Lightning is the main reason that endangers the safety and reliability of transmission line. The basis for differentiated lightning protection of transmission lines is to evaluate the lightning withstanding current of the entire transmission line. This article conducted a comprehensive analysis of the factors affecting the lightning withstanding current of transmission lines. Orthogonal experiments were conducted to compare the influence of different factors. It was found that the wave front time of lightning current has the greatest impact on the lightning withstanding current of back flashover, and the highest influential factor on the calculation results of the maximum shielding failure current is the tower nominal height. Taking the above results and analysis into consideration, suggestions are provided for lightning protection in engineering.Lightning is the main reason that endangers the safety and reliability of transmission line. The basis for differentiated lightning protection of transmission lines is to evaluate the lightning withstanding current of the entire transmission line. This article conducted a comprehensive analysis of the factors affecting the lightning withstanding current of transmission lines. Orthogonal experiments were conducted to compare the influence of different factors. It was found that the wave front time of lightning current has the greatest impact on the lightning withstanding current of back flashover, and the highest influential factor on the calculation results of the maximum shielding failure current is the tower nominal height. Taking the above results and analysis into consideration, suggestions are provided for lightning protection in engineering.

Lightning withstanding current,back flashover,shielding failure,lightning protection