대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)

대한전기학회 (The Korean Institute of Electrical Engineers)
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비선형 자화특성을 고려한 3상 변압기 보호용 전류차동 계전방식

A Current Differential Relaying Algorithm for Three-Phase Transformer Considering the Nonlinear Magnetization Characteristics of the Core

  • 강용철 (전북대학교, 차세대전력기술연구센터) ;
  • 김은숙 (전북대학교, 차세대전력기술연구센터) ;
  • 원성호 (전북대학교, 차세대전력기술연구센터) ;
  • 임의재 (전북대학교, 차세대전력기술연구센터) ;
  • 강상희 (명지대학교, 차세대전력기술연구센터)
  • Kang, Y.C. (Chonbuk National University, NPT Center) ;
  • Jin, E.S. (Chonbuk National University, NPT Center) ;
  • Won, S.H. (Chonbuk National University, NPT Center) ;
  • Lim, U.J. (Chonbuk National University, NPT Center) ;
  • Kang, S.H. (Myongji University, NPT Center)
  • 발행 : 2003.07.21
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초록

This paper describes a current differential relaying algorithm for a three-phase transformer considering the nonlinear magnetization characteristics of the core. The iron-loss current is obtained from the calculated induced voltage and the core-loss resistance. The magnetizing current is calculated from the estimated core flux and the magnetization curve. The proposed algorithm uses the modified differential current, which is obtained by subtracting the iron-loss current and the magnetizing current from the conventional differential current. The various test results show that the algorithm can discriminate internal fault from magnetic inrush, overexcitation and an external fault.

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