Ground fault protective system including an impedance responsive

Details Ground fault protective system including an impedance responsive Ground fault protective system including an impedance responsive

1974-02-25

1976-01-27

Trammell, James D.

317 27R, 317 33SC, H02H 328

Patent

active

039355101

ABSTRACT:
A ground fault protective system and method in which an impedance responsive oscillator detects low impedance ground faults on the neutral conductor of an electrical distribution circuit and responds thereto to provide a partially or totally attenuated output signal. A level detector senses the magnitude of the output signal of the oscillator and causes a trip circuit to open contacts in the electrical distribution circuit whenever the attenuated oscillator output signal occurs.

REFERENCES:
patent: 3506906 (1970-04-01), Nestor
patent: 3772569 (1973-11-01), Wible
patent: 3800189 (1974-03-01), Montz

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