Ground fault protection circuit for multi-source electrical...

Details Ground fault protection circuit for multi-source electrical... Ground fault protection circuit for multi-source electrical...

2011-08-09

2011-08-09

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

07995315

ABSTRACT:
Disclosed herein is 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 includes first, second and third auxiliary differential current transformers, each in signal communication with outputs of respective phase and neutral current transformers associated with respective first and second main circuit breakers and a tie circuit breaker. A control circuit has a defined topology that provides signal communication between each of the auxiliary differential current transformers.

REFERENCES:
patent: 3558981 (1971-01-01), Zocholl
patent: 3949272 (1976-04-01), Smith
patent: 4110808 (1978-08-01), Hobson et al.
patent: 5751524 (1998-05-01), Swindler
patent: 2002/0080535 (2002-06-01), Swindler et al.
patent: 2010/0008000 (2010-01-01), Riley et al.
Power Systems Engineering Data, vol. 1, No. 8; “ Modified Differential Ground Fault Protection”; Authors: David L. Swindler and Carl J. Fredericks; Published by: Square D; Jul. 1994.
Power Monitoring; Summing Transformers, Model 190XSUM; KELE (www.kele.com).

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