Ground fault detection apparatus

Details Ground fault detection apparatus Ground fault detection apparatus

1974-04-15

1976-04-27

Miller, J. D.

317 33SC, H02H 328

Patent

active

039537676

ABSTRACT:
Unbalance currents in a-c power line conductors are sensed by a differential current transformer. They are then synchronously detected at the line frequency. A substantial direct current component in the detected signal is indicative of a resistive ground-fault and distinguishes such a fault from other types of unbalanced loading of the a-c power line conductors, such as unbalanced-capacitance-to-ground conditions.

REFERENCES:
patent: 3597656 (1971-08-01), Douglas
patent: 3723814 (1973-03-01), Gross
patent: 3852642 (1974-12-01), Engel et al.

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