雷击高速铁路牵引网引发的跳闸率分析

Analysis of Trip-out Rate caused by Lightning Striking on Traction Network of High-speed Railway

近年来电气化铁路牵引网跳闸事故频发,由雷击引发的跳闸率日益增长,对电气化铁路的安全运行带来严峻挑战。目前高速铁路的桥占比较高,由于未设置专门的避雷线,牵引网直击雷跳闸率很高。本文首先基于经典击距理论分析牵引网的直击雷跳闸率,考虑雷击入射角度与风速两个相关因素以改进牵引网的电气几何模型,并采用蒙特卡罗法模拟计算雷击入射角与风速在一定范围内发生改变时牵引网的直击雷跳闸次数,得出结论:雷击入射角度变化会对电气线路的暴露距离产生影响,当雷电入射角度为0~45°时,会屏蔽牵引网的架空地线,因此绕击率为0,而风速增大2倍时,接触线、正馈线的绕击率至少增大1倍。该研究结论可为高速铁路牵引网的防雷研究提供参考。

In recent years,the accident of tripping of electrified railway traction network occurs frequently,and the trip-out rate caused by lightning is increasing day by day,and it brings severe challenges to the safe operation of electrified railway.At present,the proportion of bridges in high-speed railway is relatively high.Since there is no special lightning protection line,the direct lightning trip-out rate of traction network is very high.On the basis of the classical strike distance theory,the paper,with analyzing the direct lightning trip-out rate of the traction network,taking account of the two related factors of lightning incidence angle and wind speed to improve the electrical geometric model of the traction network,and with application of the Monte Carlo method to simulate and calculate the direct lightning trip times of the traction network when the lightning incidence angle and wind speed change within a certain range,obtains the conclusion:the change of lightning incidence angle will affect the exposure distance of electrical lines,when the lightning incidence angle is 0~45℃,the overhead ground wire of traction network will be shielded,so the shielding rate is 0.However,when the wind speed increases by 2 times,the shielding rate of contact wire and positive feeder will increase by at least 1 time.The research conclusion is able to provide reference for the lightning protection research of high-speed railway traction network.