Adaptive sequential controller
Abstract
An adaptive sequential controller (50/50') for controlling a circuit breaker (52) or other switching device to substantially eliminate transients on a distribution line caused by closing and opening the circuit breaker. The device adaptively compensates for changes in the response time of the circuit breaker due to aging and environmental effects. A potential transformer (70) provides a reference signal corresponding to the zero crossing of the voltage waveform, and a phase shift comparator circuit (96) compares the reference signal to the time at which any transient was produced when the circuit breaker closed, producing a signal indicative of the adaptive adjustment that should be made. Similarly, in controlling the opening of the circuit breaker, a current transformer (88) provides a reference signal that is compared against the time at which any transient is detected when the circuit breaker last opened. An adaptive adjustment circuit (102) produces a compensation time that is appropriately modified to account for changes in the circuit breaker response, including the effect of ambient conditions and aging. When next opened or closed, the circuit breaker is activated at an appropriately compensated time, so that it closes when the voltage crosses zero and opens when the current crossesmore »
- Inventors:
-
- Renton, WA
- Seattle, WA
- Newberg, OR
- Pasadena, CA
- Issue Date:
- OSTI Identifier:
- 869594
- Patent Number(s):
- 5361184
- Assignee:
- Board of Regents of University of Washington (Seattle, WA)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01H - ELECTRIC SWITCHES
- DOE Contract Number:
- BI79-92BP25768
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- adaptive; sequential; controller; 50; controlling; circuit; breaker; 52; switching; device; substantially; eliminate; transients; distribution; line; caused; closing; adaptively; compensates; changes; response; time; due; aging; environmental; effects; potential; transformer; 70; provides; reference; signal; corresponding; zero; crossing; voltage; waveform; phase; shift; comparator; 96; compares; transient; produced; closed; producing; indicative; adjustment; similarly; current; 88; compared; detected; 102; produces; compensation; appropriately; modified; account; including; effect; ambient; conditions; activated; compensated; closes; crosses; minimizing; angle; control; relative; provided; voltage waveform; signal corresponding; ambient conditions; current transformer; zero crossing; phase angle; phase shift; reference signal; circuit breaker; response time; signal indicative; switching device; substantially eliminate; crosses zero; comparator circuit; sequential controller; voltage crosses; signal provide; adaptive sequential; distribution line; /361/
Citation Formats
El-Sharkawi, Mohamed A, Xing, Jian, Butler, Nicholas G, and Rodriguez, Alonso. Adaptive sequential controller. United States: N. p., 1994.
Web.
El-Sharkawi, Mohamed A, Xing, Jian, Butler, Nicholas G, & Rodriguez, Alonso. Adaptive sequential controller. United States.
El-Sharkawi, Mohamed A, Xing, Jian, Butler, Nicholas G, and Rodriguez, Alonso. Sat .
"Adaptive sequential controller". United States. https://www.osti.gov/servlets/purl/869594.
@article{osti_869594,
title = {Adaptive sequential controller},
author = {El-Sharkawi, Mohamed A and Xing, Jian and Butler, Nicholas G and Rodriguez, Alonso},
abstractNote = {An adaptive sequential controller (50/50') for controlling a circuit breaker (52) or other switching device to substantially eliminate transients on a distribution line caused by closing and opening the circuit breaker. The device adaptively compensates for changes in the response time of the circuit breaker due to aging and environmental effects. A potential transformer (70) provides a reference signal corresponding to the zero crossing of the voltage waveform, and a phase shift comparator circuit (96) compares the reference signal to the time at which any transient was produced when the circuit breaker closed, producing a signal indicative of the adaptive adjustment that should be made. Similarly, in controlling the opening of the circuit breaker, a current transformer (88) provides a reference signal that is compared against the time at which any transient is detected when the circuit breaker last opened. An adaptive adjustment circuit (102) produces a compensation time that is appropriately modified to account for changes in the circuit breaker response, including the effect of ambient conditions and aging. When next opened or closed, the circuit breaker is activated at an appropriately compensated time, so that it closes when the voltage crosses zero and opens when the current crosses zero, minimizing any transients on the distribution line. Phase angle can be used to control the opening of the circuit breaker relative to the reference signal provided by the potential transformer.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}
Works referenced in this record:
Synchronous Closing Control for Shunt Capacitors
journal, September 1985
- Alexander, R.
- IEEE Transactions on Power Apparatus and Systems, Vol. PAS-104, Issue 9