Ground fault circuit interrupting device with grounded...

Details Ground fault circuit interrupting device with grounded... Ground fault circuit interrupting device with grounded...

H - Electricity

02

H

348/24

H02H 3/28 (2006.01) H02H 3/33 (2006.01)

Patent

CA 1063223

ABSTRACT OF THE DISCLOSURE A 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 line ground fault. The timing capacitor discharges through the primary winding of a second transformer couple with the neutral conductor to develop, in the event of a desensitizing neutral ground fault, a fault signal voltage across the burden resistor.

250813

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