Method for determining the time of reclosing a circuit breaker a

Details Method for determining the time of reclosing a circuit breaker a Method for determining the time of reclosing a circuit breaker a

1985-01-30

1988-02-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

324423, 361 71, 364569, G01R 3102

Patent

active

047243910

ABSTRACT:
A method for reclosing a temporarily opened circuit breaker in a manner which assures that generation of unwanted overvoltage stresses is avoided during the reclosure process. An oscillating line voltage typically develops in a shunt-compensated line after a circuit breaker connecting the line to a voltage source is opened. When the circuit breaker is reclosed the source voltage and the oscillating voltages must be properly phased to avoid the overstressing problem. In operation, the polarities of the feed voltage and the oscillating line voltage are detected and the instant when the circuit breaker may be reclosed is calculated. The periods T.sub.L and T.sub.S of the line voltage and the feed voltage are measured. Also measured is the time .DELTA.T which elapses from a zero crossing of the line voltage waveform to a subsequent zero crossing of the feed voltage waveform having the same phase angle as that of the line voltage zero crossing. The circuit breaker is reclosed upon satisfying the relationship:

REFERENCES:
patent: 4039932 (1977-08-01), Duckworth
patent: 4454476 (1984-06-01), Kobayashi et al.
patent: 4454556 (1984-06-01), De Puy
patent: 4481473 (1984-11-01), Compton
patent: 4538197 (1985-08-01), Breen

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