Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Dielectric Insulation Properties of Double Pancake Coil Type HTS Transformer

Double Pancake Coil형 고온초전도 변압기의 전기적 절연 특성

  • 백승명 (경상대학교 전기공학과 및 공학연구원) ;
  • 정종만 (경상대학교 전기공학과 및 공학연구원) ;
  • 이현수 (마산대학 컴퓨터전기공학부) ;
  • 한철수 (경상대학교 전기공학과 및 공학연구원) ;
  • 김상현 (경상대학교 전기공학과 및 공학연구원)
  • Published : 2003.02.01
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Abstract

High temperature superconductor can only be applied against an engineering specofication that has to be determined for each particular application form the design requirements for economic viability and for operation margins in service. However, in order to realize the HTS transformer, it is necessary to establish the high voltage insulation technique in cryogenic temperature. Therefore, the composite insulation of double pancake coil type transformer are described and AC breakdown voltage characteristics of liquid nitrogen(LN$_2$) under HTS pancake coil electrode made by Bi-2223/Ag are studied. The Breakdown of LN$_2$ is dominated electrode shape and distance. The influence of pressure on breakdown voltage is discussed with th different electrode. For the electrical insulation design of turn-to-turn insulation for the HTS transformer, we tested breakdown strength of insulation sheet under varying pressure. And we investigated surface flashover properties of LN$_2$ and complex conition of cryogenic gaseous nitrogen(CGN$_2$) obove a LN$_2$ surface. The surface voltage of GFRP was measured as a function of thickness and electrode distance in LN$_2$ and complex condition of CGN$_2$ above a LN$_2$ surface. this research presented information of electrical insulation design for double pancake coil(DPC) type HTS transformer.

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References

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