KIEE International Transactions on Power Engineering

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

Design of a CT Saturation Detection Technique with the Countermeasure for a Spike Signal

  • Kang, Yong-Cheol (Division of Electronics and Information Engineering, Chonbuk National Univ.) ;
  • Yun, Jae-Sung (Division of Electronics and Information Engineering, Chonbuk National Univ.)
  • 발행 : 2003.06.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

When a current transformer (CT) is saturated, the wave-shape of the secondary current is distorted and contains points of inflection, which correspond to the start or end of each saturation period. Discontinuity in the first-difference function of the current arises at points of inflection, where the second and third differences convert into pulses that can be used to detect saturation. This paper describes the design and evaluation of a CT saturation detection technique using the third-difference function and includes the countermeasure for a spike signal. Test results clearly demonstrate that the algorithm successfully detects the start and end of each saturation period irrespective of the remanent flux and magnetization inductance in the saturated region. This paper concludes by describing the results of hardware implementation of the algorithm using a DSP.

키워드

참고문헌

  1. A. G. Phadke and J. S. Thorp, Computer Relaying for Power Systems, Research Studies Press LTD., 1988, pp. 185-186
  2. Y. C. Kang, J. K. Park, S. H. Kang, A. T. Johns, and R K. Aggarwal, 'An Algorithm for Compensating the Secondary Current of Current Transformers,' IEEE Trans. on PWRD, Vol. 12, No.1, January 1997, pp. 116-124
  3. 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
  4. Y. C. Kang, S. H. Ok, J. S. Yun, and S. H. Kang, 'Perfonnance Analysis of a Lowpass Filter on a CT Saturation Detection Algorithm,' Trans. KIEE A, Vol. 51, No. 10, October 2002, pp. 495-501
  5. S. H. Horowitz and A. G. Phadke, Power System Relaying, Research Studies Press LTD., 1992, pp. 56-57
  6. M. Kezunovic, L. Kojovic, A. Abur, C. W. Fromen, and F. Phillips, 'Experimental Evaluation of EMTPBased Current Transformer Models for Protective Relay Transient Study,' IEEE Trans. PWRD, Vol. 9, No. 1, January 1994, pp. 405-413