Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Analysis of Parameters on Partial Discharges from Insulation Defects of used Hydro Generator Stator Windings

수력발전기 고정자 노후권선의 모의결함 시편에 대한 부분방전 파라미터 변화 분석

  • 오봉근 (한국수자원공사 수자원연구원) ;
  • 김현일 (한국수자원공사 수자원연구원) ;
  • 강성화 (충청대학 소방안전과) ;
  • 임기조 (충북대학교 전기전자컴퓨터공학부)
  • Published : 2007.07.01
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Abstract

Partial discharge(PD) test for simulated insulation defects of used hydro generator stator winding was conducted to analyze the PD Parameters. Simulated insulation defects are classified by 5 types corona, slot, internal, multi and aging defect. Phase resolved partial discharge, statistical parameter (skewness, kurtosis), PD magnitude as a function of the test voltage(Q-V curve) and PD magnitude change under test voltage for 2 minutes are used as PD parameters. The analysis of PD parameters by 4 types are proved to be useful methods. In particular, PD parameter characteristics of aging defect could help to assess the aging condition of stator winding because aging defect has more weak insulation strength than other insulation defects : PD distribution is wide and flat, PD rises rapidly near $0^{\circ}\;and\;180^{\circ}$ and Q-V curve rises sharply and then gently drops.

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References

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