Method and arc fault circuit interrupter employing a...

Details Method and arc fault circuit interrupter employing a... Method and arc fault circuit interrupter employing a...

H - Electricity

01

H

H01H 73/18 (2006.01) H01H 83/00 (2006.01)

Patent

CA 2542194

An arc fault detection circuit collects samples of sensed current, determines a peak current value from the samples for each line cycle, determines a hysteresis value for a compressor load as a function of differences between the peak current values, and generates a trip signal responsive to the sensed current and the hysteresis value. The circuit determines a difference value for each line cycle from the present peak current value less the previous peak current value, low pass filters the difference value to provide a low pass filtered value, determines a peak value from the low pass filtered value, determines that the absolute value of the low pass filtered value is less than a portion of the peak value and responsively saves the peak value, and determines the hysteresis value as a function of the saved peak value. An operating mechanism opens separable contacts responsive to the trip signal.

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