H - Electricity – 02 – J
Patent
H - Electricity
02
J
348/18
H02J 3/42 (2006.01) H02H 3/06 (2006.01)
Patent
CA 1233228
ABSTRACT OF THE DISCLOSURE A method for reclosing a temporarily opened circuit braker in a manner which assures that generation of unwanted overvoltage stresses is avoided during the reclosure process. An oscillat- ing line voltage typically develops in a shunt-com- pensated 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 braker may be reclosed is calculated. The periods TL and TS 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: Image where m, n are natural numbers which are sequen- tially entered in the above equation.
473208
Limited Bbc Brown Boveri & Company
Ogilvy Renault
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