Adaptive sequential controller

Details Adaptive sequential controller Adaptive sequential controller

1992-10-20

1994-11-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 2, 361 85, H02H 300

Patent

active

053611845

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 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.

REFERENCES:
patent: 5119260 (1992-06-01), Huhse et al.
A. Hohm, R. Alvinsson, U. Akesson, & O. Karlen, "Development of Controlled Switching of Reactors, Capacitors Transformers and Lines," Cigre, 1990 Session, 26 Aug.-1st Sep., 10 pp.
R. Alvinsson & C. Solver, "Switching to lower transients," Transmission & Distribution, Mar. 1991, pp. 41, 43, & 45.
R. Alexander, "Synchronous Closing Control for Shunt Capacitors," 1985 IEEE, 85 WM 221-7, pp. 1-7.
ABB HV Switchgear, "Switchsync Relay for synchronous circuit switching" Brochure, Publ. SESWG/B 2001 E, Edition 2, 1991-06, 4 pp.
Joslyn Hi-Voltage Corporation, VBU Faultmaster.RTM. Interrupter including Zero Voltage Closing Control Instruction Manual, D.B. 750-201, May 1986, 28 pp.
R. Wolff, "Control of capacitor closing nips surges," Electrical World, Transmission/Distribution, Jan. 1, 1979, 6 pp.
N. Witteberg, Westinghouse ABB Power T & D Company publication, "Smooth Energizing of Capacitor Banks," NESA Dristb, Aug. 1989, 12pp.

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