Arc fault circuit interrupter for a compressor load
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United States of America Patent
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Sep 11, 2007
Grant Date -
Oct 12, 2006
app pub date -
Apr 11, 2005
filing date -
Apr 11, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An arc fault circuit interrupter includes separable contacts electrically connected between line and load terminals, and a current sensor adapted to sense current flowing between the terminals and through the contacts. An arc fault detection circuit is adapted to collect a plurality of samples of the sensed current for a line cycle, determine a first slope of the sensed current at about a zero crossing of a line voltage, determine a magnitude of one of the samples at about the zero crossing, determine a second slope of the sensed current at another one of the samples having about the magnitude, with the first slope being opposite in polarity with respect to the second slope. The arc fault detection circuit calculates a difference between the slopes, and generates a trip signal as a function of the difference. An operating mechanism is adapted to open the contacts responsive to the trip signal.
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