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The interconnection project from Xinjiang to the main grid of Northwest China is crucial for linking the power grids of Xinjiang, Gansu, and Qinghai. The 750 kV double-circuit transmission line plays a key role in this initiative, but its extensive, flat trajectory and lack of adequate shielding render it vulnerable to lightning strikes, particularly during thunderstorms. Additionally, the region’s complex terrain and frequent windy and dusty conditions further complicate the performance of transmission line insulation. To improve lightning protection, this paper explores the formulas for lightning shielding and counterattack rates and develops a model to calculate the lightning trip rate for the transmission lines. The analysis includes recommendations for effective insulation configurations, providing a theoretical foundation for enhancing lightning withstand capabilities in demanding environments.

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Lightning Withstand Level Analysis of 750kV Transmission Lines in Northwest China Interconnection Project Under Harsh Environment

  • 会议论文

  • 发表日期：

    2026年

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  • Ying Wang,
  • Penghan Li,
  • Keqiang Tai,
  • Wei Cui,
  • Meng Wang,
  • Shuanbao Niu,
  • Ruiyong Zhang

摘要

The interconnection project from Xinjiang to the main grid of Northwest China is crucial for linking the power grids of Xinjiang, Gansu, and Qinghai. The 750 kV double-circuit transmission line plays a key role in this initiative, but its extensive, flat trajectory and lack of adequate shielding render it vulnerable to lightning strikes, particularly during thunderstorms. Additionally, the region’s complex terrain and frequent windy and dusty conditions further complicate the performance of transmission line insulation. To improve lightning protection, this paper explores the formulas for lightning shielding and counterattack rates and develops a model to calculate the lightning trip rate for the transmission lines. The analysis includes recommendations for effective insulation configurations, providing a theoretical foundation for enhancing lightning withstand capabilities in demanding environments.