Alternating current power loss detector

Details Alternating current power loss detector Alternating current power loss detector

1986-08-01

1989-08-08

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 340663, G08B 2100

Patent

active

048557226

ABSTRACT:
The duration of time during which an AC power voltage sinusoidal waveform remains between negative voltage threshold -V1 volts, nominally 5% of negative peak voltage -V2 volts, and positive voltage threshold +V1 volts, nominally 5% of peak positive voltage +V2 volts, is detected. By the change in voltage with time exhibited by a sinusoidal waveform in the region of zero voltage crossing, the expected time duration between voltage thresholds in approximately 5% of one-half period of such sinusoidal waveform. If the actual time between voltage thresholds exceeds (nominally) twice this value, or 10% of one-half period, then a power black-out condition is sensed, and a power fault signal is produced.

REFERENCES:
patent: 3836854 (1974-09-01), Wehman
patent: 4099068 (1978-07-01), Kobayashi et al.
patent: 4228429 (1980-10-01), Tsuchiya et al.
patent: 4567539 (1986-01-01), Sinberg
patent: 4594517 (1986-06-01), Cohen et al.
patent: 4642616 (1987-02-01), Goodwin

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