Overcurrent tripping unit for a circuit breaker

Details Overcurrent tripping unit for a circuit breaker Overcurrent tripping unit for a circuit breaker

1988-05-18

1989-08-01

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, 361 44, 361 96, H02H 332

Patent

active

048538191

ABSTRACT:
In the overcurrent tripping unit for a circuit breaker, current transformers are provided for detecting currents flowing through respective phases of a main circuit, the secondary outputs of the current transformers are star connected, the primary outputs are polyphase full-wave rectified, the voltage drop based on the rectified positive
egative direct output of each phase is directed by first and second resistances to be applied to the control means, and a ground fault current is detected based on the secondary outputs of the current transformers to be applied to the control means.

REFERENCES:
patent: 4347540 (1982-08-01), Gary et al.
patent: 4380785 (1983-04-01), Demeyer et al.
patent: 4761704 (1988-08-01), Fraisse et al.

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