H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/02 (2006.01) H02H 1/06 (2006.01) H02H 3/10 (2006.01)
Patent
CA 1131296
48,200 ABSTRACT OF THE DISCLOSURE A ground fault detecting circuit interrupter is taught. A ground fault is sensed by utilizing a summing transformer interconnected with the three-phase current transformers for normal fault detection. The turns ratio between the primary winding and the secondary winding of the summing transformer is kept purposely high so that the excitation current for the current transformers is made relatively small when compared to the normal secondary current of the current transformers. This has the effect of improving the accuracy of the normal fault detecting portion of the circuit breaker. The relatively high turns ratio between the primary and second of the summing trans- former usually supplies insufficient current to directly actuate the trip coil of the circuit interrupter on the occurrence of a ground fault. However, this latter cur- rent is utilized to charge a capacitive storage element after a ground fault has been sensed. When the capacitive storage element is fully charged, it is switched into a circuit disposition suitable for discharge through the trip coil of the circuit interrupter with sufficient current flow to open the separable main contacts of the circuit interrupter.
350497
Mcconnell And Fox
Westinghouse Electric Corporation
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