Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Difference-Blocked Current Differential Relaying Algorithm for Power Transformers

차전류 차분 방지 변압기 보호용 전류차동 계전방식

  • Kang, Y.C. (Chonbuk National University, NPT Center) ;
  • Kim, D.S. (Chonbuk National University, NPT Center) ;
  • Kim, E.S. (Chonbuk National University, NPT Center) ;
  • Won, S.H. (Chonbuk National University, NPT Center) ;
  • Lee, B.E. (Chonbuk National University, NPT Center)
  • 강용철 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 김대성 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 김은숙 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 원성호 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 이병은 (전북대학교 전자정보 공학부, 차세대전력기술연구센터)
  • Published : 2002.07.10
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Abstract

This paper proposes a difference-blocked current differential relaying algorithm for power transformers. The proposed algorithm observes that the shape of the differential current is changed using the difference. If the change is detected, output of current differential relay is blocked for a certain time. In this way, the algorithm distinguishes internal faults from magnetizing inrush. The proposed algorithm uses only currents and is unaffected by the remanent flux.

Keywords