Portable ground fault protector

Details Portable ground fault protector Portable ground fault protector

1978-10-26

1980-08-05

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 44, H02H 326

Patent

active

042165164

ABSTRACT:
In the absence of a ground fault, a triac completes an AC energization circuit for a relay whose contacts then close to provide load circuit continuity. Gate drive for the first triac is obtained from a secondary winding of a transformer whose primary is driven by an oscillator for the purpose of producing a differential transformer unbalancing current signal in the event of a desensitizing ground fault on the load circuit neutral conductor. When the differential transformer senses a ground fault, the oscillator is disabled, and the resulting loss of gate drive renders the triac non-conductive to drop out the relay.

REFERENCES:
patent: 3641393 (1972-02-01), Florance et al.
patent: 3668471 (1972-06-01), Ambler et a.
patent: 3872354 (1975-03-01), Nestor et al.
patent: 3953766 (1976-04-01), Howell et al.
patent: 4023073 (1977-05-01), Georgi
patent: 4047079 (1977-09-01), MacPhee

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