高速铁路接触网与架空输电线路防雷规范差异对比分析  

Comparison and Analysis Code for Design Protection against Lightning between Overhead Contact Line System of High Speed Railway and Overhead Electrical Power Transmission Line

作　　者：王林[1] WANG Lin(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道标准设计》2022年第5期159-164,182,共7页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科研课题(2019K52)。

摘　　要：通过对比分析高速铁路接触网与架空输电线路防雷规范差异条款,并利用“经验法”计算高速铁路接触网地线和附加导线弛度、落雷次数、耦合系数、建弧率、绕击率、分流系数、耐雷水平、跳闸率等关键技术参数和指标,评估降低高速铁路雷击跳闸率相关措施的有效性。研究发现,全线架设架空地线的接触网绝缘水平及耐雷水平与66 kV架空输电线路相当,参考66 kV架空输电线路保护角的控制指标,可显著降低接触网的雷击跳闸率;在高土壤电阻率的山区通过采取局部提高线路绝缘水平和设置线路避雷器措施提高线路的耐雷水平,较盲目降低接地电阻更为经济合理;建议复线架空地线架设高度应满足两根地线间的距离不应超过地线与AF线间垂直距离的5倍,以确保架空地线对上下行正线接触网T线的防护效果。Through comparison and analysis of the terms of code for design protection against lightning between overhead contact line system of high speed railway and overhead electrical power transmission line,the“empirical method”is used to calculate key technical parameters and indexes of the high-speed railway such as earth wire and the additive conductor sag,ground lightning frequency,coupling coefficient,arc establishing rate,shielding failure rate,shunt coefficient,lightning withstand level and lightning trip-out rate,and to evaluate the efficiency of relevant measures to reduce lightning trip-out rate of high speed railway.It is found that the insulation level and lightning withstand level of overhead contact line system with ground wire are similar to 66 kV overhead electrical power transmission line,and the lightning trip-out rate of overhead contact line system can be significantly reduced by referring to the shielding angle of 66 kV overhead electrical power transmission line.In the mountainous area with high earth resistivity,it is more economical and reasonable to improve lightning withstand level by improving local insulation level and setting up line lighting arrester,rather than reducing randomly the ground resistance.At the same time,it is suggested that the erection height of overhead ground wires should meet the requirement that the distance between two ground wires should not exceed 5 times of the vertical distance between the ground wires and negative feeder so as to ensure effective protection of contact line by overhead ground wires.

关 键 词：高速铁路 接触网 防雷 保护角 耐雷水平 雷击跳闸率 

分 类 号：U226.83[交通运输工程—道路与铁道工程] TM863[电气工程—高电压与绝缘技术]