Detection of ground faults in ungrounded DC power supply systems

Details Detection of ground faults in ungrounded DC power supply systems Detection of ground faults in ungrounded DC power supply systems

1985-01-08

1987-01-20

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3102

Patent

active

046382453

ABSTRACT:
An apparatus for detecting a ground fault in an ungrounded DC power supply system having a DC power supply connected by positive and negative lines to a load, an AC voltage is selectively applied between a positive line and ground or between a negative line and ground. A current sensor including an electrical coil surrounding the positive and negative lines is responsive to significant alternating current in one of the lines, when the AC voltage is applied to the line and the line has a ground fault, to thereby indicate the fault.

REFERENCES:
patent: 2529126 (1950-11-01), Barnes
patent: 3218622 (1965-11-01), Gardner
patent: 3274489 (1966-09-01), Behr
patent: 3754221 (1973-08-01), Stelter

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