接触网引雷范围划分及跳闸率的计算方法  

Lightning Scope Division and Lightning Trip-out Rate Calculation Method for Overhead Catenary System

作　　者：曹晓斌[1] 熊万亮[1] 吴广宁[1] 李瑞芳[1] 周利军[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《高电压技术》2013年第6期1515-1521,共7页High Voltage Engineering

基　　金：铁道部重大专项课题(2011T008);教育部中央高校基本科研业务费专项资金(SWJTU11CX035)~~

摘　　要：为了对接触网的雷击可靠性进行评估,根据接触网雷击过电压的产生途径,将其分为3种主要的雷击类型,提出了接触网雷击类型与雷电先导的位置有关。结合电气几何模型的基本原理,建立了单线区段和复线区段接触网的电气几何模型,给出了回流线、承力索的暴露弧范围,并推导了各暴露弧的交点坐标方程组,利用该方程组可以求得不同雷击类型的引雷范围。结合电力行业标准DL/T 620—1997中推荐的雷电流幅值分布概率与建弧率公式,分别给出了3种不同雷击类型的跳闸率计算公式以及总跳闸率的评估方法;并利用该方法计算了电气化铁路的雷击跳闸率,发现直供方式下复线区段的雷击跳闸率低于单线区段,提出了回流线对承力索的屏蔽作用是造成该现象的主要原因。In order to evaluate the reliability of traction power supply system struck by lightning, we divided lightning strokes into three types according to the way of lightning over-voltage production, and proposed that the lightning stroke type was decided by the position of lightning leader. Combined with the basic principle of the electrical geometry model（EGM）, EGMs of single-line section and doubleqine section of railway were established. Then the exposure arc range of return line and catenary wire were given, and coordinates equations of each exposure arc＇s intersection were derived. By using these equations, work ranges of different lightning types were obtained. Furthermore, taking the recommended calculation formula of lightning current amplitude distribution and construction of arc rate in DL/T 620--1997 into consideration, we proposed formulas of trip rate for the three lightning stroke types and an assessment method of total trip rate. After calculating the trip out rate of an electrified railway by the method, we found a phenomenon that the lightning trip rate of double-line section was lower than that of single-line section in a direct power supply system. Further analysis indicated that the shielding effect of return line on catenary was the main reason for this phenomenon.

关 键 词：高速铁路 电气几何模型 雷击跳闸率 接触网 感应雷 直击 反击 绕击 

分 类 号：TM922.5[电气工程—电力电子与电力传动]