Patent ID: 7995315

Claim:
A ground fault protection circuit for an electrical distribution system, the electrical distribution system having a plurality of power sources each having an associated main circuit breaker and being electrically coupled to an associated load with a tie circuit breaker electrically coupled therebetween, the main and tie circuit breakers having associated therewith phase and neutral current transformers (CTs) for sensing an associated current, the ground fault protection circuit comprising: a first auxiliary differential current transformer in signal communication with each output of the phase and neutral current transformers associated with a first of the main circuit breakers; a second auxiliary differential current transformer in signal communication with each output of the phase and neutral current transformers associated with a second of the main circuit breakers; a third auxiliary differential current transformer in signal communication with each output of the phase and neutral current transformers associated with the tie circuit breaker; and a control circuit having a topology that provides signal communication between each of the auxiliary differential current transformers.