高速铁路牵引网暴露弧面法直击雷跳闸率计算

Calculation of Direct Lightning Stroke Trip-out Rate With Exposure Globoid Method for High-speed Railway Traction Network

雷直击接触网导致线路跳闸或设备损坏是影响中国高速铁路安全运行的重要因素,必须针对高直击雷害风险区段采取相应措施,提高整体防雷运行水平。基于高速铁路结构特征,建立了牵引网三维雷击电气几何模型,推导了馈线及承力索三维直击雷暴露弧面的垂直投影面积,结合沿线雷电活动参数,得到了高速铁路牵引网直击雷跳闸率的算法,并通过沪宁城际高铁实际运行雷击故障数据验证了该模型及算法的准确性,并分析了沪宁城际高铁牵引网直击雷害的特点。结果表明:随着雷电流的增大,承力索及馈线三维暴露弧面垂直投影面积均增大,增大速率均递减,承力索与馈线三维暴露弧面垂直投影面积之比先增大后减小。

The direct lightning trip-out faults and equipment damage are important factors affecting safe running of China＇s high-speed railway. The pertinent measures for high-risk section of direct lightning must be taken to improve the overall lightning protection performance. This paper established a three-dimensional lightning electric geometry model of traction network based on structural characteristics of the high-speed railway and deduced three-dimensional lightning exposure globoids of feeder wire and messenger wire. Combined with lightning activity parameters along railway tracks, an algorithm on lightning strike trip-out rate of traction network was proposed. By comparing calculation results and actual lightning faults of the Shanghai-Nanjing intercity high-speed rail, the accuracy of algorithm and model was confirmed. The direct lightning features of the Shanghai- Nanjing intercity high-speed rail were analyzed and the result shows that, with lightning current increasing, the three-dimensional lightning exposure globoids of feeder wire and messenger wire both increase while their increasing velocities decrease especially when the lightning current is larger. The ratio of exposure globoids between feeder wire and messenger wire appears to be firstly increasing and then decreasing with the rising of lightning current.