Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Characteristics of Surface Flashover of spacer in Liquid Nitrogen

액체 질소중에서 고체 Spacer에 의한 연면 방전특성

  • Kim, Y.S. (Dept. of Electrical and Electronic Engineering, Gyeongsang National University) ;
  • Back, S.M. (Dept. of Electrical and Electronic Engineering, Gyeongsang National University) ;
  • Lee, B.S. (Dept. of Electrical and Electronic Engineering, Gyeongsang National University) ;
  • Jang, H.M. (Dept. of Electrical and Electronic Engineering, Gyeongsang National University) ;
  • Kim, S.H. (Dept. of Electrical and Electronic Engineering, Gyeongsang National University)
  • 김영석 (경상대학교 공과대학 전기공학과) ;
  • 백승명 (경상대학교 공과대학 전기공학과) ;
  • 이병성 (경상대학교 공과대학 전기공학과) ;
  • 장현만 (경상대학교 공과대학 전기공학과) ;
  • 김상현 (경상대학교 공과대학 전기공학과)
  • Published : 1999.11.20
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Abstract

Composite insulation system of liquid nitrogen and solid spacer is widely applied in high temperature superconducting power machine. This study has three step procedure. As follow, first step is composition of parallel deposited electrode and vertically deposited electrode along the direction of immersion in liquid nitrogen($LN_2$). Second step is investigation into surface flashover voltage of solid spacer under partially immersed in $LN_2$, and last step is comparison the result of this research with that of fully immersed in $LN_2$ and at cryogenic temperature gaseous nitrogen($GN_2$). This result presented that surface flashover voltage along solid spacer half immersed in $LN_2$ was almost the same as that of fully immersed spacer when the thickness of spacer(t) was t<10 mm. In the case of t>10 mm, however, spacer flashover voltage was equal to that obtained in $GN_2$ at cryogenic temperature.

Keywords