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Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Author

Listed:
  • Chunxu Qin

    (School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China)

  • Yan He

    (School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China)

  • Bing Shi

    (School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China)

  • Tao Zhao

    (Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China)

  • Fangcheng Lv

    (Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China)

  • Xiangrui Cheng

    (Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China)

Abstract

Bubbles will reduce the electric strength of transformer oil, and even result in the breakdown of the insulation. This paper has studied the breakdown voltages of transformer oil and oil-impregnated pressboard under alternating current (AC) and direct current (DC) voltages. In this paper, three types of electrodes were applied: cylinder-plan electrodes, sphere-plan electrodes, and cone-plan electrodes, and the breakdown voltages were measured in both no bubbles and bubbles. The sphere-sphere electrodes were used to study the breakdown voltage of the oil-impregnated pressboard. The results showed that under the influence of bubble, the breakdown voltage of the cylinder-plan electrode dropped the most, and the breakdown voltage of the cone-plan electrode dropped the least. The bubbles motion was the key factor of the breakdown. The discharge types of the oil-impregnated pressboard were different with bubbles, and under DC, the main discharge type was flashover along the oil-impregnated pressboard, while under AC, the main discharge type was breakdown through the oil-impregnated pressboard.

Suggested Citation

  • Chunxu Qin & Yan He & Bing Shi & Tao Zhao & Fangcheng Lv & Xiangrui Cheng, 2018. "Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles," Energies, MDPI, vol. 11(3), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:634-:d:136048
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    Citations

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    Cited by:

    1. Issouf Fofana & U. Mohan Rao, 2018. "Engineering Dielectric Liquid Applications," Energies, MDPI, vol. 11(10), pages 1-4, October.
    2. Kamil Lewandowski & Hubert Moranda & Radoslaw Szewczyk, 2023. "Bubble Effect Phenomenon in Modern Transformer Insulation Systems Using Aramid-Based Materials and Alternative Insulating Liquids," Energies, MDPI, vol. 16(14), pages 1-15, July.

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