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Characteristics of Insulation Diagnosis and Failure in 6.6 kV Motor Stator Windings

6.6 kV 전동기 고정자 권선의 절연진단과 절연파괴 특성

  • Kim, Hee-Dong (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Kong, Tae-Sik (Korea Electric Power Corporation (KEPCO) Research Institute)
  • 김희동 (한국전력공사 전력연구원 기술전문센터) ;
  • 공태식 (한국전력공사 전력연구원 기술전문센터)
  • Received : 2012.03.05
  • Accepted : 2012.03.22
  • Published : 2012.04.01

Abstract

To assess the condition of stator insulation, nondestructive and overpotential tests were performed on four high voltage motors. The stator windings under these tests have nominal ratings of 6.6 kV. After completing nondestructive tests, the AC overvoltage applied to the stator windings was gradually increasing until insulation failure in order to obtain the breakdown voltage. No. 1, No. 2, No. 3 and No. 4 of 6.6 kV motors failed near rated voltage of 18.4 kV, 19.8 kV, 19.7 kV and 21.7 kV, respectively. The breakdown voltage of four motors was higher that expected for good quality coils(14.2 kV) in 6.6 kV motors. Almost all of failures were located in a line-end coil at the exit from the core slot. The breakdown voltages and the types of defects showed strong relation to the stator insulation tests such as in the case of AC current, dissipation factor($tan{\delta}$) and partial discharge magnitude.

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References

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