Gfci ground fault current filtering

Details Gfci ground fault current filtering Gfci ground fault current filtering

H - Electricity

01

H

H01H 83/02 (2006.01) H02H 1/04 (2006.01) H02H 3/33 (2006.01)

Patent

CA 2299861

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.

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