System for detecting faulty SCR's

Details System for detecting faulty SCR's System for detecting faulty SCR's

1981-05-13

1982-11-02

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

323243, H02H 308

Patent

active

043576451

ABSTRACT:
A safety circuit for a silicon controlled rectifier controller of the type wherein the current delivered to a load is determined by controlling the firing angle of the silicon controlled rectifiers. The safety circuit is capable of sensing a shorted condition in the silicon controlled rectifiers and automatically disconnecting the load from the AC mains in the event of such a short circuit condition. Load current is sampled at a time in the cycle where it is expected to be zero. If at the sampling time a non-zero condition is detected, a relay is made to operate to actuate a circuit breaker or to perform other desired functions.

REFERENCES:
patent: 3206675 (1965-09-01), Brunetto
patent: 3548289 (1970-12-01), Liska et al.
patent: 3679970 (1972-07-01), Winters et al.
patent: 4031465 (1977-06-01), Sterner
patent: 4056776 (1977-11-01), Olsson et al.
patent: 4142151 (1979-02-01), Hansen
patent: 4156189 (1979-05-01), Genuit et al.
patent: 4167698 (1979-09-01), Podlewski

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