Ground fault trip mode network for static trip circuit breakers

Details Ground fault trip mode network for static trip circuit breakers Ground fault trip mode network for static trip circuit breakers

H - Electricity

02

H

348/26

H02H 3/16 (2006.01) H02H 1/00 (2006.01) H02H 3/10 (2006.01) H02H 7/26 (2006.01)

Patent

CA 1145837

41PR-6102 GROUND FAULT TRIP MODE NETWORK FOR STATIC TRIP CIRCUIT BREAKERS ABSTRACT OF THE DISCLOSURE The secondary currents of plural current transformers are applied to a full-wave rectifying network for developing an overcurrent signal and a ground fault current signal; the flowing in a circuit path embraced by the toroidal core of a miniature current transformer. A transformed ground fault current signal appearing in the multi-turn secondary winding thereof is applied to a ground fault trip mode network operating to measure the signal magnitude against an adjustably established, continuous ground fault trip-time curve including a vertical pick-up curve portion and a sloping inverse time (r2t) delay portion which terminates in a selected one of plural horizontal, fixed time delay portions pursuant to issuing an appropriately delayed ground fault trip signal. Provisions for zone selective interlocking between upstream and downstream breakers are also described.

357087

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