Ground monitor current sensing
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United States of America Patent
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Nov 24, 2015
Grant Date -
Jun 26, 2014
app pub date -
May 31, 2013
filing date -
Dec 20, 2012
priority date (Note) -
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Abstract
A ground monitor apparatus for monitoring ground current includes a DC detection module, a DC threshold module, and a trip module. The current monitor module monitors current in a pilot conductor or a ground return. The pilot conductor injects current in a grounding conductor of a power cable assembly connecting a power source to a load. A voltage source is connected to the pilot conductor and the ground return. The DC detection module determines a direct current (“DC”) current present in the current monitored by the current monitor module and the DC threshold module determines if the DC current is above a DC current threshold. The trip module opens a contact in response to the DC threshold module determining that the DC current is above the DC current threshold. The contact disconnects the power source from the power cable assembly.
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