일체화된 삼상 자속구속형 고온초전도 전류제한기의 사고각에 따른 전류제한 특성 분석

Analysis of Current Limiting Characteristics According to Fault Angles in Integrated Three-Phase Flux-Lock Type Superconducting Fault Current Limiting

  • 박충렬 (전북대학교 전기공학과) ;
  • 두호익 (전북대학교 전기공학과) ;
  • 임성우 (한전 전력연구원 전략기술연구소) ;
  • 현옥배 (한전 전력연구원 전략기술연구소) ;
  • 임성훈 (숭실대학교 전기공학부) ;
  • 박형민 (조선대학교 전기공학과) ;
  • 조용선 (조선대학교 전기공학과) ;
  • 남긍현 (조선대학교 전기공학과) ;
  • 이나영 (조선대학교 전기공학과) ;
  • 최효상 (조선대학교 전기공학과) ;
  • 한병성 (전북대학교 전기공학과)
  • 발행 : 2006.06.22

초록

In this paper, we investigated the. characteristics of fault current limiting according to fault angle in the integrated three-phase flux-lock type SFCL in fault types such as the single-line-to-ground fault, the double-line-to-ground fault and the three-line-to-ground fault. When the SFCL is operating under normal condition, the magnetic flux generated between primary and secondary coils of each single phase is canceled out perfectly, so that the impedance of the SFCL is also not generated and the power system can be operated normally without any loss, However, if a fault occurs even in any phase out of three phases, quench happened in SFCL elements and the current flowing secondary coil is restricted abruptly. Finally, the balance of magnetic flux in whole SFCL system is destroyed, and the fault currents in every phase could be limited at the same time irrespective of the fault types. As a result, the developed SFCL in this study were operated normally as expected and the purpose of the integration of 3 phase current limiting was also achieved successfully. However, the fault current limiting characteristics of the SFCL was dependant on the quench characteristics of HTSC elements in each phase, and it was expected that the improvement of the SFCL could be possible through the introduction of HTSC elements which have better critical characteristics.

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