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AC Breakdown Voltage Simulation of SF6/N2 Mixture in Non-Uniform Field and Its Comparison with Experimental Values

불평등 전계에서 SF6/N2 혼합가스의 AC 절연파괴전압 시뮬레이션 및 실험값와의 비교

  • 이병택 (인하대학교 전기공학과) ;
  • 황청호 (인하대 공대 전기공학) ;
  • 이태호 (LS전선 중앙연구소) ;
  • 허창수 (인하대 공대 전기공학과) ;
  • 장용무 (한양대학교 퓨전전기기술응용연구센터) ;
  • Received : 2010.04.20
  • Accepted : 2010.06.22
  • Published : 2010.08.01

Abstract

$SF_6$ is the most commonly used insulating gas in electrical systems. But In these days $SF_6$ mixtures and alternative gas has been studied because of global warming. so although many studies have been carried out about binary gas mixtures with $SF_6$, few studies were presented about breakdown characteristics of $SF_6/N_2$ mixtures. At present study the breakdown characteristics of $SF_6/N_2$ mixtures in Non-uniform field was performed. In this paper, The simulation value are compared with experiment values. Streamer breakdown criterion was used for predicting breakdown voltage. For accurate simulation this simulation apply utilization factor using CST(computer simulation technology) EM $studio^{tm}$ program. AC breakdown experiments in non-uniform field was performed to compare with the breakdown simulation values. The pressure range of gas mixtures was 0.4 MPa to 0.7 MPa. The rod-plane was used and mixture ratio is $SF_6$ 20% : $N_2$ 80%. The gap lengths are 10mm to 70mm. As the pressure increase, this simulation value does not correspond to the experiment value. So this simulation need surface roughness factor. As a result of applying surface roughness factor this simulation decrease a relative error (|experiment value - simulation value| /simulation value).

Keywords

References

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