Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference (한국초전도저온공학회:학술대회논문집)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Characteristic of sub-cooled nitrogen cryogenic system for 6.6kV/200A Inductive Superconducting Fault Current Limiter

6.6kV/200A급 유도형 한류기용 과냉질소 냉각시스템의 특성

  • 박동근 (연세대학교 전기전자공학과) ;
  • 강형구 (연세대학교 전기전자공학) ;
  • 윤경용 (연세대학교 전기전자공학) ;
  • 주민석 (연세대학교 전기전자공학) ;
  • 김태중 (성남기능대) ;
  • 고태국 (연세대학교 전기전자공학과)
  • Published : 2003.10.01
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Abstract

The cryogenic system for inductive superconducting fault current limiter (SFCL) has been investigated recently. In this investigation, the sub-cooled nitrogen cryogenic system was adopted to enhance the performance of DC reactor for 6.6㎸/200A inductive SFCL. In sub-cooled nitrogen state at 64K, the critical current value and the thermal conductivity are larger than those of saturated nitrogen state at 77K and the electrical insulation capacitance should be remarkably enhanced. The solenoid type of 84mH superconducting DC reactor was fabricated and cooled down to 64K by using sub-cooled cooling method with GM-cryocooler and rotary pump. The fabrication techniques of cryogenic system and some experimental results such as cooling down characteristic are introduced in this study. Moreover, the sub-cooled nitrogen cryogenic system was detailedly introduced in this paper.

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