Electronic underfrequency relay

Details Electronic underfrequency relay Electronic underfrequency relay

1975-04-08

1976-11-23

Strecker, Gerard R.

Communications: electrical

Systems

Call station

324 78D, 324 78Q, 324 78Z, 324186, 307234, 328134, G08B 2100

Patent

active

039939847

ABSTRACT:
A method and apparatus for detecting an underfrequency condition of an alternating current power line is disclosed wherein the frequency of the power line is sensed, an underfrequency signal is developed whenever the power line frequency decreases below a predetermined frequency, a known frequency source is thereafter substituted for the alternating current power line, and the frequency of this source is checked by the same circuitry to produce a second output signal, and an underfrequency signal is generated in response to both first and second output signals.

REFERENCES:
patent: 3842347 (1974-10-01), Terbrack
patent: 3895293 (1975-07-01), Munz

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