The increasing lightning-induced trip accidents of high-speed railway traction network in recent years-seriously threaten the normal operation of high-speed railway . Asmost of the high-speed railway was built on viaduct ,without special lightning conductor , the traction network is vulnerable to lightning strike . There-fore ,direct lightning trip-out rate is high .In this paper ,the lightning strike trip rate of traction network was analyzed based on the classical electrical geometric model . The electrical geometry model was improved consid-ering the influence of lightning incidence angle and wind speed .Combined with the Monte Carlo method ,the-lightning strike trip rate of thetraction network under different lightning incidence anglesand different wind speedswas calculated . When the wind speed increases twice , the shielding failure rate of contact lineand posi-tive feed-line will double . The change of lightning incidence angle will change the exposure distance of the line . When the lightning incidence angle is in the range of [0 , π4 ] , the overhead ground line is just shielded with the shielding failure rate being about zero . The calculation results will provide reference for the lightning pro-tection engineering for traction network .%近年来高速铁路牵引网的雷击跳闸事故不断增多,严重威胁高速铁路的正常运行.高速铁路建于高架桥的比例较高,而没有专设避雷线,容易遭受雷击,因此直击雷跳闸率较高.本文基于经典电气几何模型分析牵引网的直击雷跳闸率,考虑雷击入射角与风速的影响对电气几何模型加以改进,并结合蒙特卡罗法模拟计算不同雷击入射角与不同风速范围下牵引网的直击雷跳闸次数.当所处环境的风速升高两倍,计算所得接触线及正馈线的绕击率均升高至少一倍.雷击入射角的不同会影响线路的暴露距离,当雷电入射角较小,在[0,π4]范围内时,架空地线刚好被屏蔽,其绕击率为0.计算结果可为牵引网的防雷工程提供参考.
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