Ground fault circuit interrupting device with grounded neutral d

Details Ground fault circuit interrupting device with grounded neutral d Ground fault circuit interrupting device with grounded neutral d

1975-05-19

1976-08-03

Moose, Harry

317 27R, H02H 328

Patent

active

039731715

ABSTRACT:
The secondary winding of the differential current transformer in a ground fault circuit interrupter is normally short circuited through an electronic switch. A relaxation oscillator, including a timing capacitor, acts to periodically open the switch and divert any secondary current through a burden resistor, developing thereacross a relatively high amplitude fault signal voltage indicative of a liine ground fault. The timing capacitor discharges through the primary winding of a second transformer coupled with the neutral conductor to develop, in the event of a desensitizing neutral ground fault, a fault signal voltage across the burden resistor.

REFERENCES:
patent: 3772569 (1973-11-01), Wible
patent: 3836821 (1974-09-01), Wahlgren et al.

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