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Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover

Author

Listed:
  • Xiangxin Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing 102206, China
    National Power Grid Corp North China Branch, Xicheng District, Beijing 100053, China)

  • Ming Zhou

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing 102206, China)

  • Yazhou Luo

    (National Power Grid Corp North China Branch, Xicheng District, Beijing 100053, China)

  • Gang Wang

    (Tianjin Electric Power Dispatching and Communication Center, Hebei District, Tianjin 300010, China)

  • Lin Jia

    (National Power Grid Corp North China Branch, Xicheng District, Beijing 100053, China)

Abstract

Considering the ice shedding phenomena on ice-covered outdoor insulators, this paper conducted the artificial experiments by using a five-unit suspension ceramic insulator string covered with wet-grown ice to investigate the effects of ice shedding on the icing discharge characteristics. According to IEEE Standard 1783/2009, the minimum flashover voltage (VMF), propagation of discharges to flashover and related leakage current (LC) were measured. It was found that VMF after ice shedding can be increased by about 17% as compared with that before ice shedding. The initiation and formation of discharge arcs across ice-free regions caused by ice shedding become difficult, showing an unstable propagating path, indeterminate arc shape and longer arc column. Although VMF under ice shedding conditions is higher than that without ice shedding, the fundamental component, and harmonics show lower amplitudes for the latter case. The ratios of harmonics to the fundamental are well in accordance with discharge characteristics during the flashover for which the ratios show a relatively stable varying tendency in the absence of ice shedding, but show changeable and indeterminate variation under ice shedding conditions. The obtained results are helpful to understand the icing state and its influence on surface discharges for preventing the icing flashovers.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2440-:d:169795
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    References listed on IDEAS

    as
    1. Yanpeng Hao & Jie Wei & Xiaolan Jiang & Lin Yang & Licheng Li & Junke Wang & Hao Li & Ruihai Li, 2018. "Icing Condition Assessment of In-Service Glass Insulators Based on Graphical Shed Spacing and Graphical Shed Overhang," Energies, MDPI, vol. 11(2), pages 1-12, February.
    2. Arshad & Azam Nekahi & Scott G. McMeekin & Masoud Farzaneh, 2016. "Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions," Energies, MDPI, vol. 9(9), pages 1-19, August.
    3. Jiazheng Lu & Pengkang Xie & Zhenglong Jiang & Zhen Fang & Wei Wu, 2018. "Voltage Distribution and Flashover Performance of 220 kV Composite Insulators under Different Icing Conditions," Energies, MDPI, vol. 11(3), pages 1-13, March.
    4. 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.
    5. Weigen Chen & Wanping Wang & Qing Xia & Bing Luo & Licheng Li, 2012. "Insulator Contamination Forecasting Based on Fractal Analysis of Leakage Current," Energies, MDPI, vol. 5(7), pages 1-14, July.
    6. Jianlin Hu & Xingliang Jiang & Fanghui Yin & Zhijin Zhang, 2015. "DC Flashover Performance of Ice-Covered Composite Insulators with Parallel Air Gaps," Energies, MDPI, vol. 8(6), pages 1-17, May.
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    Cited by:

    1. Jiazheng Lu & Jianping Hu & Zhen Fang & Xinhan Qiao & Zhijin Zhang, 2021. "Electric Field Distribution and AC Breakdown Characteristics of Polluted Novel Lightning Protection Insulator under Icing Conditions," Energies, MDPI, vol. 14(22), pages 1-11, November.

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