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高速铁路牵引网暴露弧面法直击雷跳闸率计算

DOI: 10.13334/j.0258-8013.pcsee.2015.19.030, PP. 5103-5113

Keywords: 高速铁路,牵引网,三维暴露弧面,直击雷综合概率,直击雷跳闸率

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Abstract:

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。

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