Commutation circuit for an hvdc circuit breaker

H - Electricity – 02 – H

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348/1

H02H 3/00 (2006.01) H01H 33/00 (2006.01)

Patent

CA 1153096

RD-9085 COMMUTATION CIRCUIT FOR AN HVDC CIRCUIT BREAKER ABSTRACT OF THE DISCLOSURE A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components.

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