Apparatus and method to detect a series arc fault of an...

Details Apparatus and method to detect a series arc fault of an... Apparatus and method to detect a series arc fault of an...

H - Electricity

01

H

H01H 71/74 (2006.01) H02H 3/00 (2006.01)

Patent

CA 2739783

An apparatus is for a power circuit providing an alternating current to a load. The apparatus includes a high frequency current sensor structured to cooperate with the power circuit to provide a high frequency current signal. A voltage zero crossing detector is structured to cooperate with the power circuit to provide a voltage zero crossing signal. A high pass filter is structured to provide a filtered current signal from the high frequency current signal. A threshold comparator is structured to provide an output when the filtered current signal exceeds a predetermined value. A processor is structured to receive the voltage zero crossing signal and the output of the threshold comparator and output a trip signal in response to undesired series arcing by detecting an unsymmetrical high frequency signal for a predetermined number of cycles.

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