Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Measurement & Analysis of Transport Current AC loss in Coated Conductor Bifilar Structure

Coated Conductor의 Bifilar 구조에서의 통전 교류 손실 측정 및 해석

  • 방주석 (연세대 대학원 전기전자공학과) ;
  • 박동근 (연세대 대학원 전기전자공학과) ;
  • 심기덕 (한국전기연구원 초전도응용연구그룹) ;
  • 장기성 (연세대 대학원 전기전자공학과) ;
  • 양성은 (연세대 대학원 전기전자공학과) ;
  • 안민철 (기초전력연구원) ;
  • 강형구 (현대중공업 기계전기연구소) ;
  • 석복렬 (현대중공업 기계전기연구소) ;
  • 고태국 (연세대 전기전자공학과)
  • Published : 2007.03.31
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Abstract

Superconductor is weak in AC condition. Bifilar geometry provides a solution to reduce AC loss. Bifialr geometry is piled up or wound with more than two layers. When a layer of superconductor abuts on other layers, AC loss is affected by not only self-field, but also magnetic field induced by adjacent layers. In this study, two superconductors are piled up as a series connection so that current flows in different directions. By this method, magnetic field is cancelled. If magnetic field is cancelled, AC loss is reduced. To compare AC loss with respect to piling method, we measured the AC loss difference between the case facing each other with substrate side and the case facing with YBCO side. Measured AC loss is compared with one-way current flow single layer AC loss. In addition, we analyzed how much AC loss was increased, or reduced. All results were compared with those calculated with Norris equation. By this experiment, we concluded that distance between two wires is the important cause of AC loss. The distance between two wires affects magnetic field reduction in YBCO and induced current flow on substrate side.

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References

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