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Title: 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 » 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.« less

Inventors:
 [1];  [2];  [3];  [4]
  1. (Renton, WA)
  2. (Seattle, WA)
  3. (Newberg, OR)
  4. (Pasadena, CA)
Issue Date:
OSTI Identifier:
869594
Patent Number(s):
5361184
Assignee:
Board of Regents of University of Washington (Seattle, WA) BPA
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 = {1994},
month = {1}
}

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