Electrical Properties of Wet Bars in Water-cooled Generator Stator Windings

흡습된 수냉각 발전기 고정자 권선의 전기적 특성

  • Kim, Byeong-Rae (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Kim, Hee-Dong (Korea Electric Power Corporation (KEPCO) Research Institute)
  • 김병래 (한국전력공사 전력연구원 기술전문센터) ;
  • 김희동 (한국전력공사 전력연구원 기술전문센터)
  • Received : 2012.08.15
  • Accepted : 2012.09.13
  • Published : 2012.10.01


Insulation breakdown of water-cooled generator stator windings occurs frequently due to leakage of cooling water and absorption into the insulation material. Leakage and absorption problems of water-cooled stator windings are often found during regular preventive maintenance. To evaluate cooling water leakage and absorption, diagnostic tests were performed on two water-cooled turbine generators, which have been in service for 13 and 17 years, respectively. The test results of the measured electrical properties such as dissipation factor($tan{\delta}$), capacitance and AC leakage current for water-cooled generator stator windings with wet bars are reported in this paper.


Supported by : 한국동서발전(주)


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