One of the phenomena affecting the insulation coordination of power distribution systems is indirect lightning. This article aims to investigate the impacts of stratification of the soil along with the characteristics of the lightning current, i.e., peak, current time-derivative, striking distance to overhead lines on quantification of the lightning indirect overvoltage (LIOV). Accordingly, comprehensive analyses have been established based on the finite integration technique. The flexibility of the method and the simulation results have been compared with the other finite element method and well-known formula, i.e., Rusck and Darveniza. It is also demonstrated that the Darveniza's formula cannot be relied upon as a precise approach in nonuniform grounds. It is revealed that more resistivity of the lower layer results in the increase of LIOV peak in a two-layer soil. It is comprehended that the increase in the number of layers could highly affect LIOVs. Furthermore, the results indicate that the nonuniformity of the ground increases the sensitivity of LIOV to the characteristics of lightning strokes. Finally, an intelligent package is introduced to assess the characteristics of the indirect lightning-induced overvoltage in the complex situation within acceptable accuracy and computation time based on an equivalent resistivity of the soil.

中文翻译：

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在土壤非均匀性下使用 FIT 分析量化间接闪电

影响配电系统绝缘配合的现象之一是间接雷击。本文旨在研究土壤分层以及雷电流的特性，即峰值、电流时间导数、到架空线的击穿距离对闪电间接过电压（LIOV）量化的影响。因此，基于有限积分技术建立了综合分析。该方法的灵活性和模拟结果已经与其他有限元方法和众所周知的公式，即Rusck和Darveniza进行了比较。还证明了 Darveniza 的公式不能作为非均匀地面的精确方法依赖。结果表明，下层电阻率越大，两层土壤中的 LIOV 峰值越大。据了解，层数的增加可能会对 LIOV 产生很大影响。此外，结果表明，地面的不均匀性增加了 LIOV 对雷击特性的敏感性。最后，基于土壤等效电阻率，引入智能包，在可接受的精度和计算时间内评估复杂情况下间接雷电感应过电压的特性。