高速铁路高架桥接触网系统引雷特性研究

项目名称： 高速铁路高架桥接触网系统引雷特性研究

项目编号： No.51507145

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 李瑞芳

作者单位： 西南交通大学

项目金额： 21万元

中文摘要： 雷击是影响高速铁路安全运营的主要因素之一，高速铁路引雷特性的研究对铁路防雷措施的提出具有重要指导意义。高速铁路由于大面积采用高架桥结构，使得牵引网对地高度增加，引雷范围增大，比普速铁路遭受雷击概率大得多。高速铁路对安全性的要求又高于普速铁路，因此，专门针对高速铁路高架桥接触网系统进行引雷特性研究十分必要。. 本项目拟通过优化模拟电荷法研究雷电先导作用下的高架桥电荷分布；研究随着下行先导发展，高架桥及接触网周围感应电荷的动态变化，进而研究雷电通道任一点的场强动态变化。结合所计算的动态场强，计算该空间任一点处先导往临近点的发展概率，模拟先导通道的分形发展过程；研究雷电流幅值、雷电先导位置、高架桥参数等变化时雷击路径的变化，给出高架桥接触网系统引雷范围和落雷密度随相关因素的变化规律。

中文关键词： 高速铁路；高架桥；接触网；引雷特性；优化模拟电荷法

英文摘要： Lightning is one of the main factors that influence the safe operation of high-speed railway, the research on lightning-attracting characteristics of high-speed railway is significant to railway lightning protection measures. Due to the wide use of the elevated structure in high-speed railway, the height of traction network increases, the range of attracting lightning expands and lightning probability is much greater than that of the normal speed railway. And the requirement for safety of high-speed railway is much greater than that of the normal speed railway. Therefore, it is necessary to do research on lightning-attracting characteristics specifically for the elevated bridge and catenary system on high-speed railway.. In this project optimal charge simulation method is used to research the charge distribution of elevated bridge with the development of lightning leader; the dynamic changes of induced charge around the elevated bridge and catenary will be researched with the development of downward leader, and then the field strength dynamic change of each point in lightning channel will be studied. On the basis of dynamic field strength calculation, the probability of leader from one point to adjacent point will be calculated, and the leader channel fractal development process will be simulated; and the change of lightning path will be studied with variation of the amplitude of lightning current, the lightning leader position, elevated bridge parameter and so on, then with the changing of corresponding factors,the change rules of lightning-attracting range and lightning flash density of elevated bridge and catenary system will be obtained.

英文关键词： high-speed railway;elevated bridge;catenary;lightning-attracting characteristics;optimal charge simulation method