Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Investigation into Transformer Protective Relay Setting Rule Considering Error Ratio

오차를 고려한 765kV 변압기 보호 계전 정정룰 고찰

  • Bae, Y.J. (Next-Generation Power Technology Center in Myonji University) ;
  • Lee, S.J. (Next-Generation Power Technology Center in Myonji University) ;
  • Choi, M.S. (Next-Generation Power Technology Center in Myonji University) ;
  • Kang, S.H. (Next-Generation Power Technology Center in Myonji University) ;
  • Kim, S.T. (Next-Generation Power Technology Center in Myonji University) ;
  • Choi, J.L. (Next-Generation Power Technology Center in Myonji University) ;
  • Jeong, C.H. (Next-Generation Power Technology Center in Myonji University) ;
  • Yoo, Y.S. (Korea Power Exchange) ;
  • Cho, B.S. (Korea Power Exchange)
  • 배영준 (명지대학교 차세대전력기술연구센터) ;
  • 이승재 (명지대학교 차세대전력기술연구센터) ;
  • 최면송 (명지대학교 차세대전력기술연구센터) ;
  • 강상희 (명지대학교 차세대전력기술연구센터) ;
  • 김상태 (명지대학교 차세대전력기술연구센터) ;
  • 최정이 (명지대학교 차세대전력기술연구센터) ;
  • 정창현 (명지대학교 차세대전력기술연구센터) ;
  • 유영식 (한국전력거래소) ;
  • 조범섭 (한국전력거래소)
  • Published : 2002.07.10
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Abstract

The digital current differential relaying scheme is widely used for primary protection of 765(kV) power transformer. The current differential relay pickup the internal fault at the threshold which is set at 30% of rating current. Margin of 30% include current transformer error 5%, relay error 5%, on load tap changer error 7% and margin factor 140% obtained from the field experience. In this paper transformer protection relay and relay setting rule of high voltage power system are discussed. And we verify the correctness of relay setting rule with current differential relay using Matlab simulation.

Keywords