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Saturation Detection-Based Blocking Scheme for Transformer Differential Protection

Author

Listed:
  • Byung Eun Lee

    (Wind Energy Grid-Adaptive Technology Research Centre, Chonbuk National University, Chonju 561-756, Korea)

  • Jinsik Lee

    (Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology Research Centre, Chonbuk National University, Chonju 561-756, Korea)

  • Sung Ho Won

    (Korea Electrical Contractors Association, #533-2, Deungchon-2Dong, Gangseo-Ku, Seoul 157-718, Korea)

  • Byongjun Lee

    (Department of Electrical Engineering, Korea University, Seoul 136-701, Korea)

  • Peter A. Crossley

    (The School of Electrical & Electronic Engineering, the University of Manchester, Manchester M13 9PL, UK)

  • Yong Cheol Kang

    (Department of Electrical Engineering, Wind Energy Grid-Adaptive Technology Research Centre and Smart Grid Research Centre, Chonbuk National University, Chonju 561-756, Korea)

Abstract

This paper describes a current differential relay for transformer protection that operates in conjunction with a core saturation detection-based blocking algorithm. The differential current for the magnetic inrush or over-excitation has a point of inflection at the start and end of each saturation period of the transformer core. At these instants, discontinuities arise in the first-difference function of the differential current. The second- and third-difference functions convert the points of inflection into pulses, the magnitudes of which are large enough to detect core saturation. The blocking signal is activated if the third-difference of the differential current is larger than the threshold and is maintained for one cycle. In addition, a method to discriminate between transformer saturation and current transformer (CT) saturation is included. The performance of the proposed blocking scheme was compared with that of a conventional harmonic blocking method. The test results indicate that the proposed scheme successfully discriminates internal faults even with CT saturation from the magnetic inrush, over-excitation, and external faults with CT saturation, and can significantly reduce the operating time delay of the relay.

Suggested Citation

  • Byung Eun Lee & Jinsik Lee & Sung Ho Won & Byongjun Lee & Peter A. Crossley & Yong Cheol Kang, 2014. "Saturation Detection-Based Blocking Scheme for Transformer Differential Protection," Energies, MDPI, vol. 7(7), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:7:p:4571-4587:d:38288
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    Citations

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    Cited by:

    1. Zhou Ruhan & Nurulafiqah Nadzirah Binti Mansor & Hazlee Azil Illias, 2023. "Identification of Inrush Current Using a GSA-BP Network," Energies, MDPI, vol. 16(5), pages 1-22, February.
    2. Ying Zhu & Yuping Li & Jianbin Sang & Minglei Bao & Haixiang Zang, 2018. "Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection," Energies, MDPI, vol. 11(6), pages 1-15, June.

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