中文摘要：

云广特高压直流输电线路将途经雷电活动强烈的区域，研究其反击耐雷性能对线路防雷设计有重要的意义，为此用ATP—EMTP软件建立了特高压直流输电线路反击耐雷性能数字仿真模型，它包括输电线路杆塔的多波阻抗模型、绝缘子的先导发展闪络模型和杆塔接地阻抗非线性模型。利用所建立的反击模型计算了云广特高压直流输电线路的反击耐雷性能。结果表明，特高压直流输电线路的反击耐雷水平较高，线路发生反击闪络的事故概率较低；随着杆塔高度的降低，接地阻抗的减小，线路绝缘水平的增强，云广±800kV特高压输电线路反击耐雷性能增强。

英文摘要：

Based on the ATP-EMTP software, this paper presents a mathematical simulation model on the lightning back-flashover performance of UHV DC transmission lines, which includes the multi-wave-impedance model of tower, the leader propagation flashover model of insulators and the non-linear model of surge footing resistance. By the model,the lightning back-flashover performance of Yun-Guang UHV DC transmission lines is calculated. The results indicate that the lightning back-flashover performance of UHV DC transmission lines is superior to that of EHV and HV transmission lines, and the probability of lightning back-flashover is very small. Moreover, the lightning back-flashover performance of UHV DC transmission lines increases with the increment of the insulation level and the decrease of the tower s height and the surge footing resistance.