The Transactions of the Korean Institute of Electrical Engineers A (대한전기학회논문지:전력기술부문A)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Current Differential Relaying Algorithm for Bus Protection Using a Compensating Algorithm of Secondary Currents of CTs

변류기 전류보상 알고리즘을 이용한 모선보호용 전류 차동계전 알고리즘

  • 강용철 (전북대 공대 전자정보공학부·) ;
  • 윤재성 (전북대 공대 대학원 전기공학과) ;
  • 김동용 (전북대 공대 전자정보공학부·)
  • Published : 2000.09.01
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Abstract

A conventional variable percentage current differential relaying algorithm for bus protection may misoperate for external faults with severe CT saturation and internal faults with high impedance. This paper proposes a percentage differential current relaying algorithm for bus protection combined with a compensating algorithm of secondary currents of CTs. Even though CTs are saturated and their secondary currents are severely distorted, the proposed relaying algorithm does not only misoperate for external faults with CT saturation but also detects the internal faults with high fault impedance. Thus, the method improves the sensitivity of the relays and does not require any counterplan for CT saturation.

Keywords

References

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