Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A study on the barrier effect with respect to the condition of solid insulation materials in GN2

  • Lee, Hongseok (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Mo, Young Kyu (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Lee, Onyou (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Kim, Junil (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Bang, Seungmin (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Kang, Jong O (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Nam, Seokho (Department of Electrical & Electronic Engineering, Applied Superconductivity Lab., Yonsei University) ;
  • Kang, Hyoungku (Department of Electrical Engineering, Korea National University of Transportation)
  • Received : 2015.02.23
  • Accepted : 2015.03.20
  • Published : 2015.03.31
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Abstract

High voltage superconducting apparatuses have been developed presently around the world under AC and DC sources. In order to improve electrical reliability of superconducting apparatuses with AC and DC networks, a study on the DC as well as the AC electrical breakdown characteristics of cryogenic insulations should be conducted for developing a high voltage superconducting apparatus. Recently, a sub-cooled liquid nitrogen cooling system is known to be promising method for developing a high voltage superconducting apparatus. A sub-cooled liquid nitrogen cooling system uses gaseous nitrogen to control the pressure and enhance the dielectric characteristics. However, the dielectric characteristics of gaseous nitrogen are not enough to satisfy the grade of insulation for a high voltage superconducting apparatus. In this case, the application of solid insulating barriers is regarded as an effective method to reinforce the dielectric characteristics of a high voltage superconducting apparatus. In this paper, it is dealt with a barrier effect on the DC and AC dielectric characteristics of gaseous nitrogen with respect to the position and number of solid insulating barriers. As results, the DC and AC electrical breakdown characteristics by various barrier effects is verified.

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References

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