Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Current Differential Relaying Algorithm for Power Transformers Using an Advanced Compensation Algorithm of CTs

잔류자속에 무관한 전류보상 알고리즘을 적용한 변압기 보호용 전류차동 계전방식

  • Kang, Y.C. (Chonbuk National University, NPT Center) ;
  • Lim, U.J. (Chonbuk National University, NPT Center) ;
  • Yun, J.S. (Chonbuk National University, NPT Center) ;
  • Jin, E.S. (Chonbuk National University, NPT Center) ;
  • Won, S.H. (Chonbuk National University, NPT Center)
  • 강용철 (전북대학교 전자정보공학부, 차세대전력기술연구센터) ;
  • 임의재 (전북대학교 전자정보공학부, 차세대전력기술연구센터) ;
  • 윤재성 (전북대학교 전자정보공학부, 차세대전력기술연구센터) ;
  • 김은숙 (전북대학교 전자정보공학부, 차세대전력기술연구센터) ;
  • 원성호 (전북대학교 전자정보공학부, 차세대전력기술연구센터)
  • Published : 2003.07.21
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Abstract

To prevent maloperation during magnetic inrush and over-excitation, a current differential relay for power transformers uses harmonic current based restraining or blocking scheme; it also uses dual slope characteristics to prevent maloperation for an external fault with CT saturation. This paper proposes a current differential relaying algorithm for power transformers with an advanced compensation algorithm for the secondary current of CTs. The comparative study was conducted with and without the compensating algorithm. The algorithm can reduce the operating time of the relay in the case of an internal fault and improve security for external faults.

Keywords