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The operational reliability of overhead transmission lines depends critically on suspension insulator strings. Contamination and subsequent moisturizing of insulator surfaces drastically reduce discharge voltage, leading to flashover. This is exacerbated by non-uniform voltage distribution inherent to string design, which elevates leakage currents under contamination. This study investigates a mitigation strategy: applying protective coatings to high-electric-field zones to homogenize voltage distribution. Insulating silicon sealant and enamel were evaluated on contaminated strings under varying moisture. The voltage distribution non-uniformity factor was analyzed across strings of 9 to 13 insulators with test voltages from 80% to 120% of the nominal 115 kV. The study quantifies the improvement in voltage uniformity, identifying effective solutions for suppressing leakage current. The findings offer practical guidance for enhancing contamination withstand capability, providing a cost-effective alternative to complete insulator replacement.

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A Novel Quasi-monitoring and Development Method of Glass Suspension Insulator String Under Operation

  • 会议论文

  • 发表日期：

    2026年

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  • Vladislav Popovtsev,
  • Yurii Patrakov,
  • Vladislav Egorov,
  • Zhanqing Chen,
  • Zhipeng Lei

摘要

The operational reliability of overhead transmission lines depends critically on suspension insulator strings. Contamination and subsequent moisturizing of insulator surfaces drastically reduce discharge voltage, leading to flashover. This is exacerbated by non-uniform voltage distribution inherent to string design, which elevates leakage currents under contamination. This study investigates a mitigation strategy: applying protective coatings to high-electric-field zones to homogenize voltage distribution. Insulating silicon sealant and enamel were evaluated on contaminated strings under varying moisture. The voltage distribution non-uniformity factor was analyzed across strings of 9 to 13 insulators with test voltages from 80% to 120% of the nominal 115 kV. The study quantifies the improvement in voltage uniformity, identifying effective solutions for suppressing leakage current. The findings offer practical guidance for enhancing contamination withstand capability, providing a cost-effective alternative to complete insulator replacement.