Arc fault detector with limiting of sensed signal to shape response characteristic and circuit breaker incoprorating same
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United States of America Patent
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Sep 29, 1998
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N/A
app pub date -
Sep 29, 1997
filing date -
Sep 29, 1997
priority date (Note) -
Expired
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Abstract
An arc fault detector having a pulse generator generating a pulse each time an arc is struck includes a limiting amplifier which limits the amplitude of the pulses to discriminate against false trips from sizable singular events such as tungsten bulb burnout and turn-on of a cold tungsten lamp controlled by a phased back dimmer. When a time attenuated accumulation of the pulses reaches a predetermined level an arc fault signal which can be used to trip the circuit breaker is generated. The pulse generator of the arc fault detector includes multiple stages of high pass filtering which produces overshoot and therefore additional pulses each time an arc is struck. As only the additional pulses associated with large amplitude arcs exceed a threshold value for inclusion in the time attenuated accumulation, compensation for the reduction in sensitivity to large amplitude arcs imposed by the limiting amplitude is provided.
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