Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Transformer protective Relaying Algorithm Based on Increment of Flux Linkages

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  • Kang, Y.C. (Chonbuk National University, NPT Center) ;
  • Lee, B.E. (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)
  • 강용철 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 이병은 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 김은숙 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 원성호 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
  • 임의재 (전북대학교 전자정보 공학부, 차세대전력기술연구센터)
  • Published : 2003.07.21
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Abstract

This paper propose a transformer protective relaying algorithm based on the increment of flux linkages (RIFL) of the Primary and secondary windings. The RIFL is equal to the turn ratio for all operating conditions except an internal faults. For a single-phase transformer and three-phase Y-Y transformer, the increments of flux linkages are calculated and their ratios are compared with the turn ratio. For a three-phase Y-$\triangle$ transformer, the difference of the increments of flux linkages are calculated to use the line currents instead of the delta winding currents, which are practically unavailable. Their ratios are compared with the turn ratio. The results of various tests show that the algorithm successfully discriminates internal faults from normal operation conditions such as magnetic inrush and overexcitation. The algorithm can not only detect internal winding faults, but reduce the relay's operating time.

Keywords