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Two winding resonating arc fault sensor which boosts arc fault signals while rejecting arc mimicking noise

  • US 6,876,528 B2
  • Filed: 11/05/2002
  • Issued: 04/05/2005
  • Est. Priority Date: 03/04/2000
  • Status: Expired due to Term
First Claim
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1. A sensor for an arc fault detecting device for protecting an electric power circuit including a neutral wire and a hot wire, comprising:

  • a transformer with the neutral and hot wires forming primaries;

    a first secondary winding wound next to the hot wire, and arranged to receive more of the hot wire flux than the neutral wire flux; and

    a second secondary winding wound next to the neutral wire, and arranged to receive more of the neutral wire flux than the hot wire flux;

    wherein the first and second secondary windings are connected as signal series adding for common mode currents, and signal series opposing for differential mode currents.

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