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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Partial Discharge Characteristics on Protrusion Defects in SF6-N2 Mixture Gases

SF6-N2 혼합가스 중 돌출 결함의 부분방전 특성

  • Jo, Hyang-Eun (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Wang, Guoming (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Sun-Jae (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Park, Kyoung-Soo (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kil, and Gyung-Suk (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
  • 조향은 (한국해양대학교 전기전자공학과) ;
  • 왕국명 (한국해양대학교 전기전자공학과) ;
  • 김선재 (한국해양대학교 전기전자공학과) ;
  • 박경수 (한국해양대학교 전기전자공학과) ;
  • 길경석 (한국해양대학교 전기전자공학과)
  • Received : 2015.11.18
  • Accepted : 2015.12.04
  • Published : 2016.01.01
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Abstract

Studies on a $SF_6$-mixture and -alternative gas has been in progress to reduce the use of $SF_6$ gas as an insulation material of GIS (gas insulated switchgears). In this paper, we dealt with PD (partial discharge) characteristics in pure $SF_6$ and $N_2$, and their mixtures on aspects of insulation design and risk assessment for GIS. A POC (protrusion on conductor) and a POE (protrusion on enclosure) as the major defects were fabricated to simulate PD. We analyzed the DIV (discharge inception voltage), DEV (discharge extinction voltage), pulse magnitude, counts and phase distribution of PD pulse in $SF_6-N_2$ mixtures ($SF_6$ 100%, $SF_6$ 80%-$N_2$ 20%, $SF_6$ 50%-$N_2$ 50%, $SF_6$ 20%-$N_2$ 80%, and $N_2$ 100%) according to the IEC60270. The DIV, DEV as well as magnitude of PD pulse decreased on the POC as increase of $N_2$ ratio. For the POE, the DIV and DEV in $N_2$ ratio below 50% were the same voltages as those in $SF_6$ 100%. In this experiment, $SF_6$ 80%-$N_2$ 20% mixture could be considered with the equivalent insulation performance to a GIS.

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References

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