Ultra high speed protective relay circuit

Details Ultra high speed protective relay circuit Ultra high speed protective relay circuit

1979-12-31

1981-10-20

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 83, H02H 328

Patent

active

042964512

ABSTRACT:
A protective relay circuit includes a first a-c level detector or bi-polar threshold circuit to which a polarizing signal V.sub.POL is applied. An output is provided from the first a-c level detector only when the magnitude of V.sub.POL exceeds a predetermined value. Also included is a second a-c level detector or bi-polar threshold circuit to which an operating signal V.sub.OP is applied. An output is provided from the second a-c level detector only when the magnitude of V.sub.OP exceeds a predetermined value. The output of the first level detector is compared in a coincidence circuit with the output of the second level detector. The detection of coincidence for a predetermined time period, as measured by a characteristic timer, results in an output signal for use in controlling operation of a trip coil of a circuit breaker.

REFERENCES:
patent: 3374399 (1968-03-01), Dewey
patent: 3992651 (1976-11-01), Hodges
patent: 4034269 (1977-07-01), Wilkinson
patent: 4092690 (1978-05-01), Wilkinson
patent: 4161011 (1979-07-01), Wilkinson

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