Methods and appratus for ground fault circuit interrupt detection using a single transformer
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United States of America Patent
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Dec 9, 2014
Issued Date -
N/A
app pub date -
Jun 25, 2013
filing date -
May 14, 2009
priority date (Note) -
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Abstract
A device is provided for use with an AC power system having a line conductor, a neutral conductor and a transformer, the line conductor and the neutral conductor are coupled between a source and a load, and the transformer includes a first primary winding coupled in series with the line conductor, a second primary winding coupled in series with the neutral conductor, and a secondary winding. The device includes a first circuit coupled to the secondary winding, providing a first detection signal if a current from the line conductor to ground exceeds a first predetermined threshold, and a second circuit coupled to the secondary winding, having a source that provides an AC signal at a specified amplitude and a specified frequency to the secondary winding. The second circuit provides a second detection signal if an impedance between the neutral conductor and ground is less than a second predetermined threshold.
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