Volt-per-hertz protection apparatus

Details Volt-per-hertz protection apparatus Volt-per-hertz protection apparatus

1988-05-20

1989-07-11

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 79, 361 86, 361 87, 361 89, 361 94, H02H 302

Patent

active

048477230

ABSTRACT:
An inverse-time timer for a volt/Hertz ratio relay includes a ladder of level detectors associated with a like series of counters connected in cascade with a variable voltage-to-frequency connector responsive to the v/Hz ratio signal for controlling the counters to establish the time delay for tripping.

REFERENCES:
patent: 4731690 (1988-03-01), Beg et al.

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