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Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise

  • US 5,729,145 A
  • Filed: 05/02/1995
  • Issued: 03/17/1998
  • Est. Priority Date: 07/30/1992
  • Status: Expired due to Term
First Claim
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1. A method for detecting the presence of electrical arcing on an AC power line of frequency F and period T=1/F, comprising the following steps:

  • monitoring the line current, line voltage, or energy emitted from the line as a waveform;

    supplying the monitored waveform to the input of a narrow bandpass variable-frequency filter having a minimum pass frequency substantially higher than F; and

    examining the signal passing through the filter as a function of time, to detect recurring features indicative of arcing.

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