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Ion Migration in the Process of Water Freezing under Alternating Electric Field and Its Impact on Insulator Flashover

Author

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  • Xingliang Jiang

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

  • Quanlin Wang

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

  • Zhijing Zhang

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

  • Jianlin Hu

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

  • Qin Hu

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

  • Chengzhi Zhu

    (State Grid Zhejiang Electric Power Company, Hangzhou 310000, China)

Abstract

Ice flashover threatens the security and reliability of power transmission. However, the ice flashover mechanism of insulators remains poorly understood. This study analyses water droplet freezing and ion distribution in ice layer under alternating electric field. It also investigates ion migration during icing process of insulator string under alternating electric field and its effects on insulator flashover. Results showed that the average freezing time of water droplets was related to electric field strength. The extent of ion migration during freezing decreased with increasing electric field strength. The maximal melting water conductivity of the ice layer and icicle of the insulator formed under energized condition was higher than the corresponding freezing water conductivity but lower than that under non-energized condition. Furthermore, the hanging location of each insulator significantly affected the melting water conductivity of the ice layer. The surface conductivity of the ice layer increased because of the conductive ion migration in freezing water during freezing, which was an important factor that decreased the flashover voltage of the ice-covered insulator. The existence of alternating electric field would impact the extent of ion migration. This study may serve as a reference for updating prediction flashover model of ice-covered insulators during the melting period.

Suggested Citation

  • Xingliang Jiang & Quanlin Wang & Zhijing Zhang & Jianlin Hu & Qin Hu & Chengzhi Zhu, 2017. "Ion Migration in the Process of Water Freezing under Alternating Electric Field and Its Impact on Insulator Flashover," Energies, MDPI, vol. 10(1), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:61-:d:87083
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    References listed on IDEAS

    as
    1. Jianlin Hu & Caixin Sun & Xingliang Jiang & Qing Yang & Zhijin Zhang & Lichun Shu, 2011. "Model for Predicting DC Flashover Voltage of Pre-Contaminated and Ice-Covered Long Insulator Strings under Low Air Pressure," Energies, MDPI, vol. 4(4), pages 1-16, April.
    2. Qing Yang & Rui Wang & Wenxia Sima & Chilong Jiang & Xing Lan & Markus Zahn, 2012. "Electrical Circuit Flashover Model of Polluted Insulators under AC Voltage Based on the Arc Root Voltage Gradient Criterion," Energies, MDPI, vol. 5(3), pages 1-18, March.
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    Cited by:

    1. Yuyao Hu & Sihua Guo & Richang Xian & Xingbo Han & Zhongyi Yang & Ying Wu, 2018. "Flashover Performance and Process of Suspension Insulator Strings Artificially Covered with Snow," Energies, MDPI, vol. 11(11), pages 1-14, October.
    2. Jiazheng Lu & Pengkang Xie & Jianping Hu & Zhenglong Jiang & Zhen Fang, 2018. "AC Flashover Performance of 10 kV Rod-Plane Air-Gapped Arresters under Rain Conditions," Energies, MDPI, vol. 11(6), pages 1-11, June.
    3. Xingbo Han & Xingliang Jiang & Zhongyi Yang & Conglai Bi, 2018. "A Predictive Model for Dry-Growth Icing on Composite Insulators under Natural Conditions," Energies, MDPI, vol. 11(6), pages 1-16, May.
    4. Shanpeng Zhao & Chenrui Zhang & Youpeng Zhang & Sihua Wang, 2019. "Influence of Partial Arc on Electric Field Distribution of Insulator Strings for Electrified Railway Catenary," Energies, MDPI, vol. 12(17), pages 1-16, August.
    5. Xiangxin Li & Ming Zhou & Yazhou Luo & Gang Wang & Lin Jia, 2018. "Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover," Energies, MDPI, vol. 11(9), pages 1-11, September.

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