Systems and methods for locating a ground fault without...

Details Systems and methods for locating a ground fault without... Systems and methods for locating a ground fault without...

2005-01-18

2005-01-18

Le, N. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S510000, C361S042000, C361S062000

Reexamination Certificate

active

06844736

ABSTRACT:
Systems and methods for locating any grounded circuit on an ungrounded AC or DC system without de-energizing the circuit, and enabling isolation of the grounded component of the circuit. A load is fed through an isolation device, such as a transformer for AC systems or a DC-to-DC converter for DC systems, and isolated from the normal distribution system without ever being de-energized. Once the isolating device is paralleled with the normal source for the load, the normal source is removed, leaving the load energized and fed by the isolating device. A ground detector relay is added at the secondary side of the isolation device to detect unwanted grounds along with a ground locating method to isolate the source of the ground, such as by oscillating the ground current. Once the grounded circuit is located, further troubleshooting may be performed to isolate the grounded component.

REFERENCES:
patent: 5239441 (1993-08-01), Fox et al.
patent: 5574611 (1996-11-01), Nishijima et al.

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