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

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Three-Winning Transformer Protection Based on Flux Linkage Ratio

쇄교자속비를 이용한 3권선 변압기 보호

  • Published : 2004.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper describes a three-winding transformer protective relaying algorithm based on the ratio of increments of flux linkages (RIFL). To minimize the approximation errors, the algorithm uses integration approximation. The RIFL of the two windings is equal to the turns ratio for all operating conditions except for an internal fault. For a single-phase and three-phase transformer containing the wye-connected windings, the increments of flux linkages (IFL) are calculated. For a three-phase transformer containing the delta-connected windings, the difference of IFL between the two phases are calculated to use the line currents, because the winding currents are practically unavailable. Their ratios are compared with the turns ratio. The comparative study between the proposed and differential approximation methods was conducted. The test results show that the algorithm can reduce the errors resulting from the conventional methods.

Keywords

References

  1. A.G. Phadke, and J.S. Thorp, Computer Relaying for Power Systems, Research Studies Press LTD., 1988
  2. C. D. Hayward, 'Harmonic-Current-Restrained Relays for Transformer Differential Protection,' AIEE Trans. vol. 50, pp. 377-332, 1941
  3. C. W. Mathews, 'An improved transformer differential relay,' AIEE Trans. Part III, vol. 73, pp. 645-650, Jun. 1954
  4. R. L. Sharp, and W. E. Glassburn, 'A Transformer Differential Relay with Second-Harmonic Restraint,' AIEE Trans. Part III, vol. 77, pp. 913-918, 1958
  5. C. H. Einvall, and J. R. Linders, 'A Three-phase Differential Relay for Transformer Protection,' IEEE Trans. on PAS, vol. 94, no. 6, pp. 1971-1980, Nov./Dec. 1975 https://doi.org/10.1109/T-PAS.1975.32043
  6. B. Al-Fakhri, I. A. Elagtal, 'A Unique Current Differential based Algorithm for Protection of Three-Winding Transformers and Busbars,' IEEE PES, 2001 WM, vol. 2 https://doi.org/10.1109/PESW.2001.916937
  7. M. S. Sachdev, T. S. Sidhu and H. C. Wood, 'A Digital Relaying Algorithm for Detection Transformer Winding Faults,' IEEE Trans. on PWRD, vol. 4 no. 3, pp. 1638-1648, Jul. 1989 https://doi.org/10.1109/61.32654
  8. 강용철, 이병은, '유기 전압비를 이용한 변압기 보호 계전 알고리즘,' 전기학회 논문지 A, 제49권 제10호, pp.524-530, 2000년 10월
  9. 강용철, 이병은, '유기 전압비를 이용한 3권선 변압기 보호 계전 알고리즘,' 전기학회 논문지 A, 제52권 제3호, pp. 173-178, 2000년 3월
  10. 강용철, 이병은, 김은숙, 원성호, '쇄교자속비를 이용한 변압기 보호,' 전기학회 논문지 A, 제52권 제11호, pp. 655-660, 2003년 11월
  11. P. Bastard. P. Bertrand. and M. Meunier, 'A Transformer Model for Winding Fault Studies,' IEEE Trans. on PWRD. vol. 9, no. 2. pp. 690-699, April 1994 https://doi.org/10.1109/61.296246