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Development Processes of Surface Trucking and Partial Discharge of Pressboards Immersed in Mineral Oil: Effect of Tip Curvatures

Author

Listed:
  • Bo Gao

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Rui Yu

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Guangcai Hu

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Cheng Liu

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Xin Zhuang

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Peng Zhou

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

Abstract

The pressboard surface is the electric weak link of the oil-paper insulation in transformers, and long-term partial discharge (PD) erosion is the dominant cause of degradation in pressboard. To explore the development processes of surface tracking under the effect of tip curvature, the typical needle-plate model was selected to initiate an electric field with a high tangential component on pressboard surface under needle tip curvature of 4~42 μm. With the help of a high-speed camera and a PD detecting system, the development processes of surface tracking and PD were recorded under a sustained AC voltage. A profound difference between surface tracking under different curvatures was discussed. Pressboard surfaces after tests were observed under a scanning electron microscope (SEM), and the damage degree of cellulose fibers was dependent on the tip curvature.

Suggested Citation

  • Bo Gao & Rui Yu & Guangcai Hu & Cheng Liu & Xin Zhuang & Peng Zhou, 2019. "Development Processes of Surface Trucking and Partial Discharge of Pressboards Immersed in Mineral Oil: Effect of Tip Curvatures," Energies, MDPI, vol. 12(3), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:554-:d:204847
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    References listed on IDEAS

    as
    1. Wojciech Sikorski & Krzysztof Walczak & Piotr Przybylek, 2016. "Moisture Migration in an Oil-Paper Insulation System in Relation to Online Partial Discharge Monitoring of Power Transformers," Energies, MDPI, vol. 9(12), pages 1-16, December.
    2. Qingguo Chen & Jinfeng Zhang & Minghe Chi & Chong Guo, 2018. "Breakdown Characteristics of Oil-Pressboard Insulation under AC-DC Combined Voltage and Its Mathematical Model," Energies, MDPI, vol. 11(5), pages 1-13, May.
    3. Xiaobo Wang & Chao Tang & Bo Huang & Jian Hao & George Chen, 2018. "Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers," Energies, MDPI, vol. 11(3), pages 1-31, February.
    4. Jian Hao & Runhao Zou & Ruijin Liao & Lijun Yang & Qiang Liao, 2018. "New Method for Shallow and Deep Trap Distribution Analysis in Oil Impregnated Insulation Paper Based on the Space Charge Detrapping," Energies, MDPI, vol. 11(2), pages 1-16, January.
    5. Qingguo Chen & Jiaxin Sun & Minghe Chi & Jinfeng Zhang & Peng Tan, 2018. "Experimental Study on Trap Characteristics of Nano-Montmorillonite Composite Pressboards," Energies, MDPI, vol. 11(7), pages 1-9, July.
    6. Guoqiang Xia & Guangning Wu & Bo Gao & Haojie Yin & Feibao Yang, 2017. "A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy," Energies, MDPI, vol. 10(8), pages 1-15, August.
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