Solid-state trip device for a protective circuit breaker of a th

Details Solid-state trip device for a protective circuit breaker of a th Solid-state trip device for a protective circuit breaker of a th

1990-05-02

1991-12-31

Evans, Geoffrey S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

H02H 308

Patent

active

050776274

ABSTRACT:
The solid-state trip device of a protective circuit breaker of a three-phase mains system comprises a fault type detection circuit comparing the currents flowing in the mains system conductors with a first threshold and a second threshold, higher than the first one. It supplies a signal representative of a certain type of fault, single-phase or two series pole, when a first number of currents are lower than the first threshold and a second number of currents are higher than the second threshold.

REFERENCES:
patent: 3488559 (1970-01-01), Souillard
patent: 4006387 (1977-02-01), Hudak
patent: 4717985 (1988-01-01), Demeyer
patent: 4722059 (1988-01-01), Engel et al.
patent: 4751653 (1988-06-01), Junk et al.
Patent Abstracts of Japan, vol. 7, No. 32 (P-174)(1177) Feb. 8, 1983, 57-184,980.

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