Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Analysis of On-Line Partial Discharge in Air-Coolded Gas Turbine Generator

공랭식 가스터빈 발전기의 운전중 부분방전 분석

  • 이은춘 (한국수자원공사 K-water연구원) ;
  • 공태식 (한국전력공사 전력연구원) ;
  • 김재철 (숭실대학교 전기공학부) ;
  • 김희동 (한국전력공사 전력연구원)
  • Received : 2014.01.28
  • Accepted : 2014.05.13
  • Published : 2014.07.31
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Abstract

The on-line partial discharge (PD) in stator windings of air-cooled gas turbine (GT) generator (119.2MVA, 13.8kV) is measured and analyzed in this paper. This generator was designed by global vacuum pressure impregnation (VPI). The generator failed two times at top bar (16T) of phase B in the stator slot. Six epoxy-mica capacitors were installed in three phases of GT generator. On-line PD test was performed on GT generator using turbine generator analyzer (TGA). TGA showed that the normalized quantity number (NQN) and the PD magnitude($Q_m$) were high in phase B. Internal discharges were generated in phases A, B and C. The trend analysis of NQN and $Q_m$ value are obtained in order to monitor the insulation condition in GT generator stator windings. Phases A and C were in good condition. But phase B had deteriorated significantly

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References

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