Development of cooling system with sub-cooled nitrogen for DC Reactor of 6.6 ㎸-200A class HTS fault current limiter

6.6 ㎸-200A급 HTS 한류기 DC Reactor용 과냉질소 냉각시스템의 개발

  • 김형진 (홍익대학교 과학기술 연구소) ;
  • 권기범 (홍익대학교 과학기술 연구) ;
  • 강형구 (연세대학교 전기전자공학) ;
  • 배덕권 (연세대학교 전기전자공학) ;
  • 안민철 (연세대학교 전기전자공학) ;
  • 정은수 (홍익대학교 기계시스템디자인공학) ;
  • 장호명 (홍익대학교 기계시스템디자인공학) ;
  • 고태국 (연세대학교 전기전자공학과)
  • Published : 2003.10.01

Abstract

The sub-cooled nitrogen cooling system at 65 K with GM cryo-cooler is developed for cooling down the DC reactor of 6.6 ㎸-200 A class HTS Fault Current Limiter(SFCL). The sub-cooled nitrogen cooling is more economic than saturated nitrogen cooling, because the length of HTS wire is reduced in the same capacity, as well as, more stable. The cooling system with the GM cryo-cooler installed on the cryostat is not only compact but also efficient for energy saving. In the nitrogen vessel, after evacuating with vacuum pump to saturated nitrogen at 65 K, sub-cooled nitrogen at 65 K is made by putting in gas helium to 1 atm. During the short circuit test occurring the fault current of 1000 A, the sub-cooled nitrogen cooled DC reactor for SFCL is kept the state of sub-cooled nitrogen at 65 K.

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