False triggering protection for ground fault sensor

Details False triggering protection for ground fault sensor False triggering protection for ground fault sensor

1974-10-04

1976-08-24

Miller, J D

317 49, H02H 328

Patent

active

039769186

ABSTRACT:
A ground fault detector-interrupter, including a differential transformer for detecting the difference between currents in the hot and neutral conductors connecting a load to an a.c. source, is provided with a resistor shunting the differential transformer primary winding in series with the hot conductor. By shunting part of the current in the hot primary around the differential transformer, the transformer is effectively desensitized under high in-rush current conditions to protect against false triggering that would normally be caused by non-uniformity in the transformer windings and/or less than precise placement of transformer leads.

REFERENCES:
patent: 3555360 (1971-01-01), Lee
patent: 3633070 (1972-01-01), Vassos et al.
patent: 3769548 (1973-10-01), Pardue
patent: 3852642 (1974-12-01), Engel et al.

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