different grounding schemes implemented for the mitigation of single-line-to-ground faults in a simulation of a notional Medium Voltage DC shipboard power ... Keywords: Gaussian process model, Sobol indices, multivariate adaptive regression splines (MARS)

Dorca Lee; Diomar Infante; James Langston; Svetlana V. Poroseva; Michael Steurer; Thomas Baldwin

2010-07-01T23:59:59.000Z

186

Global Circuit Model with Clouds  

Science Conference Proceedings (OSTI)

Cloud data from the International Satellite Cloud Climatology Project (ISCCP) database have been introduced into the global circuit model developed by Tinsley and Zhou. Using the cloud-top pressure data and cloud type information, the authors ...

Limin Zhou; Brian A. Tinsley

2010-04-01T23:59:59.000Z

187

Battery charging and testing circuit  

SciTech Connect

A constant current battery charging circuit is provided by which the battery receives a full charge until the battery voltage reaches a threshold. When the battery voltage is above the threshold, the battery receives a trickle charge. The actual battery voltage is compared with a reference voltage to determine whether the full charge circuit should be in operation. Hysteresis is provided for preventing a rapid on/off operation around the threshold. The reference voltage is compensated for temperature variations. The hysteresis system and temperature compensation system are independent of each other. A separate test circuit is provided for testing the battery voltage. During testing of the battery, the full charge circuit is inoperative.

Wicnienski, M. F.; Charles, D. E.

1984-01-17T23:59:59.000Z

188

Investigation of Auxiliary Power Substation 95A4 fault and fire, Portsmouth Gaseous Diffusion Plant, March 24, 1982  

SciTech Connect

On March 24, 1982, an electrical fault and resultant fire in the 480 volt Auxiliary Power Substation 95A4 at the Portsmouth Gaseous Diffusion Plant destroyed that substation. There were no personal injuries, the overall loss was limited to the Substation, and the cost of replacing the Substation with repaired and new components has been estimated at $184,000. At the time of the incident, Goodyear was involved in a project to replace the obsolete 480 volt circuit breaker of the Auxiliary Power System. This project involved the disassembly, refurishing, and reassembly of 480 volt circuit breaker carriages by Goodyear personnel. The fault occurred in a circuit breaker upgraded under this project. The investigation of this accident is reported. The evidence suggests the fault resulted from the improper assembly of an upgraded 480 volt circuit breaker. Compounding the problem and leading to the extensive damage was the failure of the transformer secondary breaker to trip open as designed and interrupt the flow of power to the substation. It is surmised that inadequate testing during preventive maintenance contributed to this condition. Additional factors which may have contributed to the accident included: no requirements for assuring the competence of the electricians who installed the circuit breakers, no specific assembly instructions to the electricians, inadequate procedure instructions, and an inadequate procedure governing operational or load testing of the breaker. (LCL)

1982-06-01T23:59:59.000Z

189

Reverse engineering of integrated circuits  

DOE Patents (OSTI)

Software and a method therein to analyze circuits. The software comprises several tools, each of which perform particular functions in the Reverse Engineering process. The analyst, through a standard interface, directs each tool to the portion of the task to which it is most well suited, rendering previously intractable problems solvable. The tools are generally used iteratively to produce a successively more abstract picture of a circuit, about which incomplete a priori knowledge exists.

Chisholm, Gregory H. (Shorewood, IL); Eckmann, Steven T. (Colorado Springs, CO); Lain, Christopher M. (Pittsburgh, PA); Veroff, Robert L. (Albuquerque, NM)

2003-01-01T23:59:59.000Z

190

Fault detection of fault ride through for doubly-fed induction generator based wind energy systems.  

E-Print Network (OSTI)

??Fault detection and mitigation is of high importance for existing DFIG based wind energy conversion systems. Keeping the doubly-fed induction generator (DFIG) online during faults… (more)

Ramroop, Shoba AD

2008-01-01T23:59:59.000Z

191

Faster Quantum Number Factoring via Circuit Synthesis  

E-Print Network (OSTI)

A major obstacle to implementing Shor's quantum number-factoring algorithm is the large size of modular-exponentiation circuits. We reduce this bottleneck by customizing reversible circuits for modular multiplication to individual runs of Shor's algorithm. Our circuit-synthesis procedure exploits spectral properties of multiplication operators and constructs optimized circuits from the traces of the execution of an appropriate GCD algorithm. Empirically, gate counts are reduced by 4-5 times, and circuit latency is reduced by larger factors.

Igor L. Markov; Mehdi Saeedi

2013-01-15T23:59:59.000Z

192

Definition: Fault Current Limiting | Open Energy Information  

Open Energy Info (EERE)

Limiting Limiting Jump to: navigation, search Dictionary.png Fault Current Limiting Fault current limiting can be achieved through sensors, communications, information processing, and actuators that allow the utility to use a higher degree of network coordination to reconfigure the system to prevent fault currents from exceeding damaging levels. Fault current limiting can also be achieved through the implementation of special stand alone devices known as Fault Current Limiters (FCLs) which act to automatically limit high through currents that occur during faults.[1] Related Terms fault, fault current limiter References ↑ SmartGrid.gov 'Description of Functions' Temp LikeLike UnlikeLike You like this.Sign Up to see what your friends like. late:ISGANAttributionsmart grid,smart grid,smart grid,smart grid,

193

Quaternary faulting of Deschutes County, Oregon.  

E-Print Network (OSTI)

??Sixty-one normal faults were identified in a 53-kilometer long by 21-kilometer wide northwest-trending zone in central and northern Deschutes County, Oregon. The faults are within… (more)

Wellik, John M.

2008-01-01T23:59:59.000Z

194

Fault diagnosis and fault tolerant control using set-membership approaches: Application to real case studies  

Science Conference Proceedings (OSTI)

This paper reviews the use of set-membership methods in fault diagnosis (FD) and fault tolerant control (FTC). Setmembership methods use a deterministic unknown-but-bounded description of noise and parametric uncertainty (interval ... Keywords: Fault Detection, Fault-Tolerant Control, Interval Models, Robustness, Set-Membership

Vicenç Puig

2010-12-01T23:59:59.000Z

195

Benchmarking of Fault-Location Technologies  

Science Conference Proceedings (OSTI)

This report resumes the studies on fault-location technologies that were conducted in 2009. These studies were undertaken in a joint project done with the collaboration of Hydro-Qubec, Long Island Power Authority, and the Electric Power Research Institute (EPRI). Two fault-location technologies were tested, the Reactance to Fault (RTF) implemented in the PQView application and the Voltage Drop Fault Location (VDFL) implemented in the MILE application. The RTF is based on substation voltage and current me...

2011-03-31T23:59:59.000Z

196

Application of Control Charts for Detecting Faults in Variable ...  

Science Conference Proceedings (OSTI)

... where Tzone = zone temperature, CSP = cooling setpoint ... Fault Implementation and Impact To test ... fault imple- mentations and impacts are provided ...

197

Circuit breaker lock out assembly  

DOE Patents (OSTI)

A lock out assembly for a circuit breaker which consists of a generally step-shaped unitary base with an aperture in the small portion of the step-shaped base and a roughly S shaped retaining pin which loops through the large portion of the step-shaped base. The lock out assembly is adapted to fit over a circuit breaker with the handle switch projecting through the aperture, and the retaining pin projecting into an opening of the handle switch, preventing removal.

Gordy, W.T.

1983-05-18T23:59:59.000Z

198

Circuit breaker lock out assembly  

Science Conference Proceedings (OSTI)

A lock out assembly for a circuit breaker which consists of a generally step-shaped unitary base with an aperture in the small portion of the step-shaped base and a roughly "S" shaped retaining pin which loops through the large portion of the step-shaped base. The lock out assembly is adapted to fit over a circuit breaker with the handle switch projecting through the aperture, and the retaining pin projecting into an opening of the handle switch, preventing removal.

Gordy, Wade T. (Jackson, SC)

1984-01-01T23:59:59.000Z

199

Sensor/source electrometer circuit  

DOE Patents (OSTI)

A multiple decade electrometer circuit is claimed which can measure low input currents or act as a current source and is comprised of a microprocessor controlled digital to analog converters to derive individual decades. A plurality of decades are created by multiple D-A voltage sources which generate electrometer currents through scaled resistors. After a first series of decades of current are successively produced, the converters are 10 cycled to generate current through new resistors scaled to produce another series decades of current. In this manner, the electrometer circuit generates or senses a plurality of decades of current without significant scale change.

Hughes, W.J.

1991-12-31T23:59:59.000Z

200

Autonomic fault mitigation in embedded systems  

Science Conference Proceedings (OSTI)

Autonomy, particularly from a maintenance and fault-management perspective, is an increasingly desirable feature in embedded (and non-embedded) computer systems. The driving factors are several-including increasing pervasiveness of computer systems, ... Keywords: Autonomic computing, Embedded systems, Fault mitigation, Fault tolerance, Hierarchical concurrent finite-state machines, Model-based design

Sandeep Neema; Ted Bapty; Shweta Shetty; Steven Nordstrom

2004-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Fault detection and diagnosis of technical systems  

Science Conference Proceedings (OSTI)

Sensors, actuators and/or physical components in technical systems are often affected by unpermitted or un-expected deviations from normal operation behaviour. The fault diagnosis task consists of determination of the fault type with as many details ... Keywords: fault detection and diagnosis, residuals, symptoms, technical systems

Ioana Fagarasan; S. ST. Iliescu

2008-06-01T23:59:59.000Z

202

CRT RSA algorithm protected against fault attacks  

Science Conference Proceedings (OSTI)

Embedded devices performing RSA signatures are subject to Fault Attacks, particularly when the Chinese Remainder Theorem is used. In most cases, the modular exponentiation and the Garner recombination algorithms are targeted. To thwart Fault Attacks, ... Keywords: RSA, chinese remainder theorem, fault attacks, modular exponentiation, simple power analysis, smart card

Arnaud Boscher; Robert Naciri; Emmanuel Prouff

2007-05-01T23:59:59.000Z

203

Designing Fault-Tolerant Mobile Systems  

Science Conference Proceedings (OSTI)

The purpose of this paper is to investigate how several innovative techniques, not all initially intended for fault-tolerance, can be applied in providing fault tolerance of complex mobile agent systems. Due to their roaming nature, mobile agents usually ... Keywords: exception handling, fault tolerance, mobile agents, software engineering, system structuring

Giovanna Di Marzo Serugendo; Alexander B. Romanovsky

2002-11-01T23:59:59.000Z

204

Electrical Subsurface Grounding Analysis  

SciTech Connect

The purpose and objective of this analysis is to determine the present grounding requirements of the Exploratory Studies Facility (ESF) subsurface electrical system and to verify that the actual grounding system and devices satisfy the requirements.

J.M. Calle

2000-11-01T23:59:59.000Z

205

Coping with buffer delay change due to power and ground noise  

Science Conference Proceedings (OSTI)

Variation of power and ground levels affect VLSI circuit performance. Trends in device technology and in packaging have necessitated a revision in conventional delay models. In particular, simple scalable models are needed to predict delays in the presence ... Keywords: common mode noise, differential mode noise, incremental delay change, power and ground noise

Lauren Hui Chen; Malgorzata Marek-Sadowska; Forrest Brewer

2002-06-01T23:59:59.000Z

206

Wavelet based analysis of circuit breaker operation  

E-Print Network (OSTI)

Circuit breaker is an important interrupting device in power system network. It usually has a lifetime about 20 to 40 years. During breaker's service time, maintenance and inspection are imperative duties to achieve its reliable operation. To automate the diagnostic practice for circuit breaker operation and reduce the utility company's workload, Wavelet based analysis software of circuit breaker operation is developed here. Combined with circuit breaker monitoring system, the analysis software processes the original circuit breaker information, speeds up the analysis time and provides stable and consistent evaluation for the circuit breaker operation.

Ren, Zhifang Jennifer

2006-05-01T23:59:59.000Z

207

Battery charger polarity circuit control  

SciTech Connect

A normally open polarity sensing circuit is interposed between the charging current output of a battery charger and battery terminal clamps connected with a rechargeable storage battery. Normally open reed switches, closed by battery positive terminal potential, gates silicon controlled recitifiers for battery charging current flow according to the polarity of the battery.

Santilli, R.R.

1982-11-30T23:59:59.000Z

208

Pattern Of Shallow Ground Water Flow At Mount Princeton Hot Springs,  

Open Energy Info (EERE)

Pattern Of Shallow Ground Water Flow At Mount Princeton Hot Springs, Pattern Of Shallow Ground Water Flow At Mount Princeton Hot Springs, Colorado, Using Geoelectrical Methods Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Pattern Of Shallow Ground Water Flow At Mount Princeton Hot Springs, Colorado, Using Geoelectrical Methods Details Activities (2) Areas (1) Regions (0) Abstract: In geothermal fields, open faults and fractures often act as high permeability pathways bringing hydrothermal fluids to the surface from deep reservoirs. The Mount Princeton area, in south-central Colorado, is an area that has an active geothermal system related to faulting and is therefore a suitable natural laboratory to test geophysical methods. The Sawatch range-front normal fault bordering the half-graben of the Upper Arkansas

209

Reliability-yield allocation for semiconductor integrated circuits: modeling and optimization  

E-Print Network (OSTI)

This research develops yield and reliability models for fault-tolerant semiconductor integrated circuits and develops optimization algorithms that can be directly applied to these models. Since defects cause failures in microelectronics systems, accurate yield and reliability models considering these defects as well as optimization techniques determining efficient defect-tolerant schemes are essential in semiconductor manufacturing and nanomanufacturing to ensure manufacturability and productivity. The defect-based yield model considers various types of failures, fault-tolerant schemes such as hierarchical redundancy and error correcting code, and burn-in effects, simultaneously. The reliability model counts on carry-over single-cell failures accompanied by the failure rate of the semiconductor integrated circuits under the assumption of an error correcting code policy. The redundancy allocation problem, which seeks to ?nd an optimal allocation of redundancy that maximizes system reliability, is one of the representative problems in reliability optimization. The problem is typically formulated as a nonconvex integer nonlinear programming problem that is nonseparable and coherent. Two iterative heuristics, tree and scanning heuristics, and variants are studied to obtain local optima and a branch-and-bound algorithm is proposed to ?nd the global optimum for redundancy allocation problems. The proposed algorithms engage a multiple-search paths strategy to accelerate efficiency. Experimental results of these algorithms indicate that they are superior to the existing algorithms in terms of computation time and solution quality. An example of memory semiconductor integrated circuits is presented to show the applicability of both the yield and reliability models and the optimization algorithms to fault-tolerant semiconductor integrated circuits.

Ha, Chunghun

2004-08-01T23:59:59.000Z

210

Analysis of Power-Clocked CMOS with Application to the Design of Energy-Recovery Circuits*  

E-Print Network (OSTI)

Analysis of Power-Clocked CMOS with Application to the Design of Energy-Recovery Circuits* Massoud to the ground terminal, resulting in an irreversible energy conversion from electric energy to heat. As a result of energy conversion, i.e., one that minimizes the conversion of electric energy to heat. An energy

Pedram, Massoud

211

Soliton quenching NLTL impulse circuit with a pulse forming network at the output  

DOE Patents (OSTI)

An impulse forming circuit is disclosed which produces a clean impulse from a nonlinear transmission line compressed step function without customary soliton ringing by means of a localized pulse shaping and differentiating network which shunts the nonlinear transmission line output to ground.

McEwan, Thomas E. (Livermore, CA); Dallum, Gregory E. (Livermore, CA)

1998-01-01T23:59:59.000Z

212

Fault-tolerant Operations for Universal Blind Quantum Computation  

E-Print Network (OSTI)

Blind quantum computation is an appealing use of quantum information technology because it can conceal both the client's data and the algorithm itself from the server. However, problems need to be solved in the practical use of blind quantum computation and fault-tolerance is a major challenge. On an example circuit, the computational cost measured in T gates executed by the client is 97 times more than performing the original computation directly, without using the server, even before applying error correction. (The client still benefits due to drastically reduced memory requirements.) Broadbent et al. proposed running error correction over blind computation, but our first protocol applies one layer of Steane's [[7,1,3

Chia-Hung Chien; Rodney Van Meter; Sy-Yen Kuo

2013-06-16T23:59:59.000Z

213

Energy Bounds for Fault-Tolerant Nanoscale Designs  

E-Print Network (OSTI)

The problem of determining lower bounds for the energy cost of a given nanoscale design is addressed via a complexity theory-based approach. This paper provides a theoretical framework that is able to assess the trade-offs existing in nanoscale designs between the amount of redundancy needed for a given level of resilience to errors and the associated energy cost. Circuit size, logic depth and error resilience are analyzed and brought together in a theoretical framework that can be seamlessly integrated with automated synthesis tools and can guide the design process of nanoscale systems comprised of failure prone devices. The impact of redundancy addition on the switching energy and its relationship with leakage energy is modeled in detail. Results show that 99% error resilience is possible for fault-tolerant designs, but at the expense of at least 40% more energy if individual gates fail independently with probability of 1%.

Marculescu, Diana

2011-01-01T23:59:59.000Z

214

Vertical Circuits Inc | Open Energy Information  

Open Energy Info (EERE)

Circuits Inc Circuits Inc Jump to: navigation, search Name Vertical Circuits, Inc. Place Scotts Valley, California Zip 95066 Sector Services Product Vertical Circuits Inc. is a global supplier of advanced die level vertical interconnect packaging technology, products, services and intellectual property for the manufacture of low cost ultra high-speed/high-density semiconductor components. References Vertical Circuits, Inc.[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Vertical Circuits, Inc. is a company located in Scotts Valley, California . References ↑ "Vertical Circuits, Inc." Retrieved from "http://en.openei.org/w/index.php?title=Vertical_Circuits_Inc&oldid=352802"

215

Post regulation circuit with energy storage  

DOE Patents (OSTI)

A charge regulation circuit provides regulation of an unregulated voltage supply and provides energy storage. The charge regulation circuit according to the present invention provides energy storage without unnecessary dissipation of energy through a resistor as in prior art approaches.

Ball, Don G. (Livermore, CA); Birx, Daniel L. (Oakley, CA); Cook, Edward G. (Livermore, CA)

1992-01-01T23:59:59.000Z

216

Quantum Circuit Simulation, 1st edition  

Science Conference Proceedings (OSTI)

Quantum Circuit Simulation covers the fundamentals of linear algebra and introduces basic concepts of quantum physics needed to understand quantum circuits and algorithms. It requires only basic familiarity with algebra, graph algorithms and computer ...

George F. Viamontes; Igor L. Markov; John P. Hayes

2009-12-01T23:59:59.000Z

217

Dual-circuit segmented rail phased induction motor - Energy ...  

An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The ...

218

A methodology for experimentally verifying simulation models for distribution transformer internal faults  

E-Print Network (OSTI)

Internal winding faults comprise 70-80% of modem transformer breakdown. In this era of deregulation, this phenomenon is likely to increase since loading transformers to their optimum capacity is becoming normal practice. These internal faults result from degradation of the transformer winding insulation, which tends to cause a breakdown in the dielectric strength. This breakdown either causes adjacent windings to short or a winding to be shorted to a grounded part of the transformer. Such faults can be very catastrophic and hence expensive. Utilities therefore welcome inexpensive methods employed to detect such faults in the incipient stage. The long-term objective of this research is the development of an inexpensive technique for the detection of transformer incipient winding faults. As part of this research, the thesis presents: 1. Internal winding models of single-phase, distribution transformers. These models are adapted from an earlier work of modeling internal winding faults of three-phase power transformers. They are compatible with the Alternative Transients Program and enable the transformer winding terminal parameters to be monitored. They allow the simulation of faults between any turn and the earth or between any two turns of the transformer windings. 2. Simulation of various internal winding faults of a single-phase distribution transformer using the models. 3. A general methodology to experimentally verify simulation models for distribution transformer internal winding faults including details of the design and layout of a field experimental setup containing a 25kVA, 7200V/240V/120V single-phase, custom-built transformer and a 25kW resistor load bank. 4. A comparison of the simulation and corresponding field experiment results. Although the simulation models neglected factors such as saturation and consequently transformer nonlinearities, the simulation and field results were very similar. As a contribution, the experimental setup presented in this work could generally be used for simulation model verification by following the proposed methodology with appropriate modifications. The validated models can be utilized to generate fault data for all kinds of scenarios including those that would be impossible to stage experimentally due to high levels of fault currents. These data can be used as a basis for a single-phase transformer incipient fault detection system.

Palmer-Buckle, Peter

1999-01-01T23:59:59.000Z

219

ENHANCEMENT OF ORGANIC PHOTOVOLTAIC CELL OPEN CIRCUIT ...  

enhancement of organic photovoltaic cell open circuit voltage using electron/hole blocking exciton blocking layers united states patent application

220

Fault-ignorant Quantum Search  

E-Print Network (OSTI)

We investigate the problem of quantum searching on a noisy quantum computer. Taking a 'fault-ignorant' approach, we analyze quantum algorithms that solve the task for various different noise strengths, which are possibly unknown beforehand. We prove lower bounds on the runtime of such algorithms and thereby find that the quadratic speedup is necessarily lost (in our noise models). However, for low but constant noise levels the algorithms we provide (based on Grover's algorithm) still outperform the best noiseless classical search algorithm.

Peter Vrana; David Reeb; Daniel Reitzner; Michael M. Wolf

2013-07-02T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

NPTEL Syllabus Basic Electrical Circuits -Video course  

E-Print Network (OSTI)

with an introduction to basic linear elements used in electrical circuits. Mesh and node analysis for systematic and energy in circuits will be discussed. Rudiments of three-phase circuits and their analysis; Energy in a mutual inductor and constraint on mutual inductance 5 Nodal analysis of a network

Krishnapura, Nagendra

222

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current.

Steinkraus, Jr., Robert F. (Livermore, CA)

1994-01-01T23:59:59.000Z

223

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current. 6 figures.

Steinkraus, R.F. Jr.

1994-12-13T23:59:59.000Z

224

Condition responsive battery charging circuit  

SciTech Connect

A battery charging circuit includes a ferroresonant transformer having a rectified output for providing a constant output voltage to be supplied to a battery to be charged. Battery temperature is sensed providing an input to a control circuit which operates a shunt regulator associated with the ferroresonant transformer to provide battery charge voltage as a function of battery temperature. In response to a high battery temperature the controller functions to lower the output voltage to the battery, and in response to a low battery temperature, operates to provide a higher output voltage, with suitable control for any battery temperature between minus 10* and plus 150* fahrenheit. As the battery approaches full charge and battery acceptance current falls below a predetermined level, a charge cycle termination control allows charging to continue for a period preset by the operator, at the end of which period, line voltage is removed from the charger thereby terminating the charge cycle.

Reidenbach, S.G.

1980-06-24T23:59:59.000Z

225

Delta connected resonant snubber circuit  

SciTech Connect

A delta connected, resonant snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the dc supply voltage through the main inverter switches and the auxiliary switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter.

Lai, Jih-Sheng (Knoxville, TN); Peng, Fang Zheng (Oak Ridge, TN); Young, Sr., Robert W. (Oak Ridge, TN); Ott, Jr., George W. (Knoxville, TN)

1998-01-01T23:59:59.000Z

226

Delta connected resonant snubber circuit  

DOE Patents (OSTI)

A delta connected, resonant snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the dc supply voltage through the main inverter switches and the auxiliary switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter. 36 figs.

Lai, J.S.; Peng, F.Z.; Young, R.W. Sr.; Ott, G.W. Jr.

1998-01-20T23:59:59.000Z

227

Control circuit for combustion systems  

SciTech Connect

A control circuit is described for gas fired burners and the like such as are employed in commercial laundry fabric ironers requiring the energization of a blower motor and the resulting opening of a gas valve and ignition of a gas burner only after an air pressure sensitive switch is actuated through the operation of the blower motor for purging the system of combustible gases.

Kamberg, E.

1981-11-10T23:59:59.000Z

228

Counterpulse railgun energy recovery circuit  

SciTech Connect

In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, a counterpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, Emanuel M. (Los Alamos, NM)

1986-01-01T23:59:59.000Z

229

Restoration and testing of an HTS fault current controller  

Science Conference Proceedings (OSTI)

A three-phase, 1200 A, 12.5 kV fault current controller using three HTS 4 mH coils, was built by industry and tested in 1999 at the Center Substation of Southern California Edison in Norwalk, CA. During the testing, it appeared that each of the three single-phase units had experienced a voltage breakdown, one externally and two internally. Los Alamos National Laboratory (LANL) was asked by DOE to restore the operation of the fault current controller provided the HTS coils had not been damaged during the initial substation tests. When the internally-failed coil vacuum vessels were opened it became evident that in these two vessels, a flashover had occurred at the high voltage bus section leading to the terminals of the superconducting coil. An investigation into the failure mechanism resulted in six possible causes for the flashover. Based on these causes, the high voltage bus was completely redesigned. Single-phase tests were successfully performed on the modified unit at a 13.7 kV LANL substation. This paper presents the postulated voltage flashover failure mechanisms, the new high voltage bus design which mitigates the failure mechanisms, the sequence of tests used to validate the new design, and finally, the results of variable load and short-circuit tests with the single-phase unit operating on the LANL 13.7 kV substation.

Waynert, J. A. (Joseph A.); Boenig, H. (Heinrich E.); Mielke, C. H. (Charles H.); Willis, J. O. (Jeffrey O.); Burley, B. L. (Burt L.)

2002-01-01T23:59:59.000Z

230

Multi-level logic minimization through fault dictionary analysis  

E-Print Network (OSTI)

This thesis presents the results of the study of a new ics. algorithm for multi-level logic minimization. This study is based upon the premises that an investable node is a redundant node and that nodes that do not demonstrably cause conflicting behavior at primary outputs may be compatible. Using fault simulation data, compatible nodes are identified and merged. While offering some improvement, this technique by itself leaves many potential reductions undiscovered. As has been noted in (1), adding wires may allow more gated to be eliminated. Using similar fault data to those used to identify compatible bates, implied gate functions are identified and injected. The addition of these new implicant functions creates more compatible pairs, which in some cases can then be eliminated. Data gathered using these techniques show that matrix analysis is a powerful tool that produces minimization results in selected benchmark circuits superior to any previously published academic work. The algorithm developed in this study, Texas Aggies Logic Optimizing Netlister (TALON), is shown to be competitive with, and complimentary to, other methodologies. TALON can be used by itself to reduce the size of a logic network, or it can be used as a preprocessor or postprocessor for other tools, giving superior results to those obtained by any of them working independently.

Mehler, Ronald W

1998-01-01T23:59:59.000Z

231

Electrical circuit for data reduction  

DOE Patents (OSTI)

This invention is comprised of an electrical circuit for determining characteristic voltages, such as maximum, minimum, average and root mean squared voltages, of a time-varying electrical signal. The circuit comprises a positive and a negative peak detector that feed the positive and negative voltage peaks detected in each of a series of time intervals into a solid-state multiplexer controlled by a process controller. The time intervals are generated by the process controller in combination with a clocking, circuit. The multiplexer applies the positive and negative peak voltages to a set of four capacitors, apply the positive peak to one capacitor during one interval and then the negative peak to that capacitor in a subsequent interval so that each capacitor is alternatingly accumulating a positive peak then a negative peak to obviate the need for resetting each capacitor. After the positive peak voltage is applied to one capacitor, the connection is switched during the next interval for reading the negative peak voltage, then switched again for applying, a negative peak voltage, then switched once more for reading the negative peak voltage, the multiplexer serving, as a solid state commutator for switching the electrical connection. Alternatively, peak maximum and minimum voltage detectors may be replaced with circuitry designed to obtain the additional characteristic voltages desired in each interval.

Kronberg, J.W.

1991-12-31T23:59:59.000Z

232

Electrical grounding prong socket  

SciTech Connect

The invention is a socket for a grounding prong used in a three prong electrical plug and a receptacle for the three prong plug. The socket being sufficiently spacious to prevent the socket from significantly stretching when a larger, U-shaped grounding prong is inserted into the socket, and having a ridge to allow a snug fit when a smaller tubular shape grounding prong is inserted into the socket.

Leong, Robert (Dublin, CA)

1991-01-01T23:59:59.000Z

233

Internal structure of the Kern Canyon Fault, California: a deeply exhumed strike-slip fault  

E-Print Network (OSTI)

Deformation and mineral alteration adjacent to a 2 km long segment of the Kern Canyon fault near Lake Isabella, California are studied to characterize the internal structure of the fault zone and to understand the development of fault structure and constitution and the mechanical and chemical processes responsible for them. The 140 km long Kern Canyon fault (KCF) is a fault of 15 km right-lateral separation exhumed from seismogenic depth that cuts batholithic and metamorphic rocks of the southern Sierra Nevada. The fault consists of at least three distinct phases: an early phase of lower-greenschist-grade ductile shear with an S-C' phyllonite, a subsequent, dominant phase of brittle faulting characterized by a through-going zone of cataclastic rock, and a late stage of minor faulting along discontinuous, thin, hematitic gouge zones. The S-C' fabric and subsidiary fault-slip data indicate that both the phyllonitic and cataclastic zones are approximately vertical and strike-slip; slip lineations within the hematitic gouge suggest oblique-slip. The phyllonite zone trends N20-40E and accommodated ~175 m of separation. The cataclastic zone cuts the phyllonite, trends N21E, and consists of foliated and non-foliated cataclasites; it accommodates the majority of displacement along the fault. Abundant veins and fluid-assisted alteration in the rock surrounding the fault zone attest to the presence of fluids of evolving chemistry during both ductile and brittle faulting. Mass balance calculations indicate quartz loss during phyllonite faulting and imply that the fault system was open and experienced a negative change in volume during phyllonite faulting. Mesoscale and microscale fracture intensities decrease with log distance from the foliated cataclasites and approach a relatively low level at approximately 500 m. The internal structure of the Kern Canyon fault is similar to other large displacement faults in that it consists of a broad zone of fractured and altered rock and a narrow zone of intense cataclasis.

Neal, Leslie Ann

2002-01-01T23:59:59.000Z

234

Predaceous Ground Beetles  

E-Print Network (OSTI)

Predaceous ground beetles can be a nuisance to homeowners, especially when they are numerous. This publication describes the beetles and discusses ways to prevent and treat them.

Sansone, Chris; Minzenmayer, Rick

2003-06-30T23:59:59.000Z

235

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 3, is a users manual and an installation and validation manual for the computer program SGSYS (Substation Grounding SYStem Analysis Program). This program analyzes the substation ground field given the total electric current injected into the ground field and the design of the grounding system. Standard outputs of the program are (1) total ground resistance, (2) step voltage, (3) touch voltage, (4) voltages on a grid of points, (5) voltage profile along straight lines, (6) transfer voltages, (7) ground potential rise, (8) body currents, (9) step voltage profile along straight lines, and (10) touch voltage profile along straight lines. This program can be utilized in an interactive or batch mode. In the interactive mode, the user defines the grounding system geometry, soil parameters, and output requests interactively, with the use of a user friendly conversational program. The users manual describes data requirements and data preparation procedures. An appendix provides forms which facilitate data collection procedures. The installation and validation manual describes the computer files which make up the program SGSYS and provides a test case for validation purposes.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

236

Method of determining the open circuit voltage of a battery in a closed circuit  

SciTech Connect

The open circuit voltage of a battery which is connected in a closed circuit is determined without breaking the circuit or causing voltage upsets therein. The closed circuit voltage across the battery and the current flowing through it are determined under normal load and then a fractional change is made in the load and the new current and voltage values determined. The open circuit voltage is then calculated, according to known principles, from the two sets of values.

Brown, William E. (Walnut Creek, CA)

1980-01-01T23:59:59.000Z

237

Fault Current Contribution from Single-Phase PV Inverters  

DOE Green Energy (OSTI)

A significant increase in photovoltaic (PV) system installations is expected to come on line in the near future and as the penetration level of PV increases, the effect of PV may no longer be considered minimal. One of the most important attributions of additional PV is what effect this may have on protection systems. Protection engineers design protection systems to safely eliminate faults from the electric power system. One of the new technologies recently introduced into the electric power system are distributed energy resources (DER). Currently, inverter-based DER contributes very little to the power balance on all but a few utility distribution systems. As DER become prevalent in the distribution system, equipment rating capability and coordination of protection systems merit a closer investigation. A collaborative research effort between the National Renewable Energy Laboratory (NREL) and Southern California Edison (SCE) involved laboratory short-circuit testing single-phase (240 VAC) residential type (between 1.5 and 7kW) inverters. This paper will reveal test results obtained from these short-circuit tests.

Keller, J.; Kroposki, B.; Bravo, R.; Robles, S.

2011-01-01T23:59:59.000Z

238

Apex or Salient of Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Apex or Salient of Normal Fault Apex or Salient of Normal Fault Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Apex or Salient of Normal Fault Dictionary.png Apex or Salient of Normal Fault: Normal faults may intersect in the subsurface to form a fault apex or salient. Apices or salients of normal faults account for 3% of structural controls in the Great Basin. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal systems: Major Normal Fault Termination of a Major Normal Fault Stepover or Relay Ramp in Normal Fault Zones Apex or Salient of Normal Fault Fault Intersection Accommodation Zone Displacement Transfer Zone Pull-Apart in Strike-Slip Fault Zone Intrusion Margins and Associated Fractures Stratigraphic Boundaries

239

Fault Current Management Guidebook--Updated  

Science Conference Proceedings (OSTI)

Due to increased load demands and reduced incentives to build new transmission, energy companies are increasing power flows on existing transmission assets, which will increase fault current levels throughout the power system. Also, new generation sources to be added at the transmission and distribution network will increase power flows and, consequently, fault current levels. Under increased power flow conditions on existing assets, managing fault currents is crucial for avoiding damage to equipment as ...

2006-11-28T23:59:59.000Z

240

Fault Tree Based Diagnostics Using Fuzzy Logic  

Science Conference Proceedings (OSTI)

Fuzzy set theory is investigated as a tool for the diagnostics of systems described by means of a fault tree. The objective is to diagnose component failures from the observation of fuzzy symptoms using the information contained in a fault tree. A two-step ... Keywords: causal reasoning, component failures, failure analysis, failure modes, fault tree based diagnostics, fuzzy logic, fuzzy symptoms, minimal cut-sets, triggered gates, two-step procedure

P. Gmytrasiewicz; J. A. Hassberger; J. C. Lee

1990-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radio nuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components.

McQuaid, James H. (Livermore, CA); Lavietes, Anthony D. (Hayward, CA)

1998-05-29T23:59:59.000Z

242

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector is disclosed. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radionuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components. 9 figs.

McQuaid, J.H.; Lavietes, A.D.

1998-05-26T23:59:59.000Z

243

History of Residential Grounding  

Science Conference Proceedings (OSTI)

This report describes the development of residential electrical service grounding practices in the United States. The report focuses on the history of the National Electrical Code (NEC), which prescribes standards for wiring practices in residences, including grounding of the building electrical service.

2002-09-19T23:59:59.000Z

244

Ways of grounding imagination  

Science Conference Proceedings (OSTI)

This paper discusses and evaluates use of different participatory design methods in relation to addressing the challenge of grounding imagination. It presents reflections on the use of three participatory design methods, deployed in the WorkSpace project: ... Keywords: PD methods, analytical triangulation, bricolage, future laboratory, grounding imagination, in-situ prototyping experiments

Monika Büscher; Mette Agger Eriksen; Jannie Friis Kristensen; Preben Holst Mogensen

2004-07-01T23:59:59.000Z

245

Adaptable Voltage Scan Testing of Charge-Sharing Faults for Domino Circuits  

Science Conference Proceedings (OSTI)

Because domino logic design offers smaller area and higher speed than complementary CMOS design, it has been very popularly used to design high-performance processors. However, domino logic suffers from several design problems and one of the most notable ...

Ching-Hwa Cheng

2002-11-01T23:59:59.000Z

246

Wind Power Plant Short Circuit Current Contribution for Different Fault and Wind Turbine Topologies: Preprint  

SciTech Connect

This paper presents simulation results for SC current contribution for different types of WTGs obtained through transient and steady-state computer simulation software.

Gevorgian, V.; Muljadi, E.

2010-10-01T23:59:59.000Z

247

Ground Motion Workshop  

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

2nd Advanced ICFA Beam Dynamics Workshop 2nd Advanced ICFA Beam Dynamics Workshop on Ground Motion in Future Accelerators November 6 - 9, 2000 SLAC Coordinators: Andrei Seryi & Tor Raubenheimer Proceedings Updated June 26, 2001 Agenda and Presentations Workshop photos Summaries Useful links Poster Goals Introduction to the problems Structure Registration Registered participants Committees Location, Accommodations and Travel Workshop on Ground Motion in Future Accelerators A workshop was held at SLAC that was devoted to ground motion and its effects on future accelerators. Ground motion and vibration can be a limiting effect in synchrotron light sources, hadron circular colliders, and electron/positron linear colliders. Over the last several years, there has been significant progress in the understanding of the ground motion and its effects, however, there are

248

Crossing Active Faults on the Sakhalin II Onshore Pipeline Route: Pipeline Design and Risk Analysis  

SciTech Connect

Twin oil (20 and 24 inch) and gas (20 and 48 inch) pipeline systems stretching 800 km are being constructed to connect offshore hydrocarbon deposits from the Sakhalin II concession in the North to an LNG plant and oil export terminal in the South of Sakhalin island. The onshore pipeline route follows a regional fault zone and crosses individual active faults at 19 locations. Sakhalin Energy, Design and Construction companies took significant care to ensure the integrity of the pipelines, should large seismic induced ground movements occur during the Operational life of the facilities. Complex investigations including the identification of the active faults, their precise location, their particular displacement values and assessment of the fault kinematics were carried out to provide input data for unique design solutions. Lateral and reverse offset displacements of 5.5 and 4.5 m respectively were determined as the single-event values for the design level earthquake (DLE) - the 1000-year return period event. Within the constraints of a pipeline route largely fixed, the underground pipeline fault crossing design was developed to define the optimum routing which would minimize stresses and strain using linepipe materials which had been ordered prior to the completion of detailed design, and to specify requirements for pipe trenching shape, materials, drainage system, etc. Detailed Design was performed with due regard to actual topography and to avoid the possibility of the trenches freezing in winter, the implementation of specific drainage solutions and thermal protection measures.

Mattiozzi, Pierpaolo [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano (Italy); Strom, Alexander [Institute of Geospheres Dynamics, Leninskiy Avenue, 38, Building 1, 119334, Moscow (Russian Federation)

2008-07-08T23:59:59.000Z

249

Crossing Active Faults on the Sakhalin II Onshore Pipeline Route: Analysis Methodology and Basic Design  

Science Conference Proceedings (OSTI)

Twin oil (20 and 24 inch) and gas (20 and 48 inch) pipeline systems stretching 800 km are being constructed to connect offshore hydrocarbon deposits from the Sakhalin II concession in the North to an LNG plant and oil export terminal in the South of Sakhalin island. The onshore pipeline route follows a regional fault zone and crosses individual active faults at 19 locations. Sakhalin Energy, Design and Construction companies took significant care to ensure the integrity of the pipelines, should large seismic induced ground movements occur during the Operational life of the facilities. Complex investigations including the identification of the active faults, their precise location, their particular displacement values and assessment of the fault kinematics were carried out to provide input data for unique design solutions. Lateral and reverse offset displacements of 5.5 and 4.5 m respectively were determined as the single-event values for the design level earthquake (DLE)--the 1000-year return period event. Within the constraints of a pipeline route largely fixed, the underground pipeline fault crossing design was developed to define the optimum routing which would minimize stresses and strain using linepipe materials which had been ordered prior to the completion of detailed design, and to specify requirements for pipe trenching shape, materials, drainage system, etc. This Paper describes the steps followed to formulate the concept of the special trenches and the analytical characteristics of the Model.

Vitali, Luigino [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano, Luigino (Italy); Mattiozzi, Pierpaolo [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano (Italy)

2008-07-08T23:59:59.000Z

250

Distribution Fault Location Support Tools, Algorithms, and Implementation Approaches  

Science Conference Proceedings (OSTI)

Distribution grid modernization applications such as fault location and automatic sectionalizing require an accurate assessment of fault current. More-accurate prediction of fault locations will shorten the fault investigation (patrol) time, which in turn can reduce the total restoration time and duration of the outage experienced by the customer. This EPRI technical update report presents information on fault location applications, enumerates different methods used to detect the location of faults, ...

2013-08-14T23:59:59.000Z

251

ARMor: fully verified software fault isolation  

Science Conference Proceedings (OSTI)

We have designed and implemented ARMor, a system that uses software fault isolation (SFI) to sandbox application code running on small embedded processors. Sandboxing can be used to protect components such as the RTOS and critical control loops from ... Keywords: arm executables, automated theorem proving, program logic, software fault isolation

Lu Zhao; Guodong Li; Bjorn De Sutter; John Regehr

2011-10-01T23:59:59.000Z

252

A switch level fault simulation environment  

Science Conference Proceedings (OSTI)

This paper presents a fault simulation environment which accepts pure switch level or mixed switch/RT level descriptions of the design under test. Switch level fault injection strategies for the stuck-at, transition and logic bridge models are presented. ...

V. Krishnaswamy; J. Casas; T. Tetzlaff

2000-06-01T23:59:59.000Z

253

Representing parameterised fault trees using Bayesian networks  

Science Conference Proceedings (OSTI)

Fault trees are used to model how failures lead to hazards and so to estimate the frequencies of the identified hazards of a system. Large systems, such as a rail network, do not give rise to endless different hazards. Rather, similar hazards arise repeatedly ... Keywords: Bayesian network, fault tree, risk analysis

William Marsh; George Bearfield

2007-09-01T23:59:59.000Z

254

Gas Turbine Fault Diagnosis using Random Forests  

Science Conference Proceedings (OSTI)

In the present paper, Random Forests are used in a critical and at the same time non trivial problem concerning the diagnosis of Gas Turbine blading faults, portraying promising results. Random forests-based fault diagnosis is treated as a Pattern Recognition ...

Manolis Maragoudakis; Euripides Loukis; Panayotis-Prodromos Pantelides

2008-06-01T23:59:59.000Z

255

BASE: Using abstraction to improve fault tolerance  

Science Conference Proceedings (OSTI)

Software errors are a major cause of outages and they are increasingly exploited in malicious attacks. Byzantine fault tolerance allows replicated systems to mask some software errors but it is expensive to deploy. This paper describes a replication ... Keywords: Byzantine fault tolerance, N-version programming, asynchronous systems, proactive recovery, state machine replication

Miguel Castro; Rodrigo Rodrigues; Barbara Liskov

2003-08-01T23:59:59.000Z

256

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS  

E-Print Network (OSTI)

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent

Povinelli, Richard J.

257

Multiplexer and time duration measuring circuit  

DOE Patents (OSTI)

A multiplexer device is provided for multiplexing data in the form of randomly developed, variable width pulses from a plurality of pulse sources to a master storage. The device includes a first multiplexer unit which includes a plurality of input circuits each coupled to one of the pulse sources, with all input circuits being disabled when one input circuit receives an input pulse so that only one input pulse is multiplexed by the multiplexer unit at any one time.

Gray, Jr., James (Downers Grove, IL)

1980-01-01T23:59:59.000Z

258

Monitoring transients in low inductance circuits  

DOE Patents (OSTI)

The instant invention relates to methods of and apparatus for monitoring transients in low inductance circuits and to a probe utilized to practice said method and apparatus. More particularly, the instant invention relates to methods of and apparatus for monitoring low inductance circuits, wherein the low inductance circuits include a pair of flat cable transmission lines. The instant invention is further directed to a probe for use in monitoring pairs of flat cable transmission lines.

Guilford, R.P.; Rosborough, J.R.

1985-10-21T23:59:59.000Z

259

Green Circuits: Distribution Efficiency Case Studies  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) Green Circuits project was a collaborative effort of 22 utilities. The main goal of the project was to evaluate ways to improve distribution efficiency. Modeling, economic evaluations, and field trials formed the core of the research effort. To evaluate efficiency improvements, 66 circuit case studies were modeled and fine-tuned, based on field data. Field trials of voltage optimization were implemented on nine circuits. Detailed advanced metering infrastructu...

2011-10-14T23:59:59.000Z

260

Asynchronous logic circuits and sheaf obstructions  

E-Print Network (OSTI)

This article exhibits a particular encoding of logic circuits into a sheaf formalism. The central result of this article is that there exists strictly more information available to a circuit designer in this setting than exists in static truth tables, but less than exists in event-level simulation. This information is related to the timing behavior of the logic circuits, and thereby provides a ``bridge'' between static logic analysis and detailed simulation.

Robinson, Michael

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Sequential Circuit Testing: From DFT to SFT  

Science Conference Proceedings (OSTI)

Sequential circuit testing is an active research area due to its applicability, its practicality, and its complexity. This paper gives an overview of the sequential automatic test pattern generation approaches and the classical and more recent design-for-testability ... Keywords: logic testing, sequential circuit testing, DFT techniques, automatic test pattern generation, design-for-testability methods, synthesis-for-testability, SFT techniques, large sequential circuits, ATPG

R. M. Chou; K. K. Saluja

1997-01-01T23:59:59.000Z

262

Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems  

E-Print Network (OSTI)

in Fault Diagnostics for HVAC Systems Massieh Najafi 1 ,tools for determining HVAC diagnostics, methods todetect faults in HVAC systems are still generally

Najafi, Massieh

2010-01-01T23:59:59.000Z

263

Modeling and simulation of HVAC faults in EnergyPlus  

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

simulation of HVAC faults in EnergyPlus Title Modeling and simulation of HVAC faults in EnergyPlus Publication Type Conference Paper Refereed Designation Refereed Year of...

264

Modeling and Measurement Constraints in Fault Diagnostics for...  

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

Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Title Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Publication Type Journal...

265

CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems...  

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

CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems Current systems software components for large-scale...

266

CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems...  

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

CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems Title CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems Publication Type Conference Paper Year of...

267

Enhancing Open Circuit Voltage by Combining Thermoelectric ...  

Science Conference Proceedings (OSTI)

Enhancing Open Circuit Voltage by Combining Thermoelectric Materials and Dye -Sensitized Solar Cell in Series · Estimation of Compressive Strength of High ...

268

Optimising Circuit Design for Gravity Gold Recovery  

Science Conference Proceedings (OSTI)

Abstract Scope, To determine the optimal circuit configuration for gravity gold recovery ... Energy Management Planning, Following the ISO 50001 Draft Standard.

269

Circuit breaker monitoring application using wireless communication  

E-Print Network (OSTI)

Circuit breakers are used in the power system to break or make current flow through power apparatus. Reliable operation of circuit breakers is critical to the well- being of the power system and can be achieved by regular inspection and maintenance. A low-cost automated circuit breaker monitoring system is developed to monitor circuit breaker control signals. An interface is designed on top of which different local and system-wide applications can be developed which utilize the data recorded by the system. Some of the possible applications are proposed. Lab and field evaluation of the designed system is performed and results are presented.

Ved, Nitin

2005-12-01T23:59:59.000Z

270

Automated Fault Location In Smart Distribution Systems  

E-Print Network (OSTI)

Fault location in distribution systems is a critical component of outage management and service restoration, which directly impacts feeder reliability and quality of the electricity supply. Improving fault location methods supports the Department of Energy (DOE) “Grid 2030” initiatives for grid modernization by improving reliability indices of the network. Improving customer average interruption duration index (CAIDI) and system average interruption duration index (SAIDI) are direct advantages of utilizing a suitable fault location method. As distribution systems are gradually evolving into smart distribution systems, application of more accurate fault location methods based on gathered data from various Intelligent Electronic Devices (IEDs) installed along the feeders is quite feasible. How this may be done and what is the needed methodology to come to such solution is raised and then systematically answered. To reach this goal, the following tasks are carried out: 1) Existing fault location methods in distribution systems are surveyed and their strength and caveats are studied. 2) Characteristics of IEDs in distribution systems are studied and their impacts on fault location method selection and implementation are detailed. 3) A systematic approach for selecting optimal fault location method is proposed and implemented to pinpoint the most promising algorithms for a given set of application requirements. 4) An enhanced fault location method based on voltage sag data gathered from IEDs along the feeder is developed. The method solves the problem of multiple fault location estimations and produces more robust results. 5) An optimal IED placement approach for the enhanced fault location method is developed and practical considerations for its implementation are detailed.

Lotfifard, Saeed

2011-08-01T23:59:59.000Z

271

Substation Grounding Grids  

Science Conference Proceedings (OSTI)

This report is an account of research performed by the Electric Power Research Institute (EPRI) in 2011 on the subject of degradation of buried grounding grids in electric power substations. Substation ground grids are usually made of copper conductors, which are placed below grade and are joined together and to the above-grade structures with various types of connectors. While above-grade connections are visible and may be inspected, below-grade connections are not visible or readily accessible for insp...

2011-12-22T23:59:59.000Z

272

Ground Magnetics At Coso Geothermal Area (1984) | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Ground Magnetics At Coso Geothermal Area (1984) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Magnetics At Coso Geothermal Area (1984) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Ground Magnetics Activity Date 1984 Usefulness useful DOE-funding Unknown Notes The magnetic intensity contours match general geologic patterns in varying rock types. Hydrothermally altered rocks along intersecting fault zones show up as strong magnetic lows that form a triangular-shaped area. This area is centered in an area of highest heat flow and is a site of

273

Sequential power-up circuit  

DOE Patents (OSTI)

A sequential power-up circuit for starting several electrical load elements in series to avoid excessive current surge, comprising a voltage ramp generator and a set of voltage comparators, each comparator having a different reference voltage and interfacing with a switch that is capable of turning on one of the load elements. As the voltage rises, it passes the reference voltages one at a time and causes the switch corresponding to that voltage to turn on its load element. The ramp is turned on and off by a single switch or by a logic-level electrical signal. The ramp rate for turning on the load element is relatively slow and the rate for turning the elements off is relatively fast. Optionally, the duration of each interval of time between the turning on of the load elements is programmable. 2 figs.

Kronberg, J.W.

1992-06-02T23:59:59.000Z

274

Sequential power-up circuit  

DOE Patents (OSTI)

A sequential power-up circuit for starting several electrical load elements in series to avoid excessive current surge, comprising a voltage ramp generator and a set of voltage comparators, each comparator having a different reference voltage and interfacing with a switch that is capable of turning on one of the load elements. As the voltage rises, it passes the reference voltages one at a time and causes the switch corresponding to that voltage to turn on its load element. The ramp is turned on and off by a single switch or by a logic-level electrical signal. The ramp rate for turning on the load element is relatively slow and the rate for turning the elements off is relatively fast. Optionally, the duration of each interval of time between the turning on of the load elements is programmable.

Kronberg, James W. (108 Independent Blvd., Aiken, SC 29801)

1992-01-01T23:59:59.000Z

275

Quantum Interference in Plasmonic Circuits  

E-Print Network (OSTI)

Surface plasmon polaritons (plasmons) are a combination of light and a collective oscillation of the free electron plasma at metal-dielectric interfaces. This interaction allows sub-wavelength confinement of light, beyond the diffraction limit inherent to dielectric structures. The resulting electromagnetic fields are more intense and the strength of optical interactions between metallic structures and light-sources or detectors can be increased. Plasmons maintain non-classical photon statistics and preserve entanglement on plasmon-assisted transmission through thin, patterned metallic films or weakly confining waveguides. For quantum applications it is essential that plasmons behave as indistinguishable quantum particles. Here we report on a quantum interference experiment in a nanoscale plasmonic circuit consisting of an on-chip plasmon beam splitter with integrated superconducting single-photon detectors to allow efficient single plasmon detection. We demonstrate quantum mechanical interaction between pair...

Heeres, Reinier W; Zwiller, Valery

2013-01-01T23:59:59.000Z

276

Quantum transducer in circuit optomechanics  

E-Print Network (OSTI)

Mechanical resonators are macroscopic quantum objects with great potential. They couple to many different quantum systems such as spins, optical photons, cold atoms, and Bose Einstein condensates. It is however difficult to measure and manipulate the phonon state due to the tiny motion in the quantum regime. On the other hand, microwave resonators are powerful quantum devices since arbitrary photon state can be synthesized and measured with a quantum tomography. We show that a linear coupling, strong and controlled with a gate voltage, between the mechanical and the microwave resonators enables to create quantum phonon states, manipulate hybrid entanglement between phonons and photons and generate entanglement between two mechanical oscillators. In circuit quantum optomechanics, the mechanical resonator acts as a quantum transducer between an auxiliary quantum system and the microwave resonator, which is used as a quantum bus.

Didier, Nicolas; Blanter, Yaroslav M; Fazio, Rosario

2012-01-01T23:59:59.000Z

277

Fault diagnosis using substation computer  

SciTech Connect

A number of substation integrated control and protection systems (ICPS) are being developed around the world, where the protective relaying, control, and monitoring functions of a substation are implemented using microprocessors. In this design, conventional relays and control devices are replaced by clusters of microprocessors, interconnected by multiplexed digital communication channels using fibre optic, twisted wire pairs or coaxial cables. The ICPS incorporates enhanced functions of value to the utility and leads to further advancement of the automation of transmission substations. This paper presents an automated method of fault diagnosis which can be incorporated in the station computer of an integrated control and protection system. The effectiveness of this method is demonstrated using a transmission-level substation as an example.

Jeyasurya, B. (Indian Inst. of Tech., Bombay (India)); Venkata, S.S. (Washington Univ., Seattle, WA (USA). Dept. of Electrical Engineering); Vadari, S.V. (ESCA Corp., Bellevue, WA (USA)); Postforoosh, J. (T and D. Protection Group, Puget Sound Power and Light, Bellevue, WA (US))

1990-04-01T23:59:59.000Z

278

Ground grid design changes due to potential rise limits outside substations  

SciTech Connect

To ensure safe grounding for personnel and to provide for correct operation of relays, several design factors are critical to assessing the adequacy of a station ground grid design. These difficult to alter parameters are soil resistivity, clearing times for single line to ground station faults, size and location of the substation, and the magnitude of the single line to ground fault current. These are the critical parameters for the grounding system, leaving the designer with the grid area, grid geometry, wire size, surface material, number of ground rods, and burial depth as the tools for reducing step and touch potentials to adequate levels. Grounding practices for substations are based on maintaining step and touch potentials below the limits described in IEEE-80. Guide for AC Substation Grounding. Recently, requirements to limit step and touch potentials outside the substation perimeter were proposed by particular government agencies in Commonwealth Edison's service territory. This limit imposes design changes that would increase construction costs and prevent locating substation at existing sites. This paper compares the design changes needed to meet lower limits with a standard installation designed according to the IEEE-80 guide.

Lodwig, S.G. (Commonwealth Edison Co., Chicago, IL (United States))

1992-01-01T23:59:59.000Z

279

Post-Construction Fires Prior to September 11, 2001  

Science Conference Proceedings (OSTI)

... Trade Center Disaster: The Con Ed Substation in World ... fire was a “short circuit, ground fault ... Significant Fire Incident Date Fire Location # Sprinklers ...

280

Quantifying Dynamic Stability of Genetic Memory Circuits  

Science Conference Proceedings (OSTI)

Bistability/Multistability has been found in many biological systems including genetic memory circuits. Proper characterization of system stability helps to understand biological functions and has potential applications in fields such as synthetic biology. ... Keywords: Dynamic stability, genetic memory, gene circuit, dynamic noise margin.

Yong Zhang; Peng Li; Garng Huang

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

A Mixed Heuristic for Circuit Partitioning  

Science Conference Proceedings (OSTI)

As general-purpose parallel computers are increasingly being used to speed up different VLSI applications, the development of parallel algorithms for circuit testing, logic minimization and simulation, HDL-based synthesis, etc. is currently a field of ... Keywords: Tabu Search, circuit partitioning, optimisation, parallel test pattern generation, simulated annealing

C. Gil; J. Ortega; M. G. Montoya; R. Baños

2002-12-01T23:59:59.000Z

282

Multistable Circuits for Analog Memories Implementation  

Science Conference Proceedings (OSTI)

In this work two multistable circuits suitable for analog memories implementation will be presented. These circuits have been used to implement completely asynchronous analog memories, one type based on a flash converter and thus having a linear complexity ... Keywords: analog memories, asynchronous converters, successive approximations

Giorgio Biagetti; Massimo Conti; Simone Orcioni

2004-04-01T23:59:59.000Z

283

Experimentally driven verification of synthetic biological circuits  

Science Conference Proceedings (OSTI)

We present a framework that allows us to construct and formally analyze the behavior of synthetic gene circuits from specifications in a high level language used in describing electronic circuits. Our back-end synthesis tool automatically generates genetic-regulatory ...

Boyan Yordanov; Evan Appleton; Rishi Ganguly; Ebru Aydin Gol; Swati Banerjee Carr; Swapnil Bhatia; Traci Haddock; Calin Belta; Douglas Densmore

2012-03-01T23:59:59.000Z

284

High performance low power CMOS dynamic logic for arithmetic circuits  

Science Conference Proceedings (OSTI)

This paper presents the design of high performance and low power arithmetic circuits using a new CMOS dynamic logic family, and analyzes its sensitivity against technology parameters for practical applications. The proposed dynamic logic family allows ... Keywords: CMOS digital integrated circuits, CMOS logic circuits, Dynamic logic, High speed arithmetic circuits, Low power arithmetic circuits

Victor Navarro-Botello; Juan A. Montiel-Nelson; Saeid Nooshabadi

2007-04-01T23:59:59.000Z

285

Reusable vibration resistant integrated circuit mounting socket  

DOE Patents (OSTI)

This invention discloses a novel form of socket for integrated circuits to be mounted on printed circuit boards. The socket uses a novel contact which is fabricated out of a bimetallic strip with a shape which makes the end of the strip move laterally as temperature changes. The end of the strip forms a barb which digs into an integrated circuit lead at normal temperatures and holds it firmly in the contact, preventing loosening and open circuits from vibration. By cooling the contact containing the bimetallic strip the barb end can be made to release so that the integrated circuit lead can be removed from the socket without damage either to the lead or to the socket components.

Evans, Craig N. (Irwin, PA)

1995-01-01T23:59:59.000Z

286

Cooperative application/OS DRAM fault recovery.  

Science Conference Proceedings (OSTI)

Exascale systems will present considerable fault-tolerance challenges to applications and system software. These systems are expected to suffer several hard and soft errors per day. Unfortunately, many fault-tolerance methods in use, such as rollback recovery, are unsuitable for many expected errors, for example DRAM failures. As a result, applications will need to address these resilience challenges to more effectively utilize future systems. In this paper, we describe work on a cross-layer application/OS framework to handle uncorrected memory errors. We illustrate the use of this framework through its integration with a new fault-tolerant iterative solver within the Trilinos library, and present initial convergence results.

Ferreira, Kurt Brian; Bridges, Patrick G. (University of New Mexico, Albuquerque, NM); Heroux, Michael Allen; Hoemmen, Mark; Brightwell, Ronald Brian

2012-05-01T23:59:59.000Z

287

Neural Fault Diagnosis and Fuzzy Fault Control for a Complex Dynamic System  

E-Print Network (OSTI)

Fault diagnosis has become an issue of primary importance in modern process automation as it provides the prerequisites for the task of fault detection. The ability to detect the faults is essential to improve reliability and security of a complex control system. Parameter estimation methods, state observation schemes, statistical likelihood ratio tests, rule-based expert system reasoning, pattern recognition techniques, and artificial neural network approaches are the most common methodologies developed actively during recent years. In this paper, we describe a completed feasibility study demonstrating the merit of employing pattern recognition and an artificial neural network for fault diagnosis through back propagation learning algorithm and making the use of fuzzy approximate reasoning for fault control via parameter changes in a dynamic system. As a test case, a complex magnetic levitation vehicle (MLV) system is studied. Analytical fault symptoms are obtained by system dynamics m...

Ching-yu Tyan; Paul P. Wang; Dennis R. Bahler

1995-01-01T23:59:59.000Z

288

Ground Gravity Survey At Long Valley Caldera Area (Laney, 2005) | Open  

Open Energy Info (EERE)

Ground Gravity Survey At Long Valley Caldera Area Ground Gravity Survey At Long Valley Caldera Area (Laney, 2005) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Ground Gravity Survey Activity Date Usefulness not indicated DOE-funding Unknown Notes Localized Strain as a Discriminator of Hidden Geothermal Systems, Vasco and Foxall, 2005. Recent work has focused on (1) collaborating with Alessandro Ferretti to use Permanent Scatterer (PS) InSAR data to infer strain at depth, (2) working with Lane Johnson to develop a dynamic faulting model, and (3) acquiring InSAR data for the region surrounding the Dixie Valley fault zone in collaboration with Dr. William Foxall of LLNL. The InSAR data have been processed and an initial interpretation of the results is ongoing. In particular, we have InSAR stacks for over twenty pairs of

289

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 5, is an applications guide of the three computer programs. SOMIP, SMECC, and SGSYS, for the purpose of designing a safe substation grounding system. The applications guide utilizes four example substation grounding systems for the purpose of illustrating the application of the programs, SOMIP, SMECC, and SGSYS. The examples are based on data provided by four contributing utilities, namely, Houston Lighting and Power Company, Southern Company Services, Puget Sound Power and Light Company, and Arizona Public Service Company. For the purpose of illustrating specific capabilities of the computer programs, the data have been modified. As a result, the final designs of the four systems do not necessarily represent actual grounding system designs by these utilities. The example system 1 is a 138 kV/35 kV distribution substation. The example system 2 is a medium size 230 kV/115 kV transmission substation. The third example system is a generation substation while the last is a large 525 kV/345 kV/230 kV transmission substation. The four examples cover most of the practical problems that a user may encounter in the design of substation grounding systems.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

290

Quantification of Priority-OR gates in temporal fault trees  

Science Conference Proceedings (OSTI)

Fault Tree Analysis has been used in reliability engineering for many decades and has seen various modifications to enable it to analyse fault trees with dynamic and temporal gates so it can incorporate sequential failure in its analysis. Pandora is ... Keywords: Markov chains, Monte Carlo, Pandora, dynamic fault trees, fault trees, safety

Ernest Edifor; Martin Walker; Neil Gordon

2012-09-01T23:59:59.000Z

291

Development of Hydrologic Characterization Technology of Fault Zones  

E-Print Network (OSTI)

pathways in the Monterey Formation, California: Americanalong faults in the Monterey Formation, coastal California.

Karasaki, Kenzi

2009-01-01T23:59:59.000Z

292

Online fault detection and tolerance for photovoltaic energy harvesting systems  

Science Conference Proceedings (OSTI)

Photovoltaic energy harvesting systems (PV systems) are subject to PV cell faults, which decrease the efficiency of PV systems and even shorten the PV system lifespan. Manual PV cell fault detection and elimination are expensive and nearly impossible ... Keywords: fault detection, fault tolerance, photovoltaic panel reconfiguration, photovoltaic system

Xue Lin; Yanzhi Wang; Di Zhu; Naehyuck Chang; Massoud Pedram

2012-11-01T23:59:59.000Z

293

Substation Ground Grid Impedance Measurement  

Science Conference Proceedings (OSTI)

Because safety impacts all segments of the electric power industry, the integrity and conformance to standards of substation grounding systems is of paramount importance. This report summarizes field demonstrations of commercially available meters for performance evaluation of large grounding systems, including the EPRI Ground Grid Evaluator (commercially known as the Smart Ground Multimeter or SGM).

2007-12-13T23:59:59.000Z

294

Different Factors Affecting Short Circuit Behavior of a Wind Power Plant  

SciTech Connect

A wind power plant consists of a large number of turbines interconnected by underground cable. A pad-mount transformer at each turbine steps up the voltage from generating voltage (690 V) to a medium voltage (34.5 kV). All turbines in the plant are connected to the substation transformer where the voltage is stepped up to the transmission level. An important aspect of wind power plant (WPP) impact studies is to evaluate the short-circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper investigates the short circuit behavior of a wind power plant for different types of faults. The impact of wind turbine types, the transformer configuration, and the reactive compensation capacitor will be investigated. The voltage response at different buses will be observed. Finally, the SC line currents will be presented along with its symmetrical components.

Muljadi, E.; Samaan, Nader A.; Gevorgian, Vahan; Li, Jun; Pasupulati, Subbaiah

2013-01-31T23:59:59.000Z

295

Different Factors Affecting Short Circuit Behavior of a Wind Power Plant  

SciTech Connect

A wind power plant consists of a large number of turbines interconnected by underground cable. A pad-mount transformer at each turbine steps up the voltage from generating voltage (690 V) to a medium voltage (34.5 kV). All turbines in the plant are connected to the substation transformer where the voltage is stepped up to the transmission level. An important aspect of wind power plant (WPP) impact studies is to evaluate the short-circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper investigates the short circuit behavior of a wind power plant for different types of faults. The impact of wind turbine types, the transformer configuration, and the reactive compensation capacitor will be investigated. The voltage response at different buses will be observed. Finally, the SC line currents will be presented along with its symmetrical components.

Muljadi, E.; Samaan, Nader A.; Gevorgian, Vahan; Li, Jun; Pasupulati, Subbaiah

2010-12-21T23:59:59.000Z

296

Fault intersections and hybrid transform faults in the southern Salton Trough geothermal area, Baja California, Mexico  

DOE Green Energy (OSTI)

Analysis of 55 wells drilled at the Cerro Prieto Geothermal Field and a suite of geological and geophysical studies throughout the southern Salton Trough from the Mexican-United States border to the Gulf of California clarify two concepts important to geothermal development: (1) increased natural convective fluid flow and better permeability should occur at intersecting faults both regionally and within a producing field, and (2) the Cerro Prieto and Imperial faults are best conceived of as hybrid types having features of both San Andreas style wrench faults and oceanic tranform faults.

Vonder Haar, S.; Puente Cruz, I.

1979-07-01T23:59:59.000Z

297

Fault Detection, Location, Isolation and Reconnection in ...  

A University of Colorado research team led by Jae-Do Park has developed a fault detection, location and isolation scheme for a low-voltage DC-bus microgrid system, ...

298

Fault tolerance for holonomic quantum computation  

E-Print Network (OSTI)

We review an approach to fault-tolerant holonomic quantum computation on stabilizer codes. We explain its workings as based on adiabatic dragging of the subsystem containing the logical information around suitable loops along which the information remains protected.

Ognyan Oreshkov; Todd A. Brun; Daniel A. Lidar

2013-12-01T23:59:59.000Z

299

Improved Smart Ground Multimeter  

Science Conference Proceedings (OSTI)

The Smart Ground Multimeter (SGM) underwent three major redesigns since its original development in the early 1980s. This report describes the latest redesign and provides useful tips on the assessment of measured data quality and on resolving measurement problems in the field.

2006-12-18T23:59:59.000Z

300

Substation grounding programs  

SciTech Connect

The five volume report comprises the user manual, installation, and validation manual and an applications guide for the SGA (Substation Grounding Analysis) software package. SGA consists of four computer programs: (1) SOMIP, (2) SMECC, (3) SGSYS, and (4) TGRND. The first three programs provide a comprehensive analysis tool for the design of substation grounding systems to meet safety standards. The fourth program, TGRND, provides a state of the art analysis tool for computing transient ground potential rise and ground system impedance. This part of the report, Volume 1, is a users manual and an installation and validation manual for the computer program SOMIP (SOil Measurement Interpretation Program). This program computes the best estimate of the parameters of a two layer soil model from usual soil resistivity measurements. Four pin or three pin soil measurements can be accommodated. In addition, it provides error bounds on the soil parameters for a given confidence level. The users manual describes data requirements and data preparation procedures. The installation and validation manual describes the computer files which make up the program SOMIP and provides two test cases for validation purposes. 4 refs.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). School of Electrical Engineering)

1992-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Overload protection circuit for output driver  

DOE Patents (OSTI)

A protection circuit for preventing excessive power dissipation in an output transistor whose conduction path is connected between a power terminal and an output terminal. The protection circuit includes means for sensing the application of a turn on signal to the output transistor and the voltage at the output terminal. When the turn on signal is maintained for a period of time greater than a given period without the voltage at the output terminal reaching a predetermined value, the protection circuit decreases the turn on signal to, and the current conduction through, the output transistor.

Stewart, Roger G. (Neshanic Station, NJ)

1982-05-11T23:59:59.000Z

302

Definition: Circuit Peak Load Management | Open Energy Information  

Open Energy Info (EERE)

Circuit Peak Load Management Jump to: navigation, search Dictionary.png Circuit Peak Load Management An application utilizing sensors, information processors, communications, and...

303

Novel techniques for fault location, voltage profile calculation and visualization of transients  

E-Print Network (OSTI)

This dissertation addresses three different problems in power systems. The first problem is related to the fault location in complex topologies such as three terminal circuits with series compensation and mutually coupled line sections and distribution networks with distributed generation. Novel methods are presented by using traveling wave approach and wavelet transformation technique to overcome the difficulties introduced by the discontinuities and integrated components such as Metal Oxide Varistor (MOV) protected series capacitors and distributed generation in complex topologies. Simulation results show good correlation between the actual and estimated fault locations for all the studied cases. The second problem concerns the calculation techniques of voltage profiles along transmission lines. A simple yet effective approach to accurately and rapidly obtain the voltage profile along a transmission line during fault transients is presented. The objective of the presented method is to eliminate the need to use wave equations and line parameters provided that an electromagnetic Transients Program (EMTP) type transients simulator is available for generating bus voltage transients for a given fault. This is accomplished by developing a time series model to estimate the voltage at an intermediate point along the transmission line. The model is formed for each intermediate point separately. Once the model is obtained it can be used to predict the transient voltage at that point along the line during any fault in the system. The approach can potentially be useful as a post processor to a transient simulator and can be used by developers of transient animations and movies for illustrating fault-initiated propagation of traveling waves in power systems. The third problem is the lack of powerful visualization and animation methods, which can help understanding the complex behavior of power systems during transients. The goal of this part of the dissertation is to develop new animation and visualization methods for power system electromagnetic transients for both educational and research purposes. Proposed approaches are implemented in different environments such as MATLAB and Microsoft Visual Studio to show the effectiveness of two and three-dimensional visualization of power system transients. The implementations of the proposed methods provide better understanding of the power systems during transient phenomena due to the faults or switchings.

Evrenosoglu, Cansin Yaman

2006-12-01T23:59:59.000Z

304

Fault-Tolerant Dissipative Preparation of Atomic Quantum Registers with Fermions  

E-Print Network (OSTI)

We propose a fault tolerant loading scheme to produce an array of fermions in an optical lattice of the high fidelity required for applications in quantum information processing and the modelling of strongly correlated systems. A cold reservoir of Fermions plays a dual role as a source of atoms to be loaded into the lattice via a Raman process and as a heat bath for sympathetic cooling of lattice atoms. Atoms are initially transferred into an excited motional state in each lattice site, and then decay to the motional ground state, creating particle-hole pairs in the reservoir. Atoms transferred into the ground motional level are no longer coupled back to the reservoir, and doubly occupied sites in the motional ground state are prevented by Pauli blocking. This scheme has strong conceptual connections with optical pumping, and can be extended to load high-fidelity patterns of atoms.

Griessner, A; Jaksch, D; Zoller, P

2005-01-01T23:59:59.000Z

305

Fault-Tolerant Dissipative Preparation of Atomic Quantum Registers with Fermions  

E-Print Network (OSTI)

We propose a fault tolerant loading scheme to produce an array of fermions in an optical lattice of the high fidelity required for applications in quantum information processing and the modelling of strongly correlated systems. A cold reservoir of Fermions plays a dual role as a source of atoms to be loaded into the lattice via a Raman process and as a heat bath for sympathetic cooling of lattice atoms. Atoms are initially transferred into an excited motional state in each lattice site, and then decay to the motional ground state, creating particle-hole pairs in the reservoir. Atoms transferred into the ground motional level are no longer coupled back to the reservoir, and doubly occupied sites in the motional ground state are prevented by Pauli blocking. This scheme has strong conceptual connections with optical pumping, and can be extended to load high-fidelity patterns of atoms.

A. Griessner; A. J. Daley; D. Jaksch; P. Zoller

2005-02-25T23:59:59.000Z

306

Generating Circuit Tests by Exploiting Designed Behavior  

E-Print Network (OSTI)

This thesis describes two programs for generating tests for digital circuits that exploit several kinds of expert knowledge not used by previous approaches. First, many test generation problems can be solved efficiently ...

Shirley, Mark Harper

1988-12-01T23:59:59.000Z

307

Low Power Oriented CMOS Circuit Optimization Protocol  

Science Conference Proceedings (OSTI)

Low power oriented circuit optimization consists in selecting the best alternative between gate sizing, buffer insertion and logic structure transformation, for satisfying a delay constraint at minimum area cost. In this paper we used a closed form model ...

A. Verle; X. Michel; N. Azemard; P. Maurine; D. Auvergne

2005-03-01T23:59:59.000Z

308

Energy Extraction for the LHC Superconducting Circuits  

E-Print Network (OSTI)

The superconducting magnets of the LHC will be powered in about 1700 electrical circuits. The energy stored in circuits, up to 1.3 GJ, can potentially cause severe damage of magnets, bus bars and current leads. In order to protect the superconducting elements after a resistive transition, the energy is dissipated into a dump resistor installed in series with the magnet chain that is switched into the circuit by opening current breakers. Experiments and simulation studies have been performed to identify the LHC circuits that need energy extraction. The required values of the extraction resistors have been computed. The outcome of the experimental results and the simulation studies are presented and the design of the different energy extraction systems that operate at 600 A and at 13 kA is described.

Dahlerup-Petersen, K; Schmidt, R; Sonnemann, F

2001-01-01T23:59:59.000Z

309

Carbon nanotube synthesis for integrated circuit interconnects  

E-Print Network (OSTI)

Based on their properties, carbon nanotubes (CNTs) have been identified as ideal replacements for copper interconnects in integrated circuits given their higher current density, inertness, and higher resistance to ...

Nessim, Gilbert Daniel

2009-01-01T23:59:59.000Z

310

The Challenge of Testing RFID Integrated Circuits  

Science Conference Proceedings (OSTI)

RFID integrated circuits often involve many of themost leading edge production technologies availabletoday. The complexities involved with integrating thesecomplexities into the backend and test environment areexceptionally challenging. To date, this ...

David Murfett

2004-01-01T23:59:59.000Z

311

Conformance and mirroring for timed asychronous circuits  

Science Conference Proceedings (OSTI)

Conformance has been used as a correctness criterion for asynchronous circuits. In the case of untimed systems, conformance of an implementation to a specification is equivalent to the failure-freeness between the implementation and the mirror of the ...

Bin Zhou; Tomohiro Yoneda; Bernd-Holger Schlingloff

2001-01-01T23:59:59.000Z

312

Quantum computation beyond the circuit model  

E-Print Network (OSTI)

The quantum circuit model is the most widely used model of quantum computation. It provides both a framework for formulating quantum algorithms and an architecture for the physical construction of quantum computers. However, ...

Jordan, Stephen Paul

2008-01-01T23:59:59.000Z

313

Symbolic Analysis of Nonlinear Analog Circuits  

Science Conference Proceedings (OSTI)

A new method is presented to model symbolically strongly nonlinear circuits, characterized by Piece-Wise Linear (PWL) functions. The method follows the idea of Bokhoven and Leenaerts, and formulates the problem as a linear complementarity problem (LCP). ...

Alicia Manthe; Zhao Li; C.-J. Richard Shi; Kartikeya Mayaram

2003-03-01T23:59:59.000Z

314

Measuring and Modeling Fault Density for Plume-Fault Encounter Probability Estimation  

Science Conference Proceedings (OSTI)

Emission of carbon dioxide from fossil-fueled power generation stations contributes to global climate change. Storage of this carbon dioxide within the pores of geologic strata (geologic carbon storage) is one approach to mitigating the climate change that would otherwise occur. The large storage volume needed for this mitigation requires injection into brine-filled pore space in reservoir strata overlain by cap rocks. One of the main concerns of storage in such rocks is leakage via faults. In the early stages of site selection, site-specific fault coverages are often not available. This necessitates a method for using available fault data to develop an estimate of the likelihood of injected carbon dioxide encountering and migrating up a fault, primarily due to buoyancy. Fault population statistics provide one of the main inputs to calculate the encounter probability. Previous fault population statistics work is shown to be applicable to areal fault density statistics. This result is applied to a case study in the southern portion of the San Joaquin Basin with the result that the probability of a carbon dioxide plume from a previously planned injection had a 3% chance of encountering a fully seal offsetting fault.

Jordan, P.D.; Oldenburg, C.M.; Nicot, J.-P.

2011-05-15T23:59:59.000Z

315

Dynamical Systems in Circuit Designer's Eyes  

SciTech Connect

Examples of nonlinear circuit design are given. Focus of the design process is on theory and engineering methods (as opposed to numerical analysis). Modeling is related to measurements It is seen that the phase plane is still very useful with proper models Harmonic balance/describing function offers powerful insight (via the combination of simulation with circuit and ODE theory). Measurement and simulation capabilities increased, especially harmonics measurements (since sinusoids are easy to generate)

Odyniec, M.

2011-05-09T23:59:59.000Z

316

Electrochemically controlled charging circuit for storage batteries  

DOE Patents (OSTI)

An electrochemically controlled charging circuit for charging storage batteries is disclosed. The embodiments disclosed utilize dc amplification of battery control current to minimize total energy expended for charging storage batteries to a preset voltage level. The circuits allow for selection of Zener diodes having a wide range of reference voltage levels. Also, the preset voltage level to which the storage batteries are charged can be varied over a wide range.

Onstott, E.I.

1980-06-24T23:59:59.000Z

317

Industry-Wide Database: Circuit Breakers  

Science Conference Proceedings (OSTI)

Best practice maintenance and asset management decisions are based on risks associated with actual equipment condition and performance. However, little effort has been made to systematically collect and analyze such industry information for high-voltage circuit breakers. This document presents the results of the initial effort of the Electric Power Research Institute (EPRI) to explore the development of an industry-wide database (IDB) for high-voltage circuit breakers (HVCBs). The project identified ...

2012-12-12T23:59:59.000Z

318

Ground State Entanglement Energetics  

E-Print Network (OSTI)

We consider the ground state of simple quantum systems coupled to an environment. In general the system is entangled with its environment. As a consequence, even at zero temperature, the energy of the system is not sharp: a projective measurement can find the system in an excited state. We show that energy fluctuation measurements at zero temperature provide entanglement information. For two-state systems which exhibit a persistent current in the ground state, energy fluctuations and persistent current fluctuations are closely related. The harmonic oscillator serves to illustrate energy fluctuations in a system with an infinite number of states. In addition to the energy distribution we discuss the energy-energy time-correlation function in the zero-temperature limit.

M. Buttiker; A. N. Jordan

2005-01-04T23:59:59.000Z

319

A fault location approach for fuzzy fault section estimation on radial distribution feeders  

E-Print Network (OSTI)

Locating the faulted section of a distribution system is a difficult task because of lack of accurate system models and the presence of uncertainty in the data used for estimating the fault section. Many of the methods used to account for the uncertainty use fuzzy logic techniques to estimate bounds of possibility of the input data and calculated quantities, or probabilistic modeling of the input data to estimate the likelihood of the location of the fault on a particular section of the feeder. Heuristic knowledge of control center dispatchers has also been used for uncertainty management. This thesis presents the design and implementation of a phase selector algorithm and a fault distance algorithm for use in an automated modular scheme for fault section estimation on radial distribution systems. These two algorithms will be executed in combination with two other fault location algorithms. The scheme is executed using the data record of an abnormal event in a three-stage scheme. The phase selector algorithm was used to obtain event-phase possibility values representing the possibility of involvement of each of the phases and the neutral in an event. A section-event possibility value that indicated the possibility that a section of the feeder was involved in the fault was evaluated using the event-phase possibility values and line section phase topology information. The fault distance algorithm was used to eliminate sections of the feeder that were not likely to be possible faulted section candidates by assuming a bolted fault and estimating its location. Each line section was assigned a fault possibility value of zero or one according to its location relative to the location of the fault. The phase selector algorithm was tested using real data measured at feeder substations and the fault distance algorithm was tested using data obtained by staging faults on a model of an overhead feeder using EMTP/ATP simulation. The results obtained from the tests were promising. A simple illustration of the combination of the results of the two algorithms is given. The result of this combination shows the potential of the simultaneous use of the two algorithms.

Andoh, Kwame Sarpong

2000-01-01T23:59:59.000Z

320

CEUS Ground Motion Project  

Science Conference Proceedings (OSTI)

Three utilities are currently pursuing early site permits (ESPs) for possible siting of new nuclear power plant facilities in the central and eastern United States (CEUS). The geological, seismological, and engineering characteristics of a site and its environs must be investigated in sufficient scope and detail. These investigations are needed to adequately evaluate a proposed site and to provide sufficient information for estimating the site's safe shutdown earthquake (SSE) ground motion. Nuclear Regul...

2003-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Stress and fault rock controls on fault zone hydrology, Coso geothermal  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Stress and fault rock controls on fault zone hydrology, Coso geothermal field, CA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Stress and fault rock controls on fault zone hydrology, Coso geothermal field, CA Details Activities (1) Areas (1) Regions (0) Abstract: In crystalline rock of the Coso Geothermal Field, CA, fractures are the primary source of permeability. At reservoir depths, borehole image, temperature, and mud logs indicate fluid flow is concentrated in extensively fractured damage zones of large faults well-oriented for slip.

322

Fast Fault Recovery in Switched Networks for Carrying IP Telephony Traffic.  

E-Print Network (OSTI)

?? One of the most parts of VOIP management is fault management and, in having a good fault management, finding good mechanisms to detect faults… (more)

Eisazadeh, Ali Akbar

2010-01-01T23:59:59.000Z

323

Ground Squirrels and Gophers  

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

Squirrels and Gophers Squirrels and Gophers Nature Bulletin No. 224-A April 2, 1966 Forest Preserve District of Cook County Seymour Simon, President Roland F. Eisenbeis, Supt. of Conservation GROUND SQUIRRELS AND GOPHERS On sunny summer days, a dusty-colored animal with yellowish and brown stripes, about the size of a small rat, often may be noticed creeping through the grass of prairies, pastures, golf courses or lawns. Watch him. He pauses every few feet to sit up, look and listen for a moment. Nervous and timid, he crouches low at every distant sound or passing shadow. Startle him and he scurries away, and then may suddenly halt and freeze, bolt upright, as stiff and straight as a stake driven in the ground. If approached, he gives a loud shrill trilling whistle and, with a flip of his tail, pops out of sight. Watch that spot closely and, in less than a minute, a snaky head appears. Be quiet. He has many enemies above ground and he also has a lot of curiosity. Presently he sits up upon his haunches again.

324

Triple effect absorption chiller utilizing two refrigeration circuits  

DOE Patents (OSTI)

A triple effect absorption method and apparatus having a high coefficient of performance. Two single effect absorption circuits are combined with heat exchange occurring between a condenser and absorber of a high temperature circuit, and a generator of a low temperature circuit. The evaporators of both the high and low temperature circuits provide cooling to an external heat load.

DeVault, Robert C. (Knoxville, TN)

1988-01-01T23:59:59.000Z

325

Control circuit for automatic battery chargers  

SciTech Connect

An improved battery charger apparatus having a control circuit providing different charging periods which are automatically correlated with the type of battery connected to the charge for charging the connected battery to a preselected full charge state. The apparatus has a charging circuit for charging the battery, a sensing circuit for sensing the state of the battery during charging thereof by the charging circuit and a circuit for determining first and second predetermined reference voltage/current states. The apparatus causes the charging of the battery at a preselected initial charging level for an initial time period and establishes a first finish time period. The apparatus further determines a first time at which the state of the battery reaches the first predetermined referenced voltage/current state during the initial time period, and causes the charging circuit to continue to charge the battery at a preselected first charging level after the determination of the first time for a first finish time period. The apparatus further establishes a second finish time period and determines a second time at which the state of the battery reaches the second predetermined referenced voltage/current state during the first finish time period. The apparatus terminates charging of the battery if the state of the battery does not reach the second predetermined referenced voltage/current state during the first finish time period, and causes the charging circuit to continue to charge the battery at a preselected second charging level after the determination of the second time for a second finish time period.

Lambert, F.J.; Bosack, D.J.; Johansen, D.K.

1984-05-22T23:59:59.000Z

326

Lithology, fault displacement, and origin of secondary calcium carbonate and opaline silica at Trenches 14 and 14D on the Bow Ridge Fault at Exile Hill, Nye County, Nevada  

SciTech Connect

Yucca Mountain, a proposed site for a high-level nuclear-waste repository, is located in southern Nevada, 20 km east of Beatty, and adjacent to the southwest comer of the Nevada Test Site (NTS) (fig. 1). Yucca Mountain is located within the Basin and Range province of the western United States. The climate is semiarid, and the flora is transitional between that of the Mojave Desert to the south and the Great Basin Desert to the north. As part of the evaluation, hydrologic conditions, especially water levels, of Yucca Mountain and vicinity during the Quaternary, and especially the past 20,000 years, are being characterized. In 1982, the US Geological Survey, in cooperation with the US Department of Energy (under interagency agreement DE-A104-78ET44802), excavated twenty-six bulldozer and backhoe trenches in the Yucca Mountain region to evaluate the nature and frequency of Quaternary faulting (Swadley and others, 1984). The trenches were oriented perpendicular to traces of suspected Quaternary faults and across projections of known bedrock faults into Quaternary deposits. Trench 14 exposes the Bow Ridge Fault on the west side of Exile Hill. Although the original purpose of the excavation of trench 14 was to evaluate the nature and frequency of Quaternary faulting on the Bow Ridge Fault, concern arose as to whether or not the nearly vertical calcium carbonate (the term ``carbonate`` in this study refers to calcium carbonate) and opaline silica veins in the fault zone were deposited by ascending waters (ground water). These veins resemble in gross morphology veins commonly formed by hydrothermal processes.

Taylor, E.M.; Huckins, H.E.

1995-02-01T23:59:59.000Z

327

VCSEL fault location apparatus and method  

DOE Patents (OSTI)

An apparatus for locating a fault within an optical fiber is disclosed. The apparatus, which can be formed as a part of a fiber-optic transmitter or as a stand-alone instrument, utilizes a vertical-cavity surface-emitting laser (VCSEL) to generate a test pulse of light which is coupled into an optical fiber under test. The VCSEL is subsequently reconfigured by changing a bias voltage thereto and is used as a resonant-cavity photodetector (RCPD) to detect a portion of the test light pulse which is reflected or scattered from any fault within the optical fiber. A time interval .DELTA.t between an instant in time when the test light pulse is generated and the time the reflected or scattered portion is detected can then be used to determine the location of the fault within the optical fiber.

Keeler, Gordon A. (Albuquerque, NM); Serkland, Darwin K. (Albuquerque, NM)

2007-05-15T23:59:59.000Z

328

Lookout device for high voltage circuit breaker  

DOE Patents (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the respective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, L.J.; Shirey, L.A.

1991-12-31T23:59:59.000Z

329

Lockout device for high voltage circuit breaker  

DOE Patents (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the respective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, L.J.; Shirey, L.A.

1993-01-26T23:59:59.000Z

330

Lockout device for high voltage circuit breaker  

Science Conference Proceedings (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the repsective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, Lawrence J. (New Kensington, PA); Shirey, Lawrence A. (North Huntingdon, PA)

1993-01-01T23:59:59.000Z

331

Dual circuit embossed sheet heat transfer panel  

DOE Patents (OSTI)

A heat transfer panel provides redundant cooling for fusion reactors or the like environment requiring low-mass construction. Redundant cooling is provided by two independent cooling circuits, each circuit consisting of a series of channels joined to inlet and outlet headers. The panel comprises a welded joinder of two full-size and two much smaller partial-size sheets. The first full-size sheet is embossed to form first portions of channels for the first and second circuits, as well as a header for the first circuit. The second full-sized sheet is then laid over and welded to the first full-size sheet. The first and second partial-size sheets are then overlaid on separate portions of the second full-sized sheet, and are welded thereto. The first and second partial-sized sheets are embossed to form inlet and outlet headers, which communicate with channels of the second circuit through apertures formed in the second full-sized sheet. 6 figs.

Morgan, G.D.

1984-02-21T23:59:59.000Z

332

Dual circuit embossed sheet heat transfer panel  

DOE Patents (OSTI)

A heat transfer panel provides redundant cooling for fusion reactors or the like environment requiring low-mass construction. Redundant cooling is provided by two independent cooling circuits, each circuit consisting of a series of channels joined to inlet and outlet headers. The panel comprises a welded joinder of two full-size and two much smaller partial-size sheets. The first full-size sheet is embossed to form first portions of channels for the first and second circuits, as well as a header for the first circuit. The second full-sized sheet is then laid over and welded to the first full-size sheet. The first and second partial-size sheets are then overlaid on separate portions of the second full-sized sheet, and are welded thereto. The first and second partial-sized sheets are embossed to form inlet and outlet headers, which communicate with channels of the second circuit through apertures formed in the second full-sized sheet.

Morgan, Grover D. (St. Louis County, MO)

1984-01-01T23:59:59.000Z

333

Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada | Open  

Open Energy Info (EERE)

Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Abstract Precise definition of geometric relationships between individual basins and ranges may help to reveal the mechanical processes of Basin and Range Cenozoic extensional faulting at depth. Previous studies have attempted to identify simple horsts and grabens, tilted crustal blocks with planar faulting, or tilted crustal blocks with listric faulting in the shallow crust. Normal faults defining these crustal blocks may root (1) individually in the ductile lower crust, (2) in regional or local low-angle detachment faults, or (3) in igneous intrusions or decoupling surfaces

334

Synthesis and evaluation of fault-tolerant quantum computer architectures  

E-Print Network (OSTI)

Fault-tolerance is the cornerstone of practical, large-scale quantum computing, pushed into its prominent position with heroic theoretical efforts. The fault-tolerance threshold, which is the component failure probability ...

Cross, Andrew W. (Andrew William), 1979-

2005-01-01T23:59:59.000Z

335

Scalable Distributed Consensus to Support MPI Fault Tolerance  

Science Conference Proceedings (OSTI)

As system sizes increase, the amount of time in which an application can run without experiencing a failure decreases. Exascale applications will need to address fault tolerance. In order to support algorithm-based fault tolerance, communication libraries ...

Darius Buntinas

2012-05-01T23:59:59.000Z

336

Rough neural fault classification for hvdc power systems  

Science Conference Proceedings (OSTI)

This Ph.D. thesis proposes an approach to classify faults that commonly occur in a High Voltage Direct Current (HVDC) power system. These faults are distributed throughout the entire HVDC system. The most recently published techniques for power system ...

Liting Han

2008-01-01T23:59:59.000Z

337

High-level test synthesis for delay fault testability  

Science Conference Proceedings (OSTI)

A high-level test synthesis (HLTS) method targeted for delay fault testability is presented. The proposed method, when combined with hierarchical test pattern generation for embedded modules, guarantees 100% delay test coverage for detectable faults ...

Sying-Jyan Wang; Tung-Hua Yeh

2007-04-01T23:59:59.000Z

338

MODELING AND SIMULATION OF HVAC FAULTS IN ENERGYPLUS  

E-Print Network (OSTI)

sensor faults, Energy and Buildings. 42(4). April 2010.faults in buildings. Energy and Buildings. 42(1). Januaryon the DOE-2 model, Energy and Buildings. 21(2). 1994, Pages

Basarkar, Mangesh

2013-01-01T23:59:59.000Z

339

Stability of Distributed Algorithms in the Face of Incessant Faults  

Science Conference Proceedings (OSTI)

For large distributed systems built from inexpensive components, one expects to see incessant failures. This paper proposes two models for such faults and analyzes two well-known self-stabilizing algorithms under these fault models. For a small number ...

Robert E. Lee Deville; Sayan Mitra

2009-11-01T23:59:59.000Z

340

Design and Evaluation of Hybrid Fault-Detection Systems  

Science Conference Proceedings (OSTI)

As chip densities and clock rates increase, processors are becoming more susceptible to transient faults that can affect program correctness. Up to now, system designers have primarily considered hardware-only and software-only fault-detection mechanisms ...

George A. Reis; Jonathan Chang; Neil Vachharajani; Ram Rangan; David I. August; Shubhendu S. Mukherjee

2005-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Two-person control administration: preventing administration faults through duplication  

Science Conference Proceedings (OSTI)

Modern computing systems are complex and difficult to administer, making them more prone to system administration faults. Faults can occur simply due to mistakes in the process of administering a complex system. These mistakes can make the system insecure ...

Shaya Potter; Steven M. Bellovin; Jason Nieh

2009-11-01T23:59:59.000Z

342

Fault Current Limiters (FCL) Fact Sheet | Department of Energy  

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

& Publications An Assessment of Fault Current Limiter Testing Requirements Superconductivity Program Overview Superconductivity for Electric Systems: 2008 Annual Peer Review...

343

EPRI Fault Current Management Guidebook, Sixth Edition (Maroon Book)  

Science Conference Proceedings (OSTI)

This document is an update of the document Fault Current Management Guidebook, Fifth Edition on fault current effects and management in transmission and distribution systems. This guide is intended to be a snapshot of available references, information, and literature on the effects of high fault current on a number of power system components and various available and emerging fault-current-limiting technologies.Results and FindingsDue to increased ...

2012-12-31T23:59:59.000Z

344

Underground Cable Fault Location Reference and Application Guide  

Science Conference Proceedings (OSTI)

This report summarizes underground cable fault location methods and details the application of the methods for transmission and distribution cable systems. It summarizes both terminal location and tracer location methods that can be applied to transmission and distribution cable systems. The report is an update to a summary of fault location methods. It provides practical technical material in the art and science of locating cable faults, including a description of common fault location instruments and p...

2011-12-23T23:59:59.000Z

345

Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources  

SciTech Connect

This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based distributed energy resources.

Keller, J.; Kroposki, B.

2010-01-01T23:59:59.000Z

346

Package for integrated optic circuit and method  

DOE Patents (OSTI)

A structure and method for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package.

Kravitz, Stanley H. (26 Aspen Rd., Placitas, NM 87043); Hadley, G. Ronald (6012 Annapolis NE., Albuquerque, NM 87111); Warren, Mial E. (3825 Mary Ellen NE., Albuquerque, NM 87111); Carson, Richard F. (1036 Jewel Pl. NE., Albuquerque, NM 87123); Armendariz, Marcelino G. (1023 Oro Real NE., Albuquerque, NM 87123)

1998-01-01T23:59:59.000Z

347

Package for integrated optic circuit and method  

DOE Patents (OSTI)

A structure and method are disclosed for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package. 6 figs.

Kravitz, S.H.; Hadley, G.R.; Warren, M.E.; Carson, R.F.; Armendariz, M.G.

1998-08-04T23:59:59.000Z

348

Radiation-hardened transistor and integrated circuit  

DOE Patents (OSTI)

A composite transistor is disclosed for use in radiation hardening a CMOS IC formed on an SOI or bulk semiconductor substrate. The composite transistor has a circuit transistor and a blocking transistor connected in series with a common gate connection. A body terminal of the blocking transistor is connected only to a source terminal thereof, and to no other connection point. The blocking transistor acts to prevent a single-event transient (SET) occurring in the circuit transistor from being coupled outside the composite transistor. Similarly, when a SET occurs in the blocking transistor, the circuit transistor prevents the SET from being coupled outside the composite transistor. N-type and P-type composite transistors can be used for each and every transistor in the CMOS IC to radiation harden the IC, and can be used to form inverters and transmission gates which are the building blocks of CMOS ICs.

Ma, Kwok K. (Albuquerque, NM)

2007-11-20T23:59:59.000Z

349

Dynamic Rupture and Ground Motion Modeling on Realistically Complex Strike-Slip Faults  

E-Print Network (OSTI)

for an Alaskan-Aleutian megathrust earthquake. ”for an Alaskan-Aleutian megathrust earthquake. ”for an Alaskan-Aleutian megathrust earthquake. ”

Lozos, Julian Charles

2013-01-01T23:59:59.000Z

350

Dynamic Rupture through a Branched Fault Configuration at Yucca Mountain, and Resulting Ground Motions  

E-Print Network (OSTI)

-term care. Now, after decades of expensive false starts, and with an uncertain future for Yucca Mountain Yucca Mountain can handle, even if the statutory limits on its capacity are doubled repository. Second, it is unclear whether Yucca Mountain will ever receive a license from the Nuclear

Bhat, Harsha S.

351

Fault Diagnosis of Transformer Based on Probabilistic Neural Network  

Science Conference Proceedings (OSTI)

In order to improve the correct rate of transformer fault diagnosis based on three-ratio method of traditional dissolved gas analysis (DGA), a novel intelligent transformer fault diagnosis method based on both DGA and probabilistic neural network (PNN) ... Keywords: transformer fault diagnosis, probabilistic neural network (PNN), improved three-ratio method

Li Song; Li Xiu-ying; Wang Wen-xu

2011-03-01T23:59:59.000Z

352

New Burnside Anticline: part of Fluorspar area fault complex  

SciTech Connect

Field mapping in the Abbott Formation and examination of topographic lineaments in the Creal Springs, Stonefort, Eddyville, and Harrisburg Quadrangles (southeastern Illinois) reveal the New Burnside anticline and its northeastern extension, the Stonefort anticline to be a single, extensively faulted structure. Interpretation of this evidence also leads to the conclusion that this is a fault-block structure rather than an anticline. Trending notheast-southwest, the structure seems to be the northwesternmost extent of the Fluorspar Area fault complex. The authors found evidence for two episodes of faulting. The first involved northeast-trending, high-angle faults similar to those in the known Fluorspar complex to the southeast. Faults on the northeast (Stonefort antilcine) step down toward the center of the structure, forming a graben. Vertical movement also occurred to the southwest (New Burnside anticline), but the structure in this vicinity is a horst with some blocks tilted. As with other faults in the Fluorspar complex, horizontal slickensides are present locally. The second episode of movement occurred along northwest-southeast-trending strike-slip faults that offset the northeast-trending high-angle faults. This second phase of faulting may correspond with previously reported reactivation of northwest-trending faults elsewhere in the Fluorspar Area fault complex.

Jacobson, R.J.; Trask, C.B.

1983-09-01T23:59:59.000Z

353

Rigorous Development of Dependable Systems Using Fault Tolerance Views  

Science Conference Proceedings (OSTI)

This paper introduces the Mode and Fault Tolerance Views approach to stepwise rigorous development of critical systems. It supports systematic, structured and recursive modelling of system fault tolerance, including error detection, error recovery and ... Keywords: formal methods, Event-B, fault tolerance, modal systems, case study, AOCS

Ilya Lopatkin; Alexei Iliasov; Alexander Romanovsky

2011-11-01T23:59:59.000Z

354

Yet Another Fault Injection Technique : by Forward Body Biasing Injection  

E-Print Network (OSTI)

expensive fault injection tech- niques, like clock or voltage glitches, are well taken into accountYet Another Fault Injection Technique : by Forward Body Biasing Injection K. TOBICH1,2, P. MAURINE1 Injection, Electromag- netic Attacks, RSA, Chinese Remainder Theorem 1 Introduction Fault injection

355

Statistical estimation of multiple faults in aircraft gas turbine engines  

E-Print Network (OSTI)

415 Statistical estimation of multiple faults in aircraft gas turbine engines S Sarkar, C Rao of multiple faults in aircraft gas-turbine engines, based on a statistical pattern recognition tool called commercial aircraft engine. Keywords: aircraft propulsion, gas turbine engines, multiple fault estimation

Ray, Asok

356

Applications of fault detection methods to industrial processes  

Science Conference Proceedings (OSTI)

Components of industrial processes are often affected by un-permitted or un-expected deviations from normal operation behaviour. The fault detection task consists of determination of the fault present in a system and the time of detection. In addition ... Keywords: fault detection and diagnosis, industrial processes, residuals, symptoms

Ioana Fagarasan; S. S. T. Iliescu

2008-06-01T23:59:59.000Z

357

Collective operations in application-level fault-tolerant MPI  

Science Conference Proceedings (OSTI)

Fault-tolerance is becoming a critical issue on high-performance platforms. Checkpointing techniques make programs fault-tolerant by saving their state periodically and restoring this state after failure. System-level checkpointing saves the state ... Keywords: MPI, application-level checkpointing, collective communication, fault-tolerance, non-FIFO communication, scientific computing

Greg Bronevetsky; Daniel Marques; Keshav Pingali; Paul Stodghill

2003-06-01T23:59:59.000Z

358

Outlier Detection Rules for Fault Detection in Solar Photovoltaic Arrays  

E-Print Network (OSTI)

fault detection. Furthermore, the proposed models become more reliable as the number of PV measurements analysis specifically for PV installation. Several fault detection models and monitoring systems have been studied for PV systems [8]­[14]. PV monitoring and fault detection models based on energy yield and power

Lehman, Brad

359

A lightweight fault tolerance framework for Web services  

Science Conference Proceedings (OSTI)

In this paper, we present the design and implementation of a lightweight fault tolerance framework for Web services. With our framework, a Web service can be rendered fault tolerant by replicating it across several nodes. A consensus-based algorithm ... Keywords: Fault tolerance, Web services, distributed consensus, reliable messaging, replication

Wenbing Zhao; Honglei Zhang; Hua Chai

2009-08-01T23:59:59.000Z

360

Quantum Electric Circuits Analogous to Ballistic Conductors  

E-Print Network (OSTI)

The conductance steps in a constricted two-dimensional electron gas and the minimum conductivity in graphene are related to a new uncertainty relation between electric charge and conductance in a quantized electric circuit that mimics the electric transport in mesoscopic systems. This uncertainty relation makes specific use of the discreteness of electric charge. Quantum electric circuits analogous to both constricted two-dimensional electron gas and graphene are introduced. In the latter case a new insight into the origin of minimum conductivity is obtained.

Daniela Dragoman

2007-08-09T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Hybrid high direct current circuit interrupter  

DOE Patents (OSTI)

A device and a method are disclosed for interrupting very high direct currents (greater than 100,000 amperes) and simultaneously blocking high voltages (greater than 600 volts). The device utilizes a mechanical switch to carry very high currents continuously with low loss and a silicon controlled rectifier (SCR) to bypass the current around the mechanical switch while its contacts are separating. A commutation circuit, connected in parallel with the SCR, turns off the SCR by utilizing a resonant circuit to divert the SCR current after the switch opens. 7 figs.

Rockot, J.H.; Mikesell, H.E.; Jha, K.N.

1998-08-11T23:59:59.000Z

362

Hybrid high direct current circuit interrupter  

DOE Patents (OSTI)

A device and a method for interrupting very high direct currents (greater than 100,000 amperes) and simultaneously blocking high voltages (greater than 600 volts). The device utilizes a mechanical switch to carry very high currents continuously with low loss and a silicon controlled rectifier (SCR) to bypass the current around the mechanical switch while its contacts are separating. A commutation circuit, connected in parallel with the SCR, turns off the SCR by utilizing a resonant circuit to divert the SCR current after the switch opens.

Rockot, J.H.; Mikesell, H.E.; Jha, K.N.

1996-12-31T23:59:59.000Z

363

Fault reconnaissance agent for sensor networks  

Science Conference Proceedings (OSTI)

One of the key prerequisite for a scalable, effective and efficient sensor network is the utilization of low-cost, low-overhead and high-resilient fault-inference techniques. To this end, we propose an intelligent agent system with a problem solving ... Keywords: Management, expectation maximization algorithm, intelligent agents, wireless sensor networks

Elhadi M. Shakshuki; Xinyu Xing; Tarek R. Sheltami

2010-08-01T23:59:59.000Z

364

Optimized Fault Location Final Project Report  

E-Print Network (OSTI)

excessive currents and voltages last long enough to cause equipment damage. CBs have the purpose to connect describes connectivity of the various components in the power system. In order to process retrieved fault, the system topology must be known. Beside the connectivity it is necessary to obtain information about

365

Triple effect absorption chiller utilizing two refrigeration circuits  

Science Conference Proceedings (OSTI)

This patent describes a heat absorption method for an absorption chiller. It comprises: providing a firs absorption system circuit for operation within a first temperature range, providing a second absorption system circuit for operation within a second temperature range; heat exchanging refrigerant and absorber solution; thermal communication with an external heat load. This patent describes a heat absorption apparatus for use as an absorption chiller. It includes: a first absorption system circuit for operation within a first temperature range; a second absorption system circuit for operation within a second temperature range which has a lower maximum temperature relative to the first temperature range; the first circuit having generator means, condenser means, evaporator means, and absorber means operatively connected together; the second circuit having generator means condenser means, evaporator means, and absorber means operative connected together; and the first circuit condenser means and the first circuit absorber means being in heat exchange communication with the second circuit generator means.

DeVault, R.C.

1988-03-22T23:59:59.000Z

366

Ground potential rise monitor  

SciTech Connect

A device and method for detecting ground potential rise (GPR) comprising positioning a first electrode and a second electrode at a distance from each other into the earth. The voltage of the first electrode and second electrode is attenuated by an attenuation factor creating an attenuated voltage. The true RMS voltage of the attenuated voltage is determined creating an attenuated true RMS voltage. The attenuated true RMS voltage is then multiplied by the attenuation factor creating a calculated true RMS voltage. If the calculated true RMS voltage is greater than a first predetermined voltage threshold, a first alarm is enabled at a local location. If user input is received at a remote location acknowledging the first alarm, a first alarm acknowledgment signal is transmitted. The first alarm acknowledgment signal is then received at which time the first alarm is disabled.

Allen, Zachery W. (Mandan, ND); Zevenbergen, Gary A. (Arvada, CO)

2012-04-03T23:59:59.000Z

367

Effects of uranium mining of ground water in Ambrosia Lake area, New Mexico  

SciTech Connect

The principal ore-bearing zone in the Ambrosia Lake area of the Grants uranium district is the Westwater Canyon Member of the Morrison Formation (Jurassic). This unit is also one of the major artesian aquifers in the region. Significant declines in the potentiometric lead within the aquifer have been recorded, although cones of depression do not appear to have spread laterally more than a few miles. Loss of potentiometric head in the Westwater Canyon Member has resulted in the interformational migration of ground water along fault zones from overlying aquifers of Cretaceous age. This migration has produced local deterioration in chemical quality of the ground water.

Kelly, T.E.; Link, R.L.; Schipper, M.R.

1980-01-01T23:59:59.000Z

368

Ground Gravity Survey At Baltazor Hot Springs Area (Isherwood & Mabey,  

Open Energy Info (EERE)

Ground Gravity Survey At Baltazor Hot Springs Area (Isherwood & Mabey, Ground Gravity Survey At Baltazor Hot Springs Area (Isherwood & Mabey, 1978) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Gravity Survey At Baltazor Hot Springs Area (Isherwood & Mabey, 1978) Exploration Activity Details Location Baltazor Hot Springs Area Exploration Technique Ground Gravity Survey Activity Date Usefulness not indicated DOE-funding Unknown Notes The gravity map of the Baltazor KGRA (Fig. 2) shows a gravity low within the valley area that presumably is related to low-density Cenozoic sediments. The steep gravity gradient along the east side of the valley suggests a north-trending normal fault. The thickness of low-density fill is estimated to be about 300 m in the southwestern part of the KGRA and

369

Electronic circuit for measuring series connected electrochemical cell voltages  

DOE Patents (OSTI)

An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The electronic circuit includes a plurality of energy storage cells forming the energy storage device. A voltage divider circuit is connected to at least one of the energy storage cells. A current regulating circuit is provided for regulating the current through the voltage divider circuit. A voltage measurement node is associated with the voltage divider circuit for producing a voltage signal which is proportional to the voltage across the energy storage cell.

Ashtiani, Cyrus N. (West Bloomfield, MI); Stuart, Thomas A. (Toledo, OH)

2000-01-01T23:59:59.000Z

370

Coordinated Fault Tolerance for High-Performance Computing  

SciTech Connect

Our work to meet our goal of end-to-end fault tolerance has focused on two areas: (1) improving fault tolerance in various software currently available and widely used throughout the HEC domain and (2) using fault information exchange and coordination to achieve holistic, systemwide fault tolerance and understanding how to design and implement interfaces for integrating fault tolerance features for multiple layers of the software stack—from the application, math libraries, and programming language runtime to other common system software such as jobs schedulers, resource managers, and monitoring tools.

Dongarra, Jack; Bosilca, George; et al.

2013-04-08T23:59:59.000Z

371

Grinding circuit control using programmable logic controllers  

Science Conference Proceedings (OSTI)

This paper presents an application for cement milling system. In this application the process is controlled by software running on Programmable Logic Controllers. The appliance used to observe industrial process show the following mill parameters: feed ... Keywords: PLC programming, ball mill, clinker grinding, grinding circuit, programmable logic controllers

Costea R. Claudiu; Silaghi Helga Maria; Rohde L. Ulrich; Silaghi A. Marius

2011-08-01T23:59:59.000Z

372

Three-dimensional Integrated Circuit Design  

Science Conference Proceedings (OSTI)

With vastly increased complexity and functionality in the "nanometer era" (i.e. hundreds of millions of transistors on one chip), increasing the performance of integrated circuits has become a challenging task. This is due primarily to the inevitable ... Keywords: Computer Architecture, Computer Engineering, Computer Science

Vasilis F. Pavlidis; Eby G. Friedman

2008-09-01T23:59:59.000Z

373

Ground Water Management Regulations (Louisiana) | Department...  

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

Ground Water Management Regulations (Louisiana) Ground Water Management Regulations (Louisiana) Eligibility Agricultural Construction Developer Fuel Distributor Industrial...

374

Abstract: This paper describes the on-going work done by Hydro-Qubec to optimize the settings of automatic devices  

E-Print Network (OSTI)

operation of the RPTC system. Figure 1 illustrates RPTC systems distributed in fifteen 735 kV substations: Normal contingencies and extreme conting Three phase fault with normal clearing Single line to ground-circuit line Normal Contingencies Loss of any element without fault Single line to ground fault with loss

Wehenkel, Louis

375

Active Fault Segments As Potential Earthquake Sources- Inferences From  

Open Energy Info (EERE)

Active Fault Segments As Potential Earthquake Sources- Inferences From Active Fault Segments As Potential Earthquake Sources- Inferences From Integrated Geophysical Mapping Of The Magadi Fault System, Southern Kenya Rift Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Active Fault Segments As Potential Earthquake Sources- Inferences From Integrated Geophysical Mapping Of The Magadi Fault System, Southern Kenya Rift Details Activities (0) Areas (0) Regions (0) Abstract: Southern Kenya Rift has been known as a region of high geodynamic activity expressed by recent volcanism, geothermal activity and high rate of seismicity. The active faults that host these activities have not been investigated to determine their subsurface geometry, faulting intensity and constituents (fluids, sediments) for proper characterization of tectonic

376

Definition: Enhanced Fault Detection Technology | Open Energy Information  

Open Energy Info (EERE)

Technology Technology Jump to: navigation, search Dictionary.png Enhanced Fault Detection Technology Enhanced fault detection technology enables higher precision and greater discrimination of fault location and type with coordinated measurement among multiple devices. For distribution applications, this technology can detect and isolate faults without full-power re-closing, reducing the frequency of through-fault currents. Using high resolution sensors and fault signatures, this technology can better detect high impedance faults. For transmission applications, this technology will employ high speed communications between multiple elements (e.g., stations) to protect entire regions, rather than just single elements. It can also use the latest digital techniques to advance beyond conventional impedance relaying of

377

New method for abbreviating the fault tree graphical representation  

SciTech Connect

Fault tree analysis is being widely used for reliability and safety analysis of systems encountered in the nuclear industry and elsewhere. A disadvantage of the fault tree method is the voluminous fault tree graphical representation that conventionally results from analysis of a complex system. Previous methods for shortening the fault tree graphical representation include (1) transfers within the fault tree, and (2) the use of the SAMPLE (K out of N logic) gate, the MATRIX gate, and the SUMMATION gate. The purpose of this presentation is to introduce TABULATION gates as a method to abbreviate the fault tree graphical representation. These new gates reduce the cost of analysis and generally increase the system behavior visibility that is inherent in the fault tree technique. (auth)

Stewart, M.E.; Fussell, J.B.; Crump, R.J.

1974-12-01T23:59:59.000Z

378

Upper crustal faulting in an obliquely extending orogen, structural control  

Open Energy Info (EERE)

faulting in an obliquely extending orogen, structural control faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Upper crustal faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Details Activities (1) Areas (1) Regions (0) Abstract: New multifold seismic reflection data from the Coso geothermal field in the central Coso Range, eastern California, image brittle faults and other structures in a zone of localized crustal extension between two major strike-slip faults. The Coso Wash fault, a Quaternary-active normal fault that is a locus of surface geothermal activity, is well-imaged as a

379

Circuit design for embedded memory in low-power integrated circuits  

E-Print Network (OSTI)

This thesis explores the challenges for integrating embedded static random access memory (SRAM) and non-volatile memory-based on ferroelectric capacitor technology-into lowpower integrated circuits. First considered is the ...

Qazi, Masood

2012-01-01T23:59:59.000Z

380

Parallel algorithms for inductance extraction of VLSI circuits  

Science Conference Proceedings (OSTI)

Inductance extraction involves estimating the mutual inductance in a VLSI circuit. Due to increasing clock speed and diminishing feature sizes of modern VLSI circuits, the effects of inductance are increasingly felt during the testing and verification ...

Hemant Mahawar; Vivek Sarin

2006-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

The sizing rules method for analog integrated circuit design  

Science Conference Proceedings (OSTI)

This paper presents the sizing rules method for analog CMOS circuit design that consists of: first, the development of a hierarchical library of transistor pair groups as basic building blocks for analog CMOS circuits; second, the derivation of ...

H. Graeb; S. Zizala; J. Eckmueller; K. Antreich

2001-11-01T23:59:59.000Z

382

Isotopic evidence for the infiltration of mantle and metamorphic CO2-H2O fluids from below in faulted rocks from the San Andreas Fault System  

SciTech Connect

To characterize the origin of the fluids involved in the San Andreas Fault (SAF) system, we carried out an isotope study of exhumed faulted rocks from deformation zones, vein fillings and their hosts and the fluid inclusions associated with these materials. Samples were collected from segments along the SAF system selected to provide a depth profile from upper to lower crust. In all, 75 samples from various structures and lithologies from 13 localities were analyzed for noble gas, carbon, and oxygen isotope compositions. Fluid inclusions exhibit helium isotope ratios ({sup 3}He/{sup 4}He) of 0.1-2.5 times the ratio in air, indicating that past fluids percolating through the SAF system contained mantle helium contributions of at least 35%, similar to what has been measured in present-day ground waters associated with the fault (Kennedy et al., 1997). Calcite is the predominant vein mineral and is a common accessory mineral in deformation zones. A systematic variation of C- and O-isotope compositions of carbonates from veins, deformation zones and their hosts suggests percolation by external fluids of similar compositions and origin with the amount of fluid infiltration increasing from host rocks to vein to deformation zones. The isotopic trend observed for carbonates in veins and deformation zones follows that shown by carbonates in host limestones, marbles, and other host rocks, increasing with increasing contribution of deep metamorphic crustal volatiles. At each crustal level, the composition of the infiltrating fluids is thus buffered by deeper metamorphic sources. A negative correlation between calcite {delta}{sup 13}C and fluid inclusion {sup 3}He/{sup 4}He is consistent with a mantle origin for a fraction of the infiltrating CO{sub 2}. Noble gas and stable isotope systematics show consistent evidence for the involvement of mantle-derived fluids combined with infiltration of deep metamorphic H{sub 2}O and CO{sub 2} in faulting, supporting the involvement of deep fluids percolating through and perhaps weakening the fault zone. There is no clear evidence for a significant contribution from meteoric water, except for overprinting related to late weathering.

Pili, E.; Kennedy, B.M.; Conrad, M.E.; Gratier, J.-P.

2010-12-15T23:59:59.000Z

383

Dual-circuit segmented rail phased induction motor  

DOE Patents (OSTI)

An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The opposed segmented rail circuit is either a plurality of similar conductive coils that are shorted, or a plurality of ladders formed of opposed conductive bars connected by a plurality of spaced conductors. In each embodiment, the conductors are preferably cables formed from a plurality of intertwined insulated wires to carry current evenly.

Marder, Barry M. (Albuquerque, NM); Cowan, Jr., Maynard (Albuquerque, NM)

2002-01-01T23:59:59.000Z

384

Field Guide: High-Voltage Circuit Breaker Compressors – 2013 Update  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breaker mechanisms have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may mis-operate or fail. A circuit breaker mis-operation may cause equipment damage and outages—both ...

2013-12-19T23:59:59.000Z

385

Designing Crushing and Grinding Circuits for Improved Energy ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Crushing and grinding, or comminution, circuits are the most ... Materialization of Manganese by Selective Precipitation from Used Battery.

386

EPA Final Ground Water Rule  

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

Office of Nuclear Safety and Environment Office of Nuclear Safety and Environment Nuclear Safety and Environment Information Brief HS-20-IB-2007-02 (March 2007) EPA Final Ground Water Rule Safe Drinking Water Act: National Primary Drinking Water Regulations Ground Water Rule - 40 CFR Parts 9, 141 and 142 Final Rule: 71 FR 65574 Effective Date: January 8, 2007 1 RULE SYNOPSIS On November 8, 2006, the U.S. Environmental Protection Agency (EPA) published a final Ground Water Rule (GWR) to promote increased protection against microbial pathogens that may be present in public water systems (PWSs) that use ground water sources for their supply (these systems are known as ground water systems). This Rule establishes a risk-targeted approach

387

Undulator Hall Air Temperature Fault Scenarios  

SciTech Connect

Recent experience indicates that the LCLS undulator segments must not, at any time following tuning, be allowed to change temperature by more than about {+-}2.5 C or the magnetic center will irreversibly shift outside of acceptable tolerances. This vulnerability raises a concern that under fault conditions the ambient temperature in the Undulator Hall might go outside of the safe range and potentially could require removal and retuning of all the segments. In this note we estimate changes that can be expected in the Undulator Hall air temperature for three fault scenarios: (1) System-wide power failure; (2) Heating Ventilation and Air Conditioning (HVAC) system shutdown; and (3) HVAC system temperature regulation fault. We find that for either a system-wide power failure or an HVAC system shutdown (with the technical equipment left on), the short-term temperature changes of the air would be modest due to the ability of the walls and floor to act as a heat ballast. No action would be needed to protect the undulator system in the event of a system-wide power failure. Some action to adjust the heat balance, in the case of the HVAC power failure with the equipment left on, might be desirable but is not required. On the other hand, a temperature regulation failure of the HVAC system can quickly cause large excursions in air temperature and prompt action would be required to avoid damage to the undulator system.

Sevilla, J.

2010-11-17T23:59:59.000Z

388

Transistor sizing for large combinational digital CMOS circuits  

Science Conference Proceedings (OSTI)

This article describes a new method to determine the device sizes of combinational digital CMOS circuits for an upper limit on the signal propagation delays. By modeling gate delay and area or power consumption of a circuit as a simple analytical function ... Keywords: Transistor sizing, digital combinational CMOS circuits, timing optimization

Lucas S. Heusler; Wolfgang Fichtner

1991-01-01T23:59:59.000Z

389

Analytical Model for the CMOS Short-Circuit Power Dissipation  

Science Conference Proceedings (OSTI)

A significant part of the power dissipation in CMOS digital circuits is due to the short-circuit currents. In this paper an accurate analytical model for the evaluation of the CMOS short-circuit power dissipation, on the basis of a CMOS inverter, is ...

L. Bisdounis; S. Nikolaidis; O. Koufopavlou

1998-04-01T23:59:59.000Z

390

Intelligent Circuit Breaker Forecasting and Prewarning System Research  

Science Conference Proceedings (OSTI)

This paper describes an intelligent circuit breaker software and hardware design, real-time multi-task alarm system will be introduced into circuit breaker monitoring and control, to the timely opening and timely alarm. According to the different impact ... Keywords: Intelligent circuit breaker, forecasting, prewarning

Jiaomin Liu; Li Li; Yaxuan Li; Peng Liu

2008-10-01T23:59:59.000Z

391

A hardware Memetic accelerator for VLSI circuit partitioning  

Science Conference Proceedings (OSTI)

During the last decade, the complexity and size of circuits have been rapidly increasing, placing a stressing demand on industry for faster and more efficient CAD tools for VLSI circuit layout. One major problem is the computational requirements for ... Keywords: Circuit partitioning, FPGA, Genetic algorithms, Handel-C, Hardware accelerator, Memetic algorithms

Stephen Coe; Shawki Areibi; Medhat Moussa

2007-07-01T23:59:59.000Z

392

Evaluation and Testing of ABB Circuit Breakers with Mobilgrease 28  

Science Conference Proceedings (OSTI)

The information in this document is intended to assist plants in evaluating the use of Mobilgrease 28 in ABB K-Line and HK circuit breakers and determining the maintenance intervals of these circuit breakers. The information in this document is applicable to both ABB K-Line and HK (air-blast) circuit breakers.

2001-10-30T23:59:59.000Z

393

Characterization of AMOLED pixel circuit without power line  

Science Conference Proceedings (OSTI)

We fabricated and evaluated the simple active matrix organic light emitting diode (AMOLED) pixel circuits without power line and proved that it is useful for the AMOLED display. Without power line in the pixel circuit we got higher-aperture ratio of ... Keywords: AMOLED, OLED, Pixel circuit, Thin film transistor

Seon Pyo Hong; Dong Sung Moon; Byung Seong Bae

2012-01-01T23:59:59.000Z

394

A Mixed Signal Fuzzy Controller Using Current Mode Circuits  

Science Conference Proceedings (OSTI)

A mixed analog-digital fuzzy logic inference processor chip, designed in a 0.35-?m CMOS technology, is presented. The analog fuzzy engine is based on a novel current-mode CMOS circuit used for the implementation of fuzzy partition membership functions. ... Keywords: current-mode circuits, fuzzy partitioning, inference engine, membership function circuits

Simone Orcioni; Giorgio Biagetti; Massimo Conti

2004-02-01T23:59:59.000Z

395

Automatic stability checking for large linear analog integrated circuits  

Science Conference Proceedings (OSTI)

Stability analysis is one of the key challenges in the design of large linear analog circuits with complex multi-loop structures. In this paper, we present an efficient loop finder algorithm to identify potentially unstable loops in such circuits. At ... Keywords: analog circuit design, eigenvalue problem, model order reduction, small-signal analysis, stability analysis

Parijat Mukherjee; G. Peter Fang; Rod Burt; Peng Li

2011-06-01T23:59:59.000Z

396

Technique for extending the range of a signal measuring circuit  

DOE Patents (OSTI)

An input signal supplied to a signal measuring circuit is either amplified or attenuated as necessary to establish the magnitude of the input signal within the defined dynamic range of the measuring circuit and the output signal developed by the measuring circuit is subsequently readjusted through amplification or attenuation to develop an output signal which corresponds to the magnitude of the initial input signal.

Chaprnka, Anthony G. (Cockeysville, MD); Sun, Shan C. (Pittsburgh, PA); Vercellotti, Leonard C. (Verona, PA)

1978-01-01T23:59:59.000Z

397

Symbolic analysis of analog circuits with hard nonlinearity  

Science Conference Proceedings (OSTI)

A new methodology is presented to solve a strongly nonlinear circuit, characterized by Piece-Wise Linear (PWL) functions, symbolically and explicitly in terms of its circuit parameters and is amenable to computer implementation. The method is based on ... Keywords: PWL, circuit nonlinearity, symbolic analysis

Alicia Manthe; Zhao Li; C.-J. Richard Shi

2003-06-01T23:59:59.000Z

398

Calculating the probability of injected carbon dioxide plumes encountering faults  

Science Conference Proceedings (OSTI)

One of the main concerns of storage in saline aquifers is leakage via faults. In the early stages of site selection, site-specific fault coverages are often not available for these aquifers. This necessitates a method using available fault data to estimate the probability of injected carbon dioxide encountering and migrating up a fault. The probability of encounter can be calculated from areal fault density statistics from available data, and carbon dioxide plume dimensions from numerical simulation. Given a number of assumptions, the dimension of the plume perpendicular to a fault times the areal density of faults with offsets greater than some threshold of interest provides probability of the plume encountering such a fault. Application of this result to a previously planned large-scale pilot injection in the southern portion of the San Joaquin Basin yielded a 3% and 7% chance of the plume encountering a fully and half seal offsetting fault, respectively. Subsequently available data indicated a half seal-offsetting fault at a distance from the injection well that implied a 20% probability of encounter for a plume sufficiently large to reach it.

Jordan, P.D.

2011-04-01T23:59:59.000Z

399

AREAS OF GROUND SUBSIDENCE DUE TO GEO-FLUID WITHDRAWAL  

E-Print Network (OSTI)

quartzite cher. : and shale). Active fault along vaieyate matrix; 335-900 m shale, siltstone and sand- atone.NW trending faults. Altered shale, miltstona, and sandstone,

Grimsrud, G. Paul

2011-01-01T23:59:59.000Z

400

Selecting and Scaling Earthquake Ground Motions for ...  

Science Conference Proceedings (OSTI)

... a) near-fault FD pulse motion with PPV and NCSV shown (Imperial Valley 1979, El ... typically 3 or more) such that, in aggregate, valleys of individual ...

2012-02-16T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the "reset" input of a R-S flip flop, while an "0" crossing detector controls the "set" input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the "reset" and "set" inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

Hughes, Wallace J. (Boston Lake, NY)

1999-01-01T23:59:59.000Z

402

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device is disclosed which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the ``reset`` input of a R-S flip flop, while an ``0`` crossing detector controls the ``set`` input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the ``reset`` and ``set`` inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations. 9 figs.

Hughes, W.J.

1999-04-06T23:59:59.000Z

403

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage to frequency converter controls the reset input of a R-S flip flop, while an 0 crossing detector controls the set input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the reset and set inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

Hughes, Wallace J.

1997-12-01T23:59:59.000Z

404

Vacuum die attach for integrated circuits  

DOE Patents (OSTI)

A thin film eutectic bond for attaching an integrated circuit die to a circuit substrate is formed by coating at least one bonding surface on the die and substrate with an alloying metal, assembling the die and substrate under compression loading, and heating the assembly to an alloying temperature in a vacuum. A very thin bond, 10 microns or less, which is substantially void free, is produced. These bonds have high reliability, good heat and electrical conduction, and high temperature tolerance. The bonds are formed in a vacuum chamber, using a positioning and loading fixture to compression load the die, and an IR lamp or other heat source. For bonding a silicon die to a silicon substrate, a gold silicon alloy bond is used. Multiple dies can be bonded simultaneously. No scrubbing is required.

Schmitt, Edward H. (Livermore, CA); Tuckerman, David B. (Livermore, CA)

1991-01-01T23:59:59.000Z

405

Vacuum die attach for integrated circuits  

DOE Patents (OSTI)

A thin film eutectic bond for attaching an integrated circuit die to a circuit substrate is formed by coating at least one bonding surface on the die and substrate with an alloying metal, assembling the die and substrate under compression loading, and heating the assembly to an alloying temperature in a vacuum. A very thin bond, 10 microns or less, which is substantially void free, is produced. These bonds have high reliability, good heat and electrical conduction, and high temperature tolerance. The bonds are formed in a vacuum chamber, using a positioning and loading fixture to compression load the die, and an IR lamp or other heat source. For bonding a silicon die to a silicon substrate, a gold silicon alloy bond is used. Multiple dies can be bonded simultaneously. No scrubbing is required. 1 figure.

Schmitt, E.H.; Tuckerman, D.B.

1991-09-10T23:59:59.000Z

406

Circuit Breaker Reference Book: Proposed Development Approach  

Science Conference Proceedings (OSTI)

Utilities have been maintaining circuit breakers reliably for many years. However, the aging breaker population and the more recent adaptation of analytical asset management techniques, coupled with a challenging business environment and a decline in available subject matter expertise, have made the task more difficult.Through more than two decades of research and development, the Electric Power Research Institute (EPRI) has amassed a large knowledge base of information on high-voltage ...

2013-12-20T23:59:59.000Z

407

Using Relays for Circuit Breaker Diagnostics  

Science Conference Proceedings (OSTI)

This report updates the ongoing investigation by the Electric Power Research Institute (EPRI) of how microprocessor based protective relays programmed with logic and measurements can monitor trip time performance of power circuit breakers and alarm for malfunctions or wear problems. The report describes the programming developed by the EPRI and American Transmission Company (ATC) project team to use existing relays to time first trips of selected breakers. ATC carried out laboratory ...

2012-12-13T23:59:59.000Z

408

Circuit Breaker Diagnostic Tests: Effectiveness Assessment  

Science Conference Proceedings (OSTI)

This report presents preliminary findings from a multiyear research initiative to improve the maintenance of high-voltage circuit breakers and maintain reliable performance with reduced costs through better selection and application of nonintrusive diagnostic tests and techniques. The initiative’s focus is to catalog available tests and techniques and to develop and apply assessment metrics to determine which provide the most useful information.The project team developed a set of ...

2013-12-22T23:59:59.000Z

409

Base drive and overlap protection circuit  

DOE Patents (OSTI)

An inverter (34) which provides power to an A. C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A. C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A. C. machine is optimized. The control circuit includes a microcomputer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). A base drive and overlap protection circuit is included to insure that both transistors of a complimentary pair are not conducting at the same time. In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).

Gritter, David J. (Southfield, MI)

1983-01-01T23:59:59.000Z

410

Application of Support Vector Machine (SVM) and Proximal Support Vector Machine (PSVM) for fault classification of monoblock centrifugal pump  

Science Conference Proceedings (OSTI)

Monoblock centrifugal pumps are widely used in a variety of applications. Defects and malfunctions (faults) of these pumps result in significant economic loss. Therefore, the pumps must be under constant monitoring. When a possible fault is detected, ... Keywords: CAV, PSVM, bearing faults, cavitation, decision trees, fault classification, fault diagnosis, impeller faults, monoblock centrifugal pumps, proximal SVM, seal faults, support vector machines, vibration signals

N. R. Sakthivel; V. Sugumaran; Binoy B. Nair

2010-12-01T23:59:59.000Z

411

A critical analysis of grounding practices for railroad tracks in electric utility stations  

Science Conference Proceedings (OSTI)

A railroad spur is often routed into a large substation or generating plant to facilitate installation of large power transformers or other large pieces of equipment and to transport fuel to the plant. Because the metal rails may transfer hazardous potentials into or out of the switchyard area during ground faults, precautions must be taken to limit the hazardous voltages. This analysis looks for common trends of voltages along railroad tracks in a controlled model of a substation grounding system during a ground fault. Current practices to limit these transferred potentials are based on crude approximations and engineering judgment. Recently developed computer programs allow a much better model of the grounding system, track and the hazardous scenarios to which a person might be subject. Several cases were used to illustrate some of the most common techniques used to limit hazardous voltages, and some of these techniques were found to be quite ineffective. Except for the cases where the tracks near the substation were removed, the potential transferred along the tracks produced several scenarios with touch and/or step voltages exceeding the tolerable limits.

Garrett, D.L.; Wallace, K.A. (Southern Co. Services, Birmingham, AL (United States))

1993-01-01T23:59:59.000Z

412

Type E: Extensional Tectonic, Fault-Controlled Resource | Open Energy  

Open Energy Info (EERE)

Type E: Extensional Tectonic, Fault-Controlled Resource Type E: Extensional Tectonic, Fault-Controlled Resource Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Type E: Extensional Tectonic, Fault-Controlled Resource Dictionary.png Type E: Extensional Tectonic, Fault-Controlled Resource: No definition has been provided for this term. Add a Definition Brophy Occurrence Models This classification scheme was developed by Brophy, as reported in Updating the Classification of Geothermal Resources.[1] Type A: Magma-heated, Dry Steam Resource Type B: Andesitic Volcanic Resource Type C: Caldera Resource Type D: Sedimentary-hosted, Volcanic-related Resource Type E: Extensional Tectonic, Fault-Controlled Resource Type F: Oceanic-ridge, Basaltic Resource Extensional-tectonic, fault-controlled resources typically result from a

413

Fault Mapping At Raft River Geothermal Area (1993) | Open Energy  

Open Energy Info (EERE)

Fault Mapping At Raft River Geothermal Area (1993) Fault Mapping At Raft River Geothermal Area (1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fault Mapping At Raft River Geothermal Area (1993) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Fault Mapping Activity Date 1993 Usefulness useful DOE-funding Unknown Exploration Basis Geologic mapping, strain and kinematic analysis Notes The mountains expose a detachment fault that separates a hanging wall of Paleozoic rocks from Proterozoic and Archean rocks of the footwall. Beneath the detachment lies a 100 to 300m-thick top-to-the-east extensional shear zone. Geologic mapping, strain and kinematic analysis, and 40Ar/39Ar thermochronology suggest that the shear zone and detachment fault had an

414

Scalable distributed consensus to support MPI fault tolerance.  

Science Conference Proceedings (OSTI)

As system sizes increase, the amount of time in which an application can run without experiencing a failure decreases. Exascale applications will need to address fault tolerance. In order to support algorithm-based fault tolerance, communication libraries will need to provide fault-tolerance features to the application. One important fault-tolerance operation is distributed consensus. This is used, for example, to collectively decide on a set of failed processes. This paper describes a scalable, distributed consensus algorithm that is used to support new MPI fault-tolerance features proposed by the MPI 3 Forum's fault-tolerance working group. The algorithm was implemented and evaluated on a 4,096-core Blue Gene/P. The implementation was able to perform a full-scale distributed consensus in 305 {mu}s and scaled logarithmically.

Buntinas, D. (Mathematics and Computer Science)

2011-01-01T23:59:59.000Z

415

Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics  

E-Print Network (OSTI)

Fault diagnosis has become a very important area of research during the last decade due to the advancement of mechanical and electrical systems in industries. The automobile is a crucial field where fault diagnosis is given a special attention. Due to the increasing complexity and newly added features in vehicles, a comprehensive study has to be performed in order to achieve an appropriate diagnosis model. A diagnosis system is capable of identifying the faults of a system by investigating the observable effects (or symptoms). The system categorizes the fault into a diagnosis class and identifies a probable cause based on the supplied fault symptoms. Fault categorization and identification are done using similarity matching techniques. The development of diagnosis classes is done by making use of previous experience, knowledge or information within an application area. The necessary information used may come from several sources of knowledge, such as from system analysis. In this paper similarity matching tec...

Kabir, Mashud

2009-01-01T23:59:59.000Z

416

Active Faulting in the Coso Geothermal Field, Eastern California | Open  

Open Energy Info (EERE)

Faulting in the Coso Geothermal Field, Eastern California Faulting in the Coso Geothermal Field, Eastern California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Active Faulting in the Coso Geothermal Field, Eastern California Details Activities (1) Areas (1) Regions (0) Abstract: New mapping documents a series of late Quaternary NNE-striking normal faults in the central Coso Range that dip northwest, toward and into the main production area of the Coso geothermal field. The faults exhibit geomorphic features characteristic of Holocene activity, and locally are associated with fumaroles and hydothermal alteration. The active faults sole into or terminate against the brittle-ductile transition zone (BDT) at a depth of about 4 to 5 km. The BDT is arched upward over a volume of crust

417

Enhancing and Testing Fast Fault Screening (FFS) Methodology  

Science Conference Proceedings (OSTI)

The aim of this multi-year study is to develop a methodology for fast prediction of the most severe three-phase fault locations for transient stability studies and rank them in order of severity. The methodology is called Fast Fault Screening (FFS).  The key advantage of the FFS is the ability to quickly scan through thousands of potential fault locations from transient stability perspective and identify the most severe locations. In the previous efforts, FFS was developed for angular ...

2012-12-31T23:59:59.000Z

418

Impact of Wind Power Integration on Fault Current Management  

Science Conference Proceedings (OSTI)

This report presents a study on the impact of wind power integration on the grid fault current level due to various types of faults that might take place inside or outside of wind farms. Wind power is one of the renewable energy sources that has shown tremendous growth in recent years. The increasing integration of wind energy generation and other distributed renewable energy generation could change grid behavior under fault situations and influence system stability. Specifically, integration of addition...

2010-01-14T23:59:59.000Z

419

Timer-based composition of fault-containing self-stabilizing protocols  

Science Conference Proceedings (OSTI)

One of the desired properties of distributed systems is self-adaptability against faults. Self-stabilizing protocols provide autonomous recovery from any finite number of transient faults. However, in practice, catastrophic faults rarely occur, while ... Keywords: Distributed system, Fault tolerance, Fault-containment, Hierarchical composition, Self-adaptability, Self-stabilization, Synchronizer, Timer

Yukiko Yamauchi; Sayaka Kamei; Fukuhito Ooshita; Yoshiaki Katayama; Hirotsugu Kakugawa; Toshimitsu Masuzawa

2010-05-01T23:59:59.000Z

420

Universal programmable quantum circuit schemes to emulate an operator  

Science Conference Proceedings (OSTI)

Unlike fixed designs, programmable circuit designs support an infinite number of operators. The functionality of a programmable circuit can be altered by simply changing the angle values of the rotation gates in the circuit. Here, we present a new quantum circuit design technique resulting in two general programmable circuit schemes. The circuit schemes can be used to simulate any given operator by setting the angle values in the circuit. This provides a fixed circuit design whose angles are determined from the elements of the given matrix-which can be non-unitary-in an efficient way. We also give both the classical and quantum complexity analysis for these circuits and show that the circuits require a few classical computations. For the electronic structure simulation on a quantum computer, one has to perform the following steps: prepare the initial wave function of the system; present the evolution operator U=e{sup -iHt} for a given atomic and molecular Hamiltonian H in terms of quantum gates array and apply the phase estimation algorithm to find the energy eigenvalues. Thus, in the circuit model of quantum computing for quantum chemistry, a crucial step is presenting the evolution operator for the atomic and molecular Hamiltonians in terms of quantum gate arrays. Since the presented circuit designs are independent from the matrix decomposition techniques and the global optimization processes used to find quantum circuits for a given operator, high accuracy simulations can be done for the unitary propagators of molecular Hamiltonians on quantum computers. As an example, we show how to build the circuit design for the hydrogen molecule.

Daskin, Anmer; Grama, Ananth; Kollias, Giorgos [Department of Computer Science, Purdue University, West Lafayette, Indiana 47907 (United States); Kais, Sabre [Department of Chemistry, Department of Physics and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Qatar Environment and Energy Research Institute, Doha (Qatar)

2012-12-21T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Historic Surface Faulting and Paleoseismicity in the Area of...  

Open Energy Info (EERE)

Historic Surface Faulting and Paleoseismicity in the Area of the 1954 Rainbow Mountain-Stillwater Earthquake Sequence, Central Nevada Jump to: navigation, search OpenEI Reference...

422

Low-cost motor drive embedded fault diagnosis systems  

E-Print Network (OSTI)

Electric motors are used widely in industrial manufacturing plants. Bearing faults, insulation faults, and rotor faults are the major causes of electric motor failures. Based on the line current analysis, this dissertation mainly deals with the low cost incipient fault detection of inverter-fed driven motors. Basically, low order inverter harmonics contributions to fault diagnosis, a motor drive embedded condition monitoring method, analysis of motor fault signatures in noisy line current, and a few specific applications of proposed methods are studied in detail. First, the effects of inverter harmonics on motor current fault signatures are analyzed in detail. The introduced fault signatures due to harmonics provide additional information about the motor faults and enhance the reliability of fault decisions. It is theoretically and experimentally shown that the extended fault signatures caused by the inverter harmonics are similar and comparable to those generated by the fundamental harmonic on the line current. In the next chapter, the reference frame theory is proposed as a powerful toolbox to find the exact magnitude and phase quantities of specific fault signatures in real time. The faulty motors are experimentally tested both offline, using data acquisition system, and online, employing the TMS320F2812 DSP to prove the effectiveness of the proposed tool. In addition to reference frame theory, another digital signal processor (DSP)-based phasesensitive motor fault signature detection is presented in the following chapter. This method has a powerful line current noise suppression capability while detecting the fault signatures. It is experimentally shown that the proposed method can determine the normalized magnitude and phase information of the fault signatures even in the presence of significant noise. Finally, a signal processing based fault diagnosis scheme for on-board diagnosis of rotor asymmetry at start-up and idle mode is presented. It is quite challenging to obtain these regular test conditions for long enough time during daily vehicle operations. In addition, automobile vibrations cause a non-uniform air-gap motor operation which directly affects the inductances of electric motor and results quite noisy current spectrum. The proposed method overcomes the challenges like aforementioned ones simply by testing the rotor asymmetry at zero speed.

Akin, Bilal

2007-08-01T23:59:59.000Z

423

Upper crustal faulting in an obliquely extending orogen, structural...  

Open Energy Info (EERE)

faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Jump to: navigation, search...

424

Dynamic analysis and fault diagnosis of a water hydraulic motor.  

E-Print Network (OSTI)

??This research is concerned with condition monitoring and fault diagnosis of the piston of the water hydraulic motor by vibration signal analysis. Vibration signatures are… (more)

Chen, Hanxin.

2008-01-01T23:59:59.000Z

425

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION...  

Open Energy Info (EERE)

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home...

426

Thermal Waters Along The Konocti Bay Fault Zone, Lake County...  

Open Energy Info (EERE)

Thermal Waters Along The Konocti Bay Fault Zone, Lake County, California- A Re-Evaluation Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Thermal...

427

Fault Detection and Diagnosis in Building HVAC Systems  

E-Print Network (OSTI)

diagnostic method for vapor compression air conditioners”,evaluation of faults in vapor compression cycle equipment”,Diagnostic Methods to Vapor Compression Cooling Equipment“,

Najafi, Massieh

2010-01-01T23:59:59.000Z

428

Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below...  

Open Energy Info (EERE)

Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below the Dixie Valley Geothermal Area, Nevada, Inferred from 3d Magnetotelluric Surveying Jump to: navigation, search...

429

CiFTS : Coordinated Infrastructure for Fault Tolerant Systems  

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

Demos Team News Contact Us Coordinated and Improved Fault Tolerance for High Performance Computing Systems In the next few years SciDAC applications will utilize exascale...

430

Petri net modeling of fault analysis for probabilistic risk assessment.  

E-Print Network (OSTI)

??Fault trees and event trees have been widely accepted as the modeling strategy to perform Probabilistic Risk Assessment (PRA). However, there are several limitations associated… (more)

Lee, Andrew

2013-01-01T23:59:59.000Z

431

Cryptic Faulting and Multi-Scale Geothermal Fluid Connections...  

Open Energy Info (EERE)

Cryptic Faulting and Multi-Scale Geothermal Fluid Connections in the Dixie Valley-Central Nevada Seismic Belt Area- Implications from Mt Resistivity Surveying Jump to: navigation,...

432

Recency Of Faulting And Neotechtonic Framework In The Dixie Valley...  

Open Energy Info (EERE)

Recency Of Faulting And Neotechtonic Framework In The Dixie Valley Geothermal Field And Other Geothermal Fields Of The Basin And Range Jump to: navigation, search GEOTHERMAL...

433

An Assessment of Fault Current Limiter Testing Requirements ...  

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

Energy Reliability (OE) is conducting research and development (R&D) on next-generation electricity delivery equipment including fault current limiters (FCLs). Prototype FCL...

434

Recurrent faulting and petroleum accumulation, Cat Creek Anticline, central Montana  

SciTech Connect

The Cat Creek anticline, scene of central Montana's first significant oil discovery, is underlain by a south-dipping high-angle fault (Cat Creek fault) that has undergone several episodes of movement with opposite sense of displacement. Borehole data suggest that the Cat Creek fault originated as a normal fault during Proterozoic rifting concurrent with deposition of the Belt Supergroup. Reverse faulting took place in Late Cambrian time, and again near the end of the Devonian Period. The Devonian episode, coeval with the Antler orogeny, raised the southern block several hundred feet. The southern block remained high through Meramecian time, then began to subside. Post-Atokan, pre-Middle Jurassic normal faulting lowered the southern block as much as 1,500 ft. During the Laramide orogeny (latest Cretaceous-Eocene) the Cat Creek fault underwent as much as 4,000 ft of reverse displacement and a comparable amount of left-lateral displacement. The Cat Creek anticline is a fault-propagation fold; en echelon domes and listric normal faults developed along its crest in response to wrenching. Oil was generated mainly in organic-rich shales of the Heath Formation (upper Chesterian Series) and migrated upward along tectonic fractures into Pennsylvanian, Jurassic, and Cretaceous reservoir rocks in structural traps in en echelon domes. Production has been achieved only from those domes where structural closure was retained from Jurassic through Holocene time.

Nelson, W.J. (Illinois State Geological Survey, Champaign (United States))

1991-06-01T23:59:59.000Z

435

Recent earthquake sequences at Coso: Evidence for conjugate faulting...  

Open Energy Info (EERE)

Recent earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal...

436

Alternative Materials for Ground Electrodes  

Science Conference Proceedings (OSTI)

Power utility companies struggle with issues resulting from copper theftespecially on transmission line support structures accessible to the public and fitted with copper grounding conductors. It is increasingly important to identify alternative materials that can be used to provide a durable grounding system yet not be targeted for theft. In response, EPRI is investigating the use of alternative materials for electrode designsexamining life expectancy, corrosion, material compatibility and current handl...

2010-12-23T23:59:59.000Z

437

Fault Prediction and Fault-Tolerant of Lithium-ion Batteries Temperature Failure for Electric Vehicle  

Science Conference Proceedings (OSTI)

Design and implementation of dual-redundancy was developed to predict Lithium-ion battery failure for electric vehicle. Data fusion unit, prediction unit and determination unit were designed. Outputs from original and redundant sensors were integrated ... Keywords: Lithium-ion battery, dual-redundancy, data fusion, prediction, Fault-tolerant

Hu Chunhua; He Ren; Wang Runcai; Yu Jianbo

2012-07-01T23:59:59.000Z

438

Circuit breaker operation and potential failure modes during an earthquake  

Science Conference Proceedings (OSTI)

This study addresses the effect of a strong-motion earthquake on circuit breaker operation. It focuses on the loss of offsite power (LOSP) transient caused by a strong-motion earthquake at the Zion Nuclear Power Plant. This paper also describes the operator action necessary to prevent core melt if the above circuit breaker failure modes occur simultaneously on three 4.16 KV buses. Numerous circuit breakers important to plant safety, such as circuit breakers to diesel generators and engineered safety systems (ESS), must open and/or close during this transient while strong motion is occurring. Potential seismically-induced circuit-breaker failures modes were uncovered while the study was conducted. These failure modes include: circuit breaker fails to close; circuit breaker trips inadvertently; circuit breaker fails to reclose after trip. The causes of these failure modes include: Relay chatter causes the circuit breaker to trip; Relay chatter causes anti-pumping relays to seal-in which prevents automatic closure of circuit breakers; Load sequencer failures. The incorporation of these failure modes as well as other instrumentation and control failures into a limited scope seismic probabilistic risk assessment is also discussed in this paper.

Lambert, H.E.; Budnitz, R.J.

1987-01-01T23:59:59.000Z

439

High efficiency inverter and ballast circuits  

SciTech Connect

A high efficiency push-pull inverter circuit employing a pair of relatively high power switching transistors is described. The switching on and off of the transistors is precisely controlled to minimize power losses due to common-mode conduction or due to transient conditions that occur in the process of turning a transistor on or off. Two current feed-back transformers are employed in the transistor base drives; one being saturable for providing a positive feedback, and the other being non-saturable for providing a subtractive feedback.

Nilssen, O.K.

1984-02-07T23:59:59.000Z

440

Circuit Breaker Maintenance; Volume 1: Low-Voltage Circuit Breakers; Part 2: GE AK Models: Volume 1: Low-Voltage Circuit Breakers Pa rt 2: GE AK Models  

Science Conference Proceedings (OSTI)

This comprehensive guide will help utilities improve their maintenance of GE model AK circuit breakers. It consolidates industry guidelines, applicable standards, original equipment manufacturer recommendations, and hands-on experience relative to these circuit breakers. Ultimately, improved maintenance will increase reliability and reduce costs associated with corrective maintenance and equipment downtime.

1992-05-02T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Structural geology of Shawneetown fault zone, Southeastern Illinois  

SciTech Connect

Vertical movements of crustal blocks along the narrow east-west-trending Shawneetown fault zone in southeastern Illinois occurred between Early Permian and Late Cretaceous. The main blocks moved vertically and retured to roughly their orignal positions so that strata now show little relative offset across the fault zone. However, individual faults with displacements up to 3,500 ft (1,070 m) bound narrow slices of steeply tilted or overturned strata resulting in a juxtaposition of Kinderhookian (Lower Mississippian) and Upper Devonian strata with Lower Pennsylvanina strata. The bedrock is intensely fractured, commonly brecciated, and cemented with either silica or calcite. Slickensides and mullion display various orientations within the zone and on individual outcrops. The dominant movement, however, appears to be vertical with no evidence for significant strike-slip movements. Pleistocene deposits do not exhibit offsets across the fault zone, indicating that no tectonic activity has occurred since the beginning of that epoch. The trend of the fault zone changes abruptly from east-west in southern Gallatin and easternmost Saline Counties to south-southwest in southern Saline and northeastern Pope Counties, where it joins the Fluorspar area fault complex. Here the zone widens and develops a braided pattern as the amount of displacement along individual faults decreases. The Shawneetown fault zone and Flourspar area fault complex in part are younger than the Cottage Grove fault system to the northwest and the Wabash Valley fault system to the north. The hope of finding structural traps near the junctions of the fuel systems has spurred recent oil exploration in the area.

Lumm, D.K.; Nelson, W.J.

1983-09-01T23:59:59.000Z

442

Colorado Ground Water Commission | Open Energy Information  

Open Energy Info (EERE)

Water Commission Jump to: navigation, search Name Colorado Ground Water Commission Place Colorado Website http:water.state.co.usgroun References Colorado Ground Water Commission...

443

Automating Power System Fault Diagnosis through Multi-Agent System Technology  

Science Conference Proceedings (OSTI)

Fault diagnosis within electrical power systems is a time consuming and complex task. SCADA systems, digital fault recorders, travelling wave fault locators and other monitoring devices are drawn upon to inform the engineers of incidents, problems and ...

S. D. J. McArthur; E. M. Davidson; J. A. Hossack; J. R. McDonald

2004-01-01T23:59:59.000Z

444

Feng shui of supercomputer memory: positional effects in DRAM and SRAM faults  

Science Conference Proceedings (OSTI)

Several recent publications confirm that faults are common in high-performance computing systems. Therefore, further attention to the faults experienced by such computing systems is warranted. In this paper, we present a study of DRAM and SRAM faults ...

Vilas Sridharan, Jon Stearley, Nathan DeBardeleben, Sean Blanchard, Sudhanva Gurumurthi

2013-11-01T23:59:59.000Z

445

Circuit Breaker Maintenance: Volume 2: Medium Voltage Circuit Breakers; Part 3: Westinghouse Types DH and DHP  

Science Conference Proceedings (OSTI)

This comprehensive guide will help utilities enhance and optimize maintenance of Westinghouse DH and DHP circuit breakers. It consolidates industry guidelines, applicable standards, original equipment manufacturer recommendations, and hands-on experience relative to these breakers. Optimized maintenance will increase reliability and reduce costs associated with corrective maintenance and equipment downtime.

1994-02-02T23:59:59.000Z

446

Seismic fragility formulations for segmented buried pipeline systems including the impact of differential ground subsidence  

Science Conference Proceedings (OSTI)

Though Differential Ground Subsidence (DGS) impacts the seismic response of segmented buried pipelines augmenting their vulnerability, fragility formulations to estimate repair rates under such condition are not available in the literature. Physical models to estimate pipeline seismic damage considering other cases of permanent ground subsidence (e.g. faulting, tectonic uplift, liquefaction, and landslides) have been extensively reported, not being the case of DGS. The refinement of the study of two important phenomena in Mexico City - the 1985 Michoacan earthquake scenario and the sinking of the city due to ground subsidence - has contributed to the analysis of the interrelation of pipeline damage, ground motion intensity, and DGS; from the analysis of the 48-inch pipeline network of the Mexico City's Water System, fragility formulations for segmented buried pipeline systems for two DGS levels are proposed. The novel parameter PGV{sup 2}/PGA, being PGV peak ground velocity and PGA peak ground acceleration, has been used as seismic parameter in these formulations, since it has shown better correlation to pipeline damage than PGV alone according to previous studies. By comparing the proposed fragilities, it is concluded that a change in the DGS level (from Low-Medium to High) could increase the pipeline repair rates (number of repairs per kilometer) by factors ranging from 1.3 to 2.0; being the higher the seismic intensity the lower the factor.

Pineda Porras, Omar Andrey [Los Alamos National Laboratory; Ordaz, Mario [UNAM, MEXICO CITY

2009-01-01T23:59:59.000Z

447

Interrogator system for identifying electrical circuits  

DOE Patents (OSTI)

A system for interrogating electrical leads to correctly ascertain the identity of equipment attached to remote ends of the leads. The system includes a source of a carrier signal generated in a controller/receiver to be sent over the leads and an identifier unit at the equipment. The identifier is activated by command of the carrier and uses a portion of the carrier to produce a supply voltage. Each identifier is uniquely programmed for a specific piece of equipment, and causes the impedance of the circuit to be modified whereby the carrier signal is modulated according to that program. The modulation can be amplitude, frequency or phase modulation. A demodulator in the controller/receiver analyzes the modulated carrier signal, and if a verified signal is recognized displays and/or records the information. This information can be utilized in a computer system to prepare a wiring diagram of the electrical equipment attached to specific leads. Specific circuit values are given for amplitude modulation, and the system is particularly described for use with thermocouples.

Jatko, William B. (10601 Rivermist La., Knoxville, TN 37922); McNeilly, David R. (Rte. 12, Box 538, Maryville, TN 37801)

1988-01-01T23:59:59.000Z

448

Interrogator system for identifying electrical circuits  

DOE Patents (OSTI)

A system for interrogating electrical leads to correctly ascertain the identity of equipment attached to remote ends of the leads is disclosed. The system includes a source of a carrier signal generated in a controller/receiver to be sent over the leads and an identifier unit at the equipment. The identifier is activated by command of the carrier and uses a portion of the carrier to produce a supply voltage. Each identifier is uniquely programmed for a specific piece of equipment, and causes the impedance of the circuit to be modified whereby the carrier signal is modulated according to that program. The modulation can be amplitude, frequency or phase modulation. A demodulator in the controller/receiver analyzes the modulated carrier signal, and if a verified signal is recognized displays and/or records the information. This information can be utilized in a computer system to prepare a wiring diagram of the electrical equipment attached to specific leads. Specific circuit values are given for amplitude modulation, and the system is particularly described for use with thermocouples. 6 figs.

Jatko, W.B.; McNeilly, D.R.

1988-04-12T23:59:59.000Z

449

Generating Single Microwave Photons in a Circuit  

E-Print Network (OSTI)

Electromagnetic signals in circuits consist of discrete photons, though conventional voltage sources can only generate classical fields with a coherent superposition of many different photon numbers. While these classical signals can control and measure bits in a quantum computer (qubits), single photons can carry quantum information, enabling non-local quantum interactions, an important resource for scalable quantum computing. Here, we demonstrate an on-chip single photon source in a circuit quantum electrodynamics (QED) architecture, with a microwave transmission line cavity that collects the spontaneous emission of a single superconducting qubit with high efficiency. The photon source is triggered by a qubit rotation, as a photon is generated only when the qubit is excited. Tomography of both qubit and fluorescence photon shows that arbitrary qubit states can be mapped onto the photon state, demonstrating an ability to convert a stationary qubit into a flying qubit. Both the average power and voltage of the photon source are characterized to verify performance of the system. This single photon source is an important addition to a rapidly growing toolbox for quantum optics on a chip.

A. A. Houck; D. I. Schuster; J. M. Gambetta; J. A. Schreier; B. R. Johnson; J. M. Chow; J. Majer; L. Frunzio; M. H. Devoret; S. M. Girvin; R. J. Schoelkopf

2007-02-27T23:59:59.000Z

450

Hydraulic actuator for an electric circuit breaker  

DOE Patents (OSTI)

This actuator comprises a fluid motor having a piston, a breaker-opening space at one side of the piston, and a breaker-closing space at its opposite side. An accumulator freely communicates with the breaker-opening space for supplying pressurized fluid thereto during a circuit breaker opening operation. The breaker-opening space and the breaker-closing space are connected by an impeded flow passage. A pilot valve opens to allow the pressurized liquid in the breaker-closing space to flow to a back chamber of a normally closed main valve to cause the main valve to be opened during a circuit breaker opening operation to release the pressurized liquid from the breaker-closing space. An impeded passage affords communication between the back chamber and a sump located on the opposite side of the main valve from the back chamber. The pilot valve and impeded passage allow rapid opening of the main valve with pressurized liquid from the breaker closing side of the piston. 3 figs.

Imam, I.

1983-05-17T23:59:59.000Z

451

Hydraulic actuator for an electric circuit breaker  

DOE Patents (OSTI)

This actuator comprises a fluid motor having a piston, a breaker-opening space at one side of the piston, and a breaker-closing space at its opposite side. An accumulator freely communicates with the breaker-opening space for supplying pressurized fluid thereto during a circuit breaker opening operation. The breaker-opening space and the breaker-closing space are connected by an impeded flow passage. A pilot valve opens to allow the pressurized liquid in the breaker-closing space to flow to a back chamber of a normally closed main valve to cause the main valve to be opened during a circuit breaker opening operation to release the pressurized liquid from the breaker-closing space. An impeded passage affords communication between the back chamber and a sump located on the opposite side of the main valve from the back chamber. The pilot valve and impeded passage allow rapid opening of the main valve with pressurized liquid from the breaker closing side of the piston.

Imam, Imdad (Colonie, NY)

1983-01-01T23:59:59.000Z

452

Transient analysis of grounding systems  

SciTech Connect

This paper addresses the problem of computing the ground potential rise of grounding systems during transients. Finite element analysis is employed to model the constituent parts of a grounding system. Short lengths of earth embedded electrodes are characterized as transmission lines with distributed inductance, capacitance and leakage resistance to earth. Leakage resistance to earth is accurately computed with the method of moments. The other parameters of the finite element, namely inductance and capacitance, are computed from the resistance utilizing Maxwell's equations. This modeling enables the computation of the transient response of substation grounding systems to fast or slow waves striking the substation. The result is obtained in terms of a convolution of the step response of the system and the striking wave. In this way the impedance of substation systems to 60 cycles is accurately computed. Results demonstrate the dependence of the 60 cycle impedance on system parameters. The methodology allows to interface this model of a substation ground mat with the Electromagnetic Transient Analysis Program thus, allowing explicit representation of earth effects in electromagmatic transients computations.

Meliopoulos, A.P.; Moharam, M.G.

1983-02-01T23:59:59.000Z

453

First step towards automatic correction of firewall policy faults  

Science Conference Proceedings (OSTI)

Firewalls are critical components of network security and have been widely deployed for protecting private networks. A firewall determines whether to accept or discard a packet that passes through it based on its policy. However, most real-life firewalls ... Keywords: Automatic fault fixing, firewall faults, firewall policy

Fei Chen; Alex X. Liu; Jeehyun Hwang; Tao Xie

2012-07-01T23:59:59.000Z

454

Fault Diagnosis of Transformer Based on Random Forest  

Science Conference Proceedings (OSTI)

Fault diagnosis of transformer in power system is studied in this paper. Considering the excellent performances of Random Forest (RF) in pattern recognition, we apply RF to construct a diagnosis model to predict the situation of transformer. The experiments ... Keywords: Rondom Forest, fault diagnosis of transformer, classification model

Xi Chen; Hongmei Cui; Linkai Luo

2011-03-01T23:59:59.000Z

455

ANFIS based sensor fault detection for continuous stirred tank reactor  

Science Conference Proceedings (OSTI)

In this paper, an Adaptive Neuro-Fuzzy Inference System (ANFIS) based Sensor fault detection and isolation for Continuous Stirred Tank Reactor (CSTR) is proposed. CSTR is a highly nonlinear process exhibiting stable and unstable steady state at different ... Keywords: ANFIS observer, Continuous stirred tank reactor, Dedicated observer, Fault detection

U. Sabura Banu; G. Uma

2011-03-01T23:59:59.000Z

456

Increasing fault-tolerance in cellular automata-based systems  

Science Conference Proceedings (OSTI)

In the light of emergence of cellular computing, new cellular computing systems based on yet-unknown methods of fabrication need to address the problem of fault tolerance in a way which is not tightly connected to used technology. This may not be possible ... Keywords: Byl's loop, Game of Life, TMR, cellular automata, cellular computing, fault tolerance, rule 30, static module redundance

Lud?k Žaloudek; Lukáš Sekanina

2011-06-01T23:59:59.000Z

457

Symbolic identification for fault detection in aircraft gas turbine engines  

E-Print Network (OSTI)

Symbolic identification for fault detection in aircraft gas turbine engines S Chakraborty, S Sarkar and computationally inexpensive technique of component-level fault detection in aircraft gas-turbine engines identification, gas turbine engines, language-theoretic analysis 1 INTRODUCTION The propulsion system of modern

Ray, Asok

458

CUDA accelerated fault tree analysis with C-XSC  

Science Conference Proceedings (OSTI)

Fault tree analysis is a widespread mathematical method for determining the failure probability of observed real-life systems. In addition to failure probability defined by wear, the system model has to take into account intrinsic and extrinsic system ... Keywords: C-XSC, CUDA, DSI, fault tree analysis

Gabor Rebner; Michael Beer

2012-09-01T23:59:59.000Z

459

GPS satellite oscillator faults mimicking ionospheric phase scintillation  

Science Conference Proceedings (OSTI)

It is possible for unreported Global Positioning System satellite faults to cause phase variations mimicking the effect of ionospheric scintillation. A case study of an event on 17 May, 2011 is presented. For approximately 695 s, the L1 signal from the ... Keywords: Anomaly, Fault, Navstar 43, PRN 13, Scintillation, Sigma-phi

Christopher J. Benton; Cathryn N. Mitchell

2012-10-01T23:59:59.000Z

460

Towards Robustness in Neural Network Based Fault Diagnosis  

Science Conference Proceedings (OSTI)

Challenging design problems arise regularly in modern fault diagnosis systems. Unfortunately, classical analytical techniques often cannot provide acceptable solutions to such difficult tasks. This explains why soft computing techniques such as neural ... Keywords: Dynamic Neural Network, Fault Diagnosis, Gmdh Neural Network, Robustness

Krzysztof Patan; Marcin Witczak; JóZef Korbicz

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" 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

Fault detection in multivariate signals with applications to gas turbines  

Science Conference Proceedings (OSTI)

This paper proposes a fault detection method for multivariate signals. The method assesses whether or not the multivariate autocovariance functions of two independently sampled system signals coincide. If the first signal is known to be sampled from ... Keywords: autocovariances, fault detection, spectral analysis, stationary time series

Hany Bassily; Robert Lund; John Wagner

2009-03-01T23:59:59.000Z

462

COMPLETE FAULT ANALYSIS FOR LONG TRANSMISSION LINE USING  

E-Print Network (OSTI)

Plants and Power Systems Control, Kananaskis, Canada, 2006 #12;Area Measurement System (WAMS) and Phasor variables. Methods based on traveling waves and recently based on fault- generated high-frequency transients of the fault location. This method will be more attractive when the concept of Wide IFAC Symposium on Power

463

Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems  

E-Print Network (OSTI)

Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems Xue Lin 1 , Yanzhi, yanzhiwa, dizhu, pedram}@usc.edu, 2 naehyuck@elpl.snu.ac.kr ABSTRACT Photovoltaic energy harvesting systems (PV systems) are subject to PV cell faults, which decrease the efficiency of PV systems and even

Pedram, Massoud

464

Soft computing approach to fault diagnosis of centrifugal pump  

Science Conference Proceedings (OSTI)

Fault detection and isolation in rotating machinery is very important from an industrial viewpoint as it can help in maintenance activities and significantly reduce the down-time of the machine, resulting in major cost savings. Traditional methods have ... Keywords: Centrifugal pump, Decision tree algorithm, Fault diagnosis, Gene expression programming, Proximal support vector machine, Statistical features, Support vector machine

N. R. Sakthivel; Binoy.B.Nair; V. Sugumaran

2012-05-01T23:59:59.000Z

465

Effects of unbalanced faults on transient stability of cogeneration system  

Science Conference Proceedings (OSTI)

This paper evaluates the effects of unbalanced faults on the transient stability of a real cogeneration plant. First, a brief is given for the structure of the cogeneration system. Use of the electromagnetic transient program (EMTP) constructs the cogeneration ... Keywords: CCT curve, EMTP, cogeneration plant, transient stability, unbalanced faults

Wei-Neng Chang; Chia-Han Hsu

2011-10-01T23:59:59.000Z

466

Automatic Fault Characterization via Abnormality-Enhanced Classification  

Science Conference Proceedings (OSTI)

Enterprise and high-performance computing systems are growing extremely large and complex, employing hundreds to hundreds of thousands of processors and software/hardware stacks built by many people across many organizations. As the growing scale of these machines increases the frequency of faults, system complexity makes these faults difficult to detect and to diagnose. Current system management techniques, which focus primarily on efficient data access and query mechanisms, require system administrators to examine the behavior of various system services manually. Growing system complexity is making this manual process unmanageable: administrators require more effective management tools that can detect faults and help to identify their root causes. System administrators need timely notification when a fault is manifested that includes the type of fault, the time period in which it occurred and the processor on which it originated. Statistical modeling approaches can accurately characterize system behavior. However, the complex effects of system faults make these tools difficult to apply effectively. This paper investigates the application of classification and clustering algorithms to fault detection and characterization. We show experimentally that naively applying these methods achieves poor accuracy. Further, we design novel techniques that combine classification algorithms with information on the abnormality of application behavior to improve detection and characterization accuracy. Our experiments demonstrate that these techniques can detect and characterize faults with 65% accuracy, compared to just 5% accuracy for naive approaches.

Bronevetsky, G; Laguna, I; de Supinski, B R

2010-12-20T23:59:59.000Z

467

Memristor-based Circuits for Performing Basic Arithmetic Operations  

E-Print Network (OSTI)

In almost all of the currently working circuits, especially in analog circuits implementing signal processing applications, basic arithmetic operations such as multiplication, addition, subtraction and division are performed on values which are represented by voltages or currents. However, in this paper, we propose a new and simple method for performing analog arithmetic operations which in this scheme, signals are represented and stored through a memristance of the newly found circuit element, i.e. memristor, instead of voltage or current. Some of these operators such as divider and multiplier are much simpler and faster than their equivalent voltage-based circuits and they require less chip area. In addition, a new circuit is designed for programming the memristance of the memristor with predetermined analog value. Presented simulation results demonstrate the effectiveness and the accuracy of the proposed circuits.

Merrikh-Bayat, Farnood

2010-01-01T23:59:59.000Z

468

Dating of major normal fault systems using thermochronology- An example  

Open Energy Info (EERE)

Dating of major normal fault systems using thermochronology- An example Dating of major normal fault systems using thermochronology- An example from the Raft River detachment, Basin and Range, western United States Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Dating of major normal fault systems using thermochronology- An example from the Raft River detachment, Basin and Range, western United States Details Activities (1) Areas (1) Regions (0) Abstract: Application of thermochronological techniques to major normal fault systems can resolve the timing of initiation and duration of extension, rates of motion on detachment faults, timing of ductile mylonite formation and passage of rocks through the crystal-plastic to brittle transition, and multiple events of extensional unroofing. Here we determine

469

Recent earthquake sequences at Coso: Evidence for conjugate faulting and  

Open Energy Info (EERE)

earthquake sequences at Coso: Evidence for conjugate faulting and earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Recent earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Details Activities (1) Areas (1) Regions (0) Abstract: Two recent earthquake sequences near the Coso geothermal field show clear evidence of faulting along conjugate planes. We present results from analyzing an earthquake sequence occurring in 1998 and compare it with a similar sequence that occurred in 1996. The two sequences followed mainshocks that occurred on 27 November 1996 and 6 March 1998. Both mainshocks ruptured approximately colocated regions of the same fault

470

Definition: Apex or Salient of Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Apex or Salient of Normal Fault Jump to: navigation, search Dictionary.png Apex or Salient of Normal Fault Normal faults may intersect in the subsurface to form a fault apex or salient. Apices or salients of normal faults account for 3% of structural controls in the Great Basin.[2] View on Wikipedia Wikipedia Definition References ↑ James E. Faulds,Nicholas H. Hinz,Mark F. Coolbaugh,Patricia H. Cashman,Christopher Kratt,Gregory Dering,Joel Edwards,Brett Mayhew,Holly McLachlan. 2011. Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA. In: Transactions. GRC Anual Meeting; 2011/10/23; San Diego, CA. Davis, CA: Geothermal Resources Council; p. 777-783

471

Field Guide: Compressors for High-Voltage Circuit Breakers  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breakers have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may misoperate or fail, possibly resulting in equipment damage or an outageboth expensive consequences. To help utilities prevent such undesirable events, this field gu...

2010-12-22T23:59:59.000Z

472

Field Guide: Compressors for High-Voltage Circuit Breakers  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breakers have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may misoperate or fail, possibly resulting in equipment damage or an outage—both expensive consequences. To help ...

2012-12-14T23:59:59.000Z

473

Probability Estimation of CO2 Leakage Through Faults at Geologic Carbon Sequestration Sites  

E-Print Network (OSTI)

for Geologic Carbon Sequestration Based on EffectiveFaults at Geologic Carbon Sequestration Sites Yingqi Zhang*,faults at geologic carbon sequestration (GCS) sites is a

Zhang, Yingqi

2009-01-01T23:59:59.000Z

474

Fault Analysis at a Wind Power Plant for One Year of Observation: Preprint  

DOE Green Energy (OSTI)

This paper analyzes the fault characteristics observed at a wind power plant, and the behavior of the wind power plant under fault events.

Muljadi, E.; Mills, Z.; Foster, R.; Conto, J.; Ellis, A.

2008-07-01T23:59:59.000Z

475

A Power-efficient Radio Frequency Energy-harvesting Circuit .  

E-Print Network (OSTI)

??This work aims to demonstrate the design and simulation of a Radio Frequency (RF) energy-harvesting circuit, from receiving antenna to the point of charge collection.… (more)

Khoury, Philip

2013-01-01T23:59:59.000Z

476

DSOPilot project Automatic receipt of short circuiting indicators...  

Open Energy Info (EERE)

Project Name DSOPilot project Automatic receipt of short circuiting indicators Country Denmark Coordinates 56.26392, 9.501785 Loading map... "minzoom":false,"mappingservice":"...

477

Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical ...  

Science Conference Proceedings (OSTI)

Presentation Title, Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical .... Selective Separations of Gold and Contaminants from Various Gold and ...

478

Hydrocyclone Classification Modeling for Gold Ore Grinding Circuit ...  

Science Conference Proceedings (OSTI)

Grinding is achieved in closed circuits where hydrocyclones are used to .... Selective Separations of Gold and Contaminants from Various Gold and Silver ...

479

Driver Circuit for White LED Lamps with TRIAC Dimming Control.  

E-Print Network (OSTI)

??An efficient Light Emitting Diode (LED) lamp driver circuit is proposed for retrofitting the conventionally used incandescent lamps with existing TRIAC dimmer. The dimming feature… (more)

Weng, Szu-Jung

2012-01-01T23:59:59.000Z

480

Automatic ranging circuit for a digital panel meter  

DOE Patents (OSTI)

This invention relates to a range changing circuit that operates in conjunction with a digital panel meter of fixed sensitivity. The circuit decodes the output of the panel meter and uses that information to change the gain of an input amplifier to the panel meter in order to insure that the maximum number of significant figures is always displayed in the meter. The circuit monitors five conditions in the meter and responds to any of four combinations of these conditions by means of logic elements to carry out the function of the circuit.

Mueller, Theodore R. (Oak Ridge, TN); Ross, Harley H. (Oak Ridge, TN)

1976-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground fault circuit" from the National Library of EnergyBeta (NLEBeta).
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481

Phase controlled rectifier circuit for rapidly charging batteries  

SciTech Connect

An improved battery charger circuit for rapidly charging a battery by increasing the rate of battery charge acceptance through periodic battery discharge during the charging process includes a pair of first and second controlled rectifier circuits coupled to an ac source and adapted for coupling to a battery. The first controlled rectifier circuit is rendered conductive during the charging intervals to supply the battery with charge current from the ac source. The second controlled rectifier circuit is rendered conductive during battery discharge intervals to discharge the battery in a substantially lossless manner by conducting battery discharge current through the ac source, thus realizing a highly efficient battery charger.

Steigerwald, R. L.

1981-02-24T23:59:59.000Z

482

Laser Micromachining of Active and Passive Photonic Integrated Circuits  

E-Print Network (OSTI)

This thesis describes the development of advanced laser resonators and applications of laserinduced micromachining for photonic circuit fabrication. Two major advantages of laserinduced micromachining are direct patterning ...

Cho, Seong-Ho

2006-06-28T23:59:59.000Z

483

Safety and performance enhancement circuit for primary explosive detonators  

DOE Patents (OSTI)

A safety and performance enhancement arrangement for primary explosive detonators. This arrangement involves a circuit containing an energy storage capacitor and preset self-trigger to protect the primary explosive detonator from electrostatic discharge (ESD). The circuit does not discharge into the detonator until a sufficient level of charge is acquired on the capacitor. The circuit parameters are designed so that normal ESD environments cannot charge the protection circuit to a level to achieve discharge. When functioned, the performance of the detonator is also improved because of the close coupling of the stored energy.

Davis, Ronald W. (Tracy, CA)

2006-04-04T23:59:59.000Z

484

6.012 Microelectronic Devices and Circuits, Fall 2003  

E-Print Network (OSTI)

Modeling of microelectronic devices, and basic microelectronic circuit analysis and design. Physical electronics of semiconductor junction and MOS devices. Relation of electrical behavior to internal physical processes; ...

Fonstad, Clifton G.

485

Surge Protection in Low-Voltage AC Power Circuits  

Science Conference Proceedings (OSTI)

Surge Protection in Low-Voltage AC Power Circuits: An 8-part Anthology ... converting old and yellowing papers into 21st Century electronic files, and ...

2013-05-20T23:59:59.000Z

486

Ground Truth: A Positive Cloud-to-Ground Lightning Flash  

Science Conference Proceedings (OSTI)

We describe the circumstances and effects of a cloud-to-ground lightning flash that lowered positive charge and struck a residential home near Albany, New York. The characteristics of the flash were detected and recorded by a wide-band magnetic ...

Vincent P. Idone; Richard E. Orville; Ronald W. Henderson

1984-07-01T23:59:59.000Z

487