System of protection for electric power distribution failures

Details System of protection for electric power distribution failures System of protection for electric power distribution failures

1993-10-27

1996-01-30

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 87, 361 52, H02H 300

Patent

active

054885329

ABSTRACT:
A system of protection for an electric power distribution system which has at least two parallel power feeders for each electrical phase coupling a source of electrical energy through a contactor device to a load distribution bus comprises a controller, and a parallel feeder current sensor for each parallel power feeder which sense electrical current conducted therein. The parallel feeder current sensors produce output parallel current sense signals proportional to the magnitude of the parallel feeder current sensed, and are coupled to the controller by conductors which communicate the output parallel current sense signals thereto. The controller comprises circuitry which compares the magnitudes of the output parallel current sense signals for each electrical phase. This comparison circuitry generates a first output protection signal when the magnitudes of the output parallel current sense signals differ by at least an amount sufficient to indicate a high impedance fault on at least one of the parallel power feeders. The protection system further comprises circuitry to isolate the high impedance fault by opening the contactor device and de-energizing the source of electrical energy.

REFERENCES:
patent: 3223891 (1965-12-01), McClymont
patent: 3938006 (1976-02-01), Gadwal et al.
patent: 4862308 (1989-08-01), Udren

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