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INSULATION DIAGNOSTIC UNIT AND ALGORITHM FOR ELECTRIC MACHINE, AND EQUIPMENT INCLUDING THE DIAGNOSTIC UNIT

  • US 20110184672A1
  • Filed: 01/24/2011
  • Published: 07/28/2011
  • Est. Priority Date: 01/26/2010
  • Status: Abandoned Application
First Claim
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1. An insulation diagnostic unit for an electric machine comprising:

  • a sensor disposed near an electric machine;

    an instrument that performs spectrum analysis on an output of the sensor;

    a load detection method for the electric machine;

    a data table in which an output of the load detection method and an output of the spectrum analysis instrument are recorded;

    a first routine that notes a spectrum relevant to a specific frequency, which is obtained by the spectrum analysis instrument, from among data items recorded in the data table, and obtains a correlation coefficient on the basis of a plurality of data items concerning magnitudes of the noted spectrum, and a plurality of data items of a load obtained at the times of measurement of the plurality of data items; and

    a second routine that classifies the noted spectrum relevant to the specific frequency into a spectrum of an environmental electromagnetic wave or a spectrum of an electromagnetic wave due to partial discharge from the electric machine on the basis of the value of the correlation coefficient obtained by the first routine.

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