H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/41
H02H 7/22 (2006.01) H01H 9/54 (2006.01) H02J 3/24 (2006.01) H03K 17/723 (2006.01) H03K 17/00 (2006.01)
Patent
CA 1309487
- 29 - APPARATUS FOR REDUCING STRESSES THAT INITIATE RE-STRIKE OF BREAKERS IN DISCONNECTING OF CAPACITOR BANKS ABSTRACT OF THE INVENTION Re-strike in the circuit breaker of a capacitive load applied across an AC voltage power supply is reduced or avoided by connecting across the capacitor bank a tuned discharge circuit. The tuned discharge circuit includes a transformer with a primary connected in parallel with the capacitor bank and a secondary which can be shorted through a switch. The leakage reactance of the trans- former is equated to the capacitive reactance of the capa- citor bank so that the tuned circuit discharges the capa- citor voltage in phase with the supply voltage. The discharge takes place through a number of cycles thus gradually increasing the voltage across the breaker gap. The switch in the secondary preferably comprises an anti- parallel pair of thyristors fired by a circuit responsive to current zero in the capacitive circuit detected over a delay period to avoid firing at normal zero crossing cur- rent.
575062
Glodjo Ahmed
Maguire Trevor
Woodford Dennis
Ade & Company
Manitoba Hvdc Research Centre
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