Arc fault detector device utilizing the di/dt and 60 Hz components of an arcing waveform
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United States of America Patent
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Jun 10, 2003
Grant Date -
N/A
app pub date -
Dec 12, 2000
filing date -
Dec 12, 2000
priority date (Note) -
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Abstract
An arc fault detector for detecting arcing faults in an electrical distribution/branch circuit includes both a di/dt detector/amplifier and a 60 Hz (threshold) detector/amplifier connected to a current sensor. The detector includes a circuit which masks inductive/tungsten in-rush current such as is generated by a dimmer switch. The current sensor is a toroidal current transformer, with either two LINE conductors or a LINE and a NEUTRAL conductor passing through the toroid. A multi-winding secondary is formed around the toroidal core whose terminations constitute the output of the current sensor. When the outputs of both detectors simultaneously indicate fault current which is not due to a dimmer switch, a breaker coil is energized which in turn de-energizes the electrical distribution/branch circuit.
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