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METHODS AND APPARATUS FOR CONTINUOUS GROUND FAULT SELF-TEST

  • US 20130141110A1
  • Filed: 01/23/2013
  • Published: 06/06/2013
  • Est. Priority Date: 11/02/2006
  • Status: Active Grant
First Claim
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1. A method to self-test a ground fault detector comprising:

  • continuously drawing current for a ground fault detector circuit from a line conductor and a neutral conductor;

    diverting the current to cause a first current imbalance in a sense coil for a first half of a power-line cycle;

    diverting the current to cause a second current imbalance in the sense coil for a second half of the power-line cycle; and

    monitoring a secondary winding of the sense coil for the current imbalance caused by at least one of the first and second current imbalance or a signal indicative of a fault.

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