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

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

변류기 포화 곤단 알고리즘으로 억제된 모선보호용 비율 전류차동 계전방식

A Percentage Current Differential Relaying Algorithm for Bus Protection Blocked by a CT Saturation Detection Algorithm

  • 발행 : 2003.01.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This paper describes a percentage current differential relaying algorithm for bus protection blocked by a CT saturation detection algorithm. The detection algorithm blocks the output of a current differential relay only if a differential current is caused by CT saturation in the case of an external fault. Moreover, if a current differential relay operates faster than the detection algorithm, the blocking signal is not ignited. On the other hand. if the detection algorithm operates faster than a current differential relay, the output of the relay is blocked. The results of the simulation show that the proposed algorithm can discriminate internal faults from external faults ever when a CT is saturated in both cases. This paper concludes by implementing the algorithm into the TMS320C6701 digital signal processor. The results of hardware implementation are also satisfactory The algorithm can not only increase the sensitivity of the current differential relay but Improve the stability of the relay for an external faults.

키워드

참고문헌

  1. F. Andow, N. Suga, Y. Murakamy, and K. Inamura, 'Microprocessor-based busbar protection relay', IEE Fifth International Conference on Developments in Power System Protection, Mar. 1993
  2. A. Kumar and P. Hansen, 'Digital bus-zone protection', IEEE Computer Applications in Power, Vol. 6, No. 4, Oct. 1993, pp.29-34 https://doi.org/10.1109/67.238202
  3. M.S. Sachdev, T.S. Sidhu, H.S. Gill, 'A busbar protection technique and its performance during CT saturation and CT ratio-mismatch', IEEE Trans. on PWRD, Vol. 15, No. 3, July 2000, pp.895-901 https://doi.org/10.1109/61.871349
  4. C. Fernandez, 'An Impedance-Based CT Saturation Detection Algorithm for Bus-Bar Differential Protection', IEEE Trans. on PWRD, Vol. 16, No. 4, October 2001, pp.468-472 https://doi.org/10.1109/61.956722
  5. 강용철, 윤재성, 김동룡, '변류기 전류보상 알고리즘을 이용한 모선보호용 전류 차동계전 알고리즘', 전기학회논문지 A, 제49권 제9호, 2000년 9월, pp. 446-450
  6. Y. C. Kang, S. H. Ok, S. H. Kang, 'A Novel CT Saturation Detecting Algorithm Unaffected by a Remanent Flux', IEEE PES 2001 SM, July 15-29, 2001, Vancouver, BC, Canada https://doi.org/10.1109/PESS.2001.970268