H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/08 (2006.01) H02H 1/00 (2006.01) H02H 3/093 (2006.01)
Patent
CA 1090912
CIRCUIT BREAKER APPARATUS INCLUDING ASYMMETRICAL FAULT DETECTOR ABSTRACT OF THE DISCLOSURE A circuit breaker apparatus is taught which in- cludes three time delayed modes of interruption and an instantaneous interruption. A long time delay mode is taught for interrupting overload current in the line to be protected. The latter time delay is inversely proportional to the square of the overload current. A short time delay mode is taught for providing a circuit breaker tripping operation after a predetermined fixed time delay when the current flowing in the line to be protected exceeds a predetermined amount. An asymmetrical fault detecting range of interruption is taught which overlaps the region of overload current which normally would require an instan- taneous tripping of the circuit breaker as a function of the properties of the circuit breaker but which nevertheless delays interruption of the circuit breaker for a relatively short period of time to test subsequent peaks of the fault or overload current to determine if the latter current decays to a value which does not necessitate quick tripping of the circuit breaker during the delay period. The latter case is related to the occurrence of a fully offset asym- metrical transient fault condition.
287163
Elms Robert T.
Meyer Thomas N.
Shimp Alan B.
Mcconnell And Fox
Westinghouse Electric Corporation
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