This article investigated the indirect lightning performance of an overhead line versus critical flashover voltage in the ground with two vertical layers, ocean and land. A novel method based on Monte Carlo and 3-D finite element method is provided to evaluate the annual number of line insulator flashovers. The proposed procedure reduced the computational efforts of the accurate induced voltage calculation and then the estimation of the line lightning performance. Using the proposed Monte Carlo method, the effect of the line distance from the ocean–land line interface, overhead line poles distance, land conductivity, and different ways for calculating the striking distance on the prediction of the yearly lightning flashover was analyzed. The obtained statistical results show that considering the mixed ocean–land propagation path ground strongly impacted the predicted number of the line flashovers caused by indirect lightning.

中文翻译：

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考虑海陆混合传播路径的架空配电线路间接雷性能

本文研究了架空线路的间接雷击性能与海洋和陆地两个垂直层地面临界闪络电压的关系。提出了一种基于蒙特卡罗和三维有限元方法的新方法来评估线路绝缘子每年的闪络次数。所提出的程序减少了精确感应电压计算以及线路雷电性能估计的计算量。利用所提出的蒙特卡罗方法，分析了距海陆线界面的线路距离、架空线杆距、陆地电导率以及不同雷击距离计算方法对年雷闪络预测的影响。统计结果表明，考虑到海陆混合传播路径，地面对间接雷引起的线路闪络次数的预测有很大影响。