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Numerical Analysis of Electric Field in Oil-Immersed Current Transformer with Metallic Particles Inside Main Insulation

Author

Listed:
  • Wei Lou

    (State Grid Corporation of China, East China Branch, Shanghai 200120, China)

  • Bo Lu

    (State Grid Corporation of China, East China Branch, Shanghai 200120, China)

  • Youxiang Pan

    (Anhui Nanrui Zhongtian Electric Power Electronics Co., Ltd., Hefei 230061, China)

  • Zhou Han

    (Anhui Nanrui Zhongtian Electric Power Electronics Co., Ltd., Hefei 230061, China)

  • Lujia Wang

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

During the manufacturing process of oil-immersed current transformers, metallic particles may become embedded in the insulation wrapping, and the resulting electric field distortion is one of the primary causes of failure. Historically, the shape of metallic particles has often been simplified to a standard sphere, whereas in practice, these particles are predominantly irregular. In this study, ellipsoidal and flaky particles were selected to represent smooth and angular surfaces, respectively. Using COMSOL Multiphysics ® (version 6.2) software, a three-dimensional simulation model of an oil-immersed inverted current transformer was developed, and the influence of defect position and size on electric field characteristics was analyzed. The results indicate that both types of defects cause electric field distortion, with longer particles exerting a greater influence on the electric field distribution. Under the voltage of a 220 kV system, elliptical particles (9 mm half shaft) lead to the maximum electric field intensity of main insulation of up to 45.1 × 10 6 V/m, while the maximum field strength of flaky particles (length 30 mm) is 28.9 × 10 6 V/m. Additionally, the closer the particles are to the inner side of the main insulation, the more significant their influence on the electric field distribution becomes. The findings provide a foundation for fault analysis and propagation studies related to the main insulation of current transformers.

Suggested Citation

  • Wei Lou & Bo Lu & Youxiang Pan & Zhou Han & Lujia Wang, 2025. "Numerical Analysis of Electric Field in Oil-Immersed Current Transformer with Metallic Particles Inside Main Insulation," Energies, MDPI, vol. 18(14), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:14:p:3628-:d:1697981
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    References listed on IDEAS

    as
    1. Hanhua Luo & Duohu Gong & Shan Li & Zhongqiang Zhan & Niyaer Di & Dilyar Dolkun & Xianhao Fan & Xiangdong Liu, 2024. "Suppression of Metal Particles by Coating for a ±550 kV DC GIS," Energies, MDPI, vol. 17(22), pages 1-14, November.
    2. Kayumba Grace Ilunga & Andrew Graham Swanson & Nelson Ijumba & Robert Stephen, 2025. "Influence of Conductor Temperature on the Voltage–Current Characteristic of Corona Discharge in a Coaxial Arrangement—Experiments and Simulation," Energies, MDPI, vol. 18(5), pages 1-24, March.
    3. Jai-Houng Leu & Ay Su & Shun-Chi Kuo & Kuang-Chung Chen, 2024. "The Observation of Performance Trends by Numerical Simulation with Different Parameters in a Nonlinear Reversible Solid Oxide Cell System," Energies, MDPI, vol. 17(23), pages 1-13, December.
    4. Junping Zhao & Zhengjie An & Bin Lv & Zhicheng Wu & Qiaogen Zhang, 2020. "Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator," Energies, MDPI, vol. 13(10), pages 1-11, May.
    5. Yong Liu & Bowen Xia & Boxue Du & Masoud Farzaneh, 2016. "Influence of Fine Metal Particles on Surface Discharge Characteristics of Outdoor Insulators," Energies, MDPI, vol. 9(2), pages 1-13, January.
    6. Rui Yao & Meng Hui & Jun Li & Lin Bai & Qisheng Wu, 2018. "A New Discharge Pattern for the Characterization and Identification of Insulation Defects in GIS," Energies, MDPI, vol. 11(4), pages 1-18, April.
    7. Wenqu Wang & Yu Gao & Huicun Zhao, 2022. "The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating," Energies, MDPI, vol. 15(13), pages 1-13, June.
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