Overcurrent relays

Details Overcurrent relays Overcurrent relays

1979-08-02

1982-03-23

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 364483, H02H 3093

Patent

active

043216471

ABSTRACT:
A time relay comprising a device (1) arranged to produce an output (F) having a frequency representative of a parameter (I) to be monitored, a comparator (5) responsive to the output (F) for producing an output (IN) when the value of the monitored parameter exceeds a setting value, and relay operating circuitry for operating the relay when the comparator produces an output for a time determined by the relay characteristic for the value of the monitored parameter. The device is suitably a Carrier Domain Magnetometer (C.D.M.) and the operating circuitry suitably includes a digitally addressable memory (8) in which the relay characteristic is stored.

REFERENCES:
patent: 3599045 (1971-08-01), Farinas
patent: 3656026 (1972-04-01), Zocholl
patent: 3885199 (1975-05-01), Nohara et al.
patent: 3914667 (1975-10-01), Waldron
patent: 3922587 (1975-11-01), Jones
patent: 3938007 (1976-02-01), Boniger et al.
patent: 4017766 (1977-04-01), Vercelloti et al.
patent: 4231029 (1980-10-01), Johnston

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