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Insulation defect detection of high voltage generator stator core

  • US 9,658,192 B2
  • Filed: 01/16/2013
  • Issued: 05/23/2017
  • Est. Priority Date: 01/23/2012
  • Status: Active Grant
First Claim
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1. A method for detecting an insulation defect in a generator core, comprising:

  • flowing an alternating excitation current at a first excitation frequency through an excitation winding adjacent the generator core to induce first eddy currents between laminations at the defect;

    measuring a first potentiometer voltage indicating magnetic flux caused by the first eddy currents induced at the first excitation frequency;

    flowing an alternating excitation current at a second excitation frequency through the excitation winding adjacent the generator core to induce second eddy currents between the laminations at the defect;

    measuring a second potentiometer voltage indicating magnetic flux caused by the second eddy currents induced at the second excitation frequency; and

    determining a severity of the defect and a depth of the defect using a response voltage relationship among the potentiometer voltages, the excitation frequencies, the severity of the defect, and the depth of the defect,wherein the response voltage relationship comprises fitting parameters and a term wherein the excitation frequency is raised to a function of a fitting parameter.

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