中文摘要：

着重介绍了输电线路防雷中绕击耐雷性能的5种计算方法：规程法、电气几何模型法、改进电气几何模型法、基于先导发展法的线路雷击模型法和基于分形理论的雷电通道模型法。分析了各种方法的基本原理、适用条件和优缺点，提出基于先导发展法的线路雷击模型中雷击随机性的分析．以及基于分形理论的雷电通道模型法中分形系数的确定是目前研究的两大难点．也是今后研究和发展的重要方向。

英文摘要：

This article highlights five calculation method of shielding failure lightning withstand performance in transmission line lightning protection, including standard method, EGM, improved EGM method, lightning strike model law based on pilot development law and lightning channel model law based on fractal theory, the basic principles, applicable conditions, as well as the strengths and weaknesses of various methods are analyzed, and it is proposed that the analysis on the lightning randomness in lightning strike model based on pilot development law, and the determination of fractal coefficient in lightning channel model based on fractal theory, are not only the difficulty in the present research, but also an important direction for the future research and development.