Operational Characteristics of Transformer-Type SFCL with or without Neutral Line between the Secondary windings and Superconducting units

2차 권선과 초전도 사이의 중성선 유무에 따른 변압기형 초전도 한류기의 동작특성

  • 조용선 (조선대 공대 전기공학과) ;
  • 최효상 (조선대 공대 전기공학과) ;
  • 고성필 (한국폴리텍I대학 제주캠퍼스 신재생에너지학과)
  • Received : 2011.03.11
  • Accepted : 2011.05.13
  • Published : 2011.06.01


The study on power capacity increase of superconducting fault current limiter (SFCL) is one of the most important researches to apply a SFCL in the power system. To achieve this, we thought that the unbalanced quenching problem generated in series connection of superconducting units should be solved. In this paper, we investigated the quenching characteristics of superconducting units in the transformer-type SFCL with or without the neutral line between secondary windings and superconducting units. In case of transformer-type SFCL without neutral line, the connection structure of superconducting units is identical to that of the resistive-type SFCL connected in series. Therefore, the unbalanced quenching was occurred by difference of critical current between superconducting units. However, in case of transformer-type SFCL with neutral line, the superconducting units with different critical current were simultaneously quenched. It was because the currents induced by secondary winding were separately flowed through the superconducting units. By these results, we confirmed that the resistances and consumption powers of the superconducting units were equally generated.


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