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Enhanced Transformer Overcurrent Protection via Oil Temperature Acceleration

Author

Listed:
  • Qingguo Liu

    (State Grid Hubei Electric Power Co., Ltd., Yichang Power Supply Company, Yichang 443002, China)

  • Nuonan Mei

    (State Grid Hubei Electric Power Co., Ltd., Songzi Power Supply Company, Jingzhou 434200, China)

  • Zheng Wang

    (National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China)

  • Jiahang Sun

    (State Grid Hubei Electric Power Co., Ltd., Yichang Power Supply Company, Yichang 443002, China)

  • Shanshan Zhou

    (National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China)

Abstract

When a transformer is in a long-term heavy load operation state, the oil temperature reaches the alarm temperature; if a slight fault occurs inside the transformer, traditional inverse time current protection and other protections that react to phase current may not operate due to insufficient sensitivity or they may operate for too long. Based on this, this article proposes a new principle of accelerating inverse time overcurrent protection based on transformer oil temperature. The proposed method uses transformer oil temperature to accelerate the action time of traditional inverse-time overcurrent protection, then introduces the transformer oil temperature factor and acceleration index to optimize the inverse time characteristic curve, and establishes a mathematical model to optimize the adjustment for the complexity of adjustment of the protection action equation and the risk of mismatch of the protection after the acceleration of oil temperature. The existing theoretical analysis and simulation verification results show that the proposed new overcurrent protection scheme based on the transformer oil temperature acceleration inverse time can effectively improve the protection of the rapidity and sensitivity, providing a new research idea for the combination of non-electrical and electrical quantity protection.

Suggested Citation

  • Qingguo Liu & Nuonan Mei & Zheng Wang & Jiahang Sun & Shanshan Zhou, 2024. "Enhanced Transformer Overcurrent Protection via Oil Temperature Acceleration," Energies, MDPI, vol. 17(19), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:19:p:4916-:d:1490160
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    References listed on IDEAS

    as
    1. Dagar, Annu & Gupta, Pankaj & Niranjan, Vandana, 2021. "Microgrid protection: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
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