中文摘要：

根据接触网的特点建立雷击悬挂系统的等值电路,提出悬挂系统波阻抗的计算方法。建立雷击回流线时的物理模型和等值电路,得出雷击回流线任意部位时接触网的耐雷水平计算公式。基于等值引雷宽度法和雷击距理论建立接触网的引雷范围模型,提出直接雷击条件下承力索和回流线分别遭受雷击几率的计算方法。对于典型接触网进行计算的结果为：悬挂系统波阻抗为233.8Ω;集中接地方式下的接触网耐雷水平有很大差异（1.25~26.37 kA）,如采用分散接地方式,其耐雷水平将达到26.75~43.69 kA;雷击典型接触网悬挂系统的几率为14%。

英文摘要：

Based on the characteristics of catenary,the equivalent circuit of lightning strike on the suspension system was established and the calculation method for the surge impedance of the suspension system was proposed.Combined with the lightning mechanism on the overhead return wire（OHRW）,the physical model of lightning strike on OHRW and its equivalent circuit then was established.The formula was obtained for calculating the Lightning Withstand Level（LWL） of the catenary as lightning struck on any position of OHRW.Based on equivalent triggered lightning width method and striking distance theory,a model of triggered lightning range for catenary was proposed.The method was put forward to calculate the lightning strike probability of the catenary and the return wire respectively under the direct lightning strike condition.Taking typical catenary for calculation,the results show that the surge impedance of the suspension system is 233.8 Ω.The LWL of catenary at different lightning position ranges from 1.25 to 26.37 kA under centralized grounding.If the catenary takes dispersive grounding, its LWL can reach 26.75 to 43.69 kA.The probability of lightning on the suspension system of typical catenary is 14%.