The Positive Bubble Effect and the Breakdown Characteristics in $SF_6$ and $LN_2$

$SF_6$와 액체 질소의 절연파괴특성과 정기포현상

  • Published : 2005.08.01

Abstract

In this paper the experiments of breakdown characteristics by temperature change of $SF_6$ gas, $SF_6$ liquid ($LSF_6$) and $N_2$ liquid ($LN_2$) in model GIS(Gas Insulated Switchgear) were described. From the experiments results, the breakdown voltage of $SF_6$ increases with the drop of temperature and the increase of the inner pressure in model GIS. The ability of $LSF_6$ insulation is higher than high-pressurized $SF_6$ gas and $LN_2$. The breakdown characteristics of $LSF_6$ were produced by bubble formed evaporation of $LSF_6$ and bubble caused by high electric emission. It is considered in this paper that the results are fundamental data for electric insulation design of superconductor and cryogenic equipments machine교 which will be studied and developed in the future.

Keywords

References

  1. Landry, M. et al. 'Dielectric withstand and breaking capacity of SF6 circuit breakers at low temperatures' Power Delivery, IEEE Transactions on, pp. 1029-1035, July 1988 https://doi.org/10.1109/61.193883
  2. Gong Guoli et al, 'The influence of SF6 and SF6/N2 dissociating products on the electrical performance of several insulating varnishes', Electrical Insulating Materials, pp. 495-497, 1995 https://doi.org/10.1109/ISEIM.1995.496617
  3. T.Ueda et al, 'Discrimination of Partial Discharge Electromagnetic Signal in SF6 Gas from External Noise Using Phase Gate Control Method', IEEE International Symposium on Electrical Insulation, pp. 117-120, 1996 https://doi.org/10.1109/ELINSL.1996.549297
  4. 이광식 외 3명, '대기압하에서 액체질소(LN2)의 방전특성에 관한 연구', 대한전기학회 논문지 Vol 45 No 7, 1996. 7
  5. C. Beyer et al. 'Influence Reactive SFX Gases on Electrode Surfaces after Electrical Discharge under SF6 Atmosphere', IEEE Trans, pp. 234-240, 2000 https://doi.org/10.1109/94.841815
  6. 주재현, '액체칠소중의 방전형상과 방사전자파의 특성에 관한 연구', 영남대학교 대학원 1997.8
  7. 이광식, '액체질소 및 극저온 가스의 방전특성에 관한 연구', 한국전력공사, 1993.8.
  8. 박경태, '온도변화에 따른 SF6의 방전 및 방사전자파 특성', 영남대학교 대학원, 2002.12
  9. 이광식 외 4명, 'SF6 가스의 온도변화에 따른 절연특성', 대한전기학회 논문지 Vol 52C No 8, 2003.8
  10. Frank M. White, 'Fluid Mechanics', McGraw-Hill, 1995.8