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Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Author

Listed:
  • Chen Wei

    (School of Automation, Wuhan University of Technology, Wuhan 430070, China)

  • Xianqiang Li

    (School of Automation, Wuhan University of Technology, Wuhan 430070, China)

  • Ming Yang

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Zhiyuan Ma

    (School of Automation, Wuhan University of Technology, Wuhan 430070, China)

  • Hui Hou

    (School of Automation, Wuhan University of Technology, Wuhan 430070, China)

Abstract

The remanence (residual flux) in the core of power transformers needs to be determined in advance to eliminate the inrush current during the process of re-energization. In this paper, a novel method is proposed to determine the residual flux based on the relationship between residual flux and the measured magnetizing inductance. The paper shows physical, numerical, and analytical explanations on the phenomenon that the magnetizing inductance decreases with the increase of residual flux under low excitation. Numerical simulations are performed by EMTP (Electro-Magnetic Transient Program) on a 1 kVA power transformer under different amounts of residual flux. The inductance–remanence curves are nearly the same when testing current changes. Laboratory experiments conducted on the same transformer are in line with the numerical simulations. Furthermore, numerical simulation results on a 240 MVA are reported to demonstrate the effectiveness of the proposed method.

Suggested Citation

  • Chen Wei & Xianqiang Li & Ming Yang & Zhiyuan Ma & Hui Hou, 2019. "Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements," Energies, MDPI, vol. 12(24), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4616-:d:294360
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    Cited by:

    1. Wenqi Ge & Chenchen Zhang & Yi Xie & Ming Yu & Youhua Wang, 2021. "Analysis of the Electromechanical Characteristics of Power Transformer under Different Residual Fluxes," Energies, MDPI, vol. 14(24), pages 1-22, December.

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