Line frequency deviation monitor

Details Line frequency deviation monitor Line frequency deviation monitor

1977-09-16

1979-01-30

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78D, G01R 2302

Patent

active

041374967

ABSTRACT:
A monitor for indicating deviation of an alternating current power source from a nominal operating frequency. The monitor circuit provides an indication when the frequency being measured is at its nominal value and provides further indications when it differs from the nominal frequency by a predetermined amount either in an above-frequency or a below-frequency manner. Further means are provided to supply an alarm indication indicative of an out-of-tolerance deviation either in a high or low frequency.

REFERENCES:
patent: 2987674 (1961-06-01), Shain
patent: 3304504 (1967-02-01), Horlander
patent: 3514697 (1970-05-01), Oswald

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