Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Operational Method of Superconducting Fault Current Limiter with Reduction Function of Asymmetric Fault Current

비대칭 고장전류 저감 기능을 갖는 초전도 한류기 동작 방안

  • 김창환 (영남대학교 전기공학과) ;
  • 서훈철 (연암공업대학) ;
  • 김규호 (국립한경대학교 전기공학과) ;
  • 김철환 (성균관대 정보통신공학부, 전력IT인력양성센터) ;
  • 이상봉 (영남대학교 전기공학과)
  • Received : 2014.07.21
  • Accepted : 2014.09.11
  • Published : 2014.10.31
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Abstract

When fault currents contain decaying DC offset, the peak value of the fault current in the first cycle of the fault period is higher than the fault current during the steady-state period. To reduce the asymmetric fault current, this paper proposes an operation scheme using the series connection of two hybrid type Superconducting Fault Current Limiters (SFCLs) : an auxiliary SFCL and a main SFCL. The proposed method calculates the fault angle by comparing the zero-crossing time with fault detection time. According to the fault angle calculated, an auxiliary SFCL operates to reduce an asymmetric fault current during half a cycle after fault occurrence. After this process, the fault current is limited by a main SFCL. To confirm the usefulness of the proposed method, case studies using Electro-Magnetic Transients Program (EMTP)/Alternative Transient Program (ATP) Draw are perfomed.

Keywords

References

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