The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

A Joining Method between HTS Double Pancake Coils

고온초전도 더블 팬케이크 코일들 사이의 접합 방법

  • 손명환 (한국전기연구원 초전도응용연구그룹) ;
  • 심기덕 (한국전기연구원 초전도응용연구그룹) ;
  • 김석호 (한국전기연구원 초전도응용연구그룹) ;
  • 김해종 (한국전기연구원 초전도응용연구그룹) ;
  • 배준한 (한국전기연구원 초전도응용연구그룹) ;
  • 이언용 (한국전기연구원 초전도응용연구그룹) ;
  • 민치현 (경상대학교 공대 전기공학과) ;
  • 성기철 (한국전기연구원 초전도응용연구그룹)
  • Published : 2006.12.01
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Abstract

High temperature superconductor (HTS) winding coil is one of the key component in superconducting device fabrication. Double-pancake style coils are widely used for such application. High resistance between pancake coils greatly affects the machine design, operating condition and thus the stability. In order to reduce such resistance, experimentalists are looking for efficient and damage free coil connecting methods. In this respect, here we proposed parallel joining method to connect the coils. This is to do crossly joining with HTS tapes on two parallel HTS tapes. Joint samples between two parallel HTS tapes were prepared by using HTS tapes and current-voltage (I-V) characteristic curves were investigated at liquid nitrogen temperature i.e., 77.3 K. A 20 cm length joint connected between two parallel HTS tapes shows $32.5n{\Omega}$, for currents up to 250 A. A small HTS magnet, having two double pancake sub-coils connected together through new parallel joint method was fabricated and their current-voltage (I-V) characteristic curve was investigated. At 77.3K, critical current(Ic) of 97 A and resistance of $55n{\Omega}$ for currents upto 130 A were measured. At operating current 86 A lower than Ic, Joule heats generated in whole magnet and at joint region between sub-coils were 226 mW and 0.4 mW, respectively. Low Joule heat generation suggests that this joining method may be used to fabricate HTS magnet or windings.

Keywords

References

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