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New Method for Shallow and Deep Trap Distribution Analysis in Oil Impregnated Insulation Paper Based on the Space Charge Detrapping

Author

Listed:
  • Jian Hao

    (The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Runhao Zou

    (The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Ruijin Liao

    (The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Lijun Yang

    (The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Qiang Liao

    (College of Power Engineering, Chongqing University, Chongqing 400044, China)

Abstract

Space charge has close relation with the trap distribution in the insulation material. The phenomenon of charges trapping and detrapping has attracted significant attention in recent years. Space charge and trap parameters are effective parameters for assessing the ageing condition of the insulation material qualitatively. In this paper, a new method for calculating trap distribution based on the double exponential fitting analysis of charge decay process and its application on characterizing the trap distribution of oil impregnated insulation paper was investigated. When compared with the common first order exponential fitting analysis method, the improved dual-level trap method could obtain the energy level range and density of both shallow traps and deep traps, simultaneously. Space charge decay process analysis of the insulation paper immersed with new oil and aged oil shows that the improved trap distribution calculation method can distinguish the physical defects and chemical defects. The trap density shows an increasing trend with the oil ageing, especially for the deep traps mainly related to chemical defects. The greater the energy could be filled by the traps, the larger amount of charges could be trapped, especially under higher electric field strength. The deep trap energy level and trap density could be used to characterize ageing. When one evaluates the ageing condition of oil-paper insulation using trap distribution parameters, the influence of oil performance should not be ignored.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:271-:d:128326
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    References listed on IDEAS

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    1. Chao Tang & Bo Huang & Miao Hao & Zhiqiang Xu & Jian Hao & George Chen, 2016. "Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques," Energies, MDPI, vol. 9(1), pages 1-35, January.
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    Cited by:

    1. Yuanwei Zhu & Shengtao Li & Daomin Min & Shijun Li & Huize Cui & George Chen, 2018. "Space Charge Modulated Electrical Breakdown of Oil Impregnated Paper Insulation Subjected to AC-DC Combined Voltages," Energies, MDPI, vol. 11(6), pages 1-16, June.
    2. 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.
    3. Qingguo Chen & Jinfeng Zhang & Minghe Chi & Peng Tan & Wenxin Sun, 2018. "Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage," Energies, MDPI, vol. 11(9), pages 1-13, August.
    4. Runhao Zou & Jian Hao & Ruijin Liao, 2019. "Space/Interface Charge Analysis of the Multi-Layer Oil Gap and Oil Impregnated Pressboard Under the Electrical-Thermal Combined Stress," Energies, MDPI, vol. 12(6), pages 1-18, March.
    5. Zhaoliang Xing & Zhenlu Gu & Chong Zhang & Shaowei Guo & Huize Cui & Qingquan Lei & Guochang Li, 2022. "Influence of Space Charge on Dielectric Property and Breakdown Strength of Polypropylene Dielectrics under Strong Electric Field," Energies, MDPI, vol. 15(12), pages 1-11, June.

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