Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A Study on the Dielectric Characteristics of Insulation Gases for a Sub-cooled Liquid Nitrogen System

이용률을 이용한 과냉질소 냉각시스템용 절연가스의 절연특성에 관한 연구

  • 강형구 (충주대 첨단과학대 전기공학과) ;
  • 고태국 (연세대 공과대 전기공학과)
  • Published : 2010.03.31
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Abstract

A sub-cooled liquid nitrogen system is known as a promising method to develop high voltage superconducting apparatuses such as superconducting fault current limiters (SFCLs) and superconducting cables. To develop a high voltage superconducting machine adopting the sub-cooled liquid nitrogen system with a constant pressure. injecting a non-condensable gas is indispensable. In this study. the dielectric characteristics of insulation gases are investigated and analyzed by using electric utilization factors ($\xi$). It is found that the maximum electric field at sparkover that occurs with 50 % probability. $E_{MAX.50%}$ exponentially decreases as the S increases. This means that the $E_{MAX.50%}$ at sparkover can be estimated with the $E_{MAX.50%}$

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References

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