GFCI ground fault current filtering

Details GFCI ground fault current filtering GFCI ground fault current filtering

1999-03-01

2000-08-01

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, H02H 300

Patent

active

060975806

ABSTRACT:
A system for controlling the response of a ground fault circuit interrupter in the presence of random leakage currents due to the presence of a conductive media such as water or ice. The signal from a magnetic core differential transformer is applied to two filters in parallel. The first filter passes the fundamental frequency of the source and the second filter passes a broad band of frequencies starting at twice the fundamental frequency. The output of the filters are applied to a microprocessor which manipulates the filter outputs and compares certain of the filter outputs to a stored pattern of expected current leakage. The microprocessor operates a relay to disconnect the load from the source when a fault condition exists.

REFERENCES:
patent: 4200897 (1980-04-01), Dawley
patent: 5416692 (1995-05-01), Shimizu et al.
patent: 5920451 (1999-07-01), Fasano et al.
patent: 6025980 (2000-02-01), Morron et al.

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