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SYSTEM AND METHOD FOR ON LINE MONITORING OF INSULATION CONDITION FOR DC MACHINES

  • US 20050218907A1
  • Filed: 12/14/2004
  • Published: 10/06/2005
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
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1. An insulation condition monitoring method, comprising:

  • measuring a first set of values for an instantaneous differential current and an instantaneous voltage during operation of a rotating DC electric machine;

    calculating a value for a phasor current and phasor voltage based upon the first set of values of said instantaneous differential current and said instantaneous voltage, respectively, digitalizing said instantaneous differential current and said instantaneous voltage at a selected frequency for evaluating a desired parameter of insulation condition;

    calculating an angular relationship between said phasor current and said phasor voltage; and

    determining said desired parameter of said insulation condition based on said angular relationship.

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