Ground fault interrupter apparatus with means protecting against

Details Ground fault interrupter apparatus with means protecting against Ground fault interrupter apparatus with means protecting against

1973-06-11

1976-05-25

Miller, J. D.

317 27R, H02H 316

Patent

active

039596931

ABSTRACT:
Ground fault interrupter apparatus of the differential transformer type is provided with an additional output transformer, the primary of which is connected between a line conductor and the neutral conductor of an A.C. system with a current limiting resistor adjacent the primary winding. The secondary of the output transformer is the neutral conductor. THe saturation properties of the core of the output transformer are such that during each half cycle a voltage pulse is induced in the secondary. The voltage pulse is of no consequence in the system during normal conditions but if a grounded neutral condition exists a current is produced in the neutral conductor unbalancing the differential transformer and interrupting operation.

REFERENCES:
patent: 2063307 (1936-12-01), Gurtler
patent: 3506906 (1970-04-01), Nestor
patent: 3611035 (1971-10-01), Douglas
patent: 3728580 (1973-04-01), Moarot

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