Ground fault circuit interrupter utilizing a single transformer

Details Ground fault circuit interrupter utilizing a single transformer Ground fault circuit interrupter utilizing a single transformer

1975-06-16

1977-01-04

Moose, Harry

317 53, H02H 326

Patent

active

040016463

ABSTRACT:
A GFCI utilizes a single transformer in responding to ground faults on either of the line and neutral conductors of a distribution circuit. The transformer, a differential current transformer, has a secondary winding which is periodically strobed during a first sampling interval for the presence of a fault signal indicative of a line-ground fault. During a second sampling interval, a negative resistance network sets up a ringing oscillation in the transformer secondary circuit. If the neutral conductor is grounded through a low impedance ground fault, the oscillation is damped, and circuit interruption is initiated. Absent a low impedance ground fault on the neutral conductor, the oscillation amplitude increases to exceed a predetermined threshold level during the second sampling interval, and circuit interruption is not initiated.

REFERENCES:
patent: 3786356 (1974-01-01), MacPhee
patent: 3794884 (1974-02-01), Sircom
patent: 3801871 (1974-04-01), Loh
patent: 3879639 (1975-04-01), Sircom

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