高铁综合接地系统特定信号响应特性研究  

Research on Response Characteristic of High-speed Railway Integrated Grounding System Subjected to Specific Signals

作　　者：程宏波[1] 张雪松[1] 黎医博 肖梓康 王勋[1] 

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《武汉理工大学学报（交通科学与工程版）》2017年第2期218-223,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：江西省自然科学基金资助项目(20143ACB21019);南昌市科技支撑资助项目(2014HZZC012)资助

摘　　要：准确分析不同信号电流激励时,综合接地系统(IGS)电压衰减及电流散流特性可为强弱电系统的耦合分析提供基础.针对高铁IGS中常见的几种的重要信号,考虑牵引回流、故障短路电流在贯通地线上的集肤效应,采用谐波含有率交流阻抗计算法建立接地系统的仿真模型;考虑雷电流在贯通地线上的火花放电效应,采用逐次逼近法建立综合接地系统仿真模型.定义IGS响应电压的有效衰减长度及信号电流的有效散流长度等概念,对不同土壤电阻率及不同信号作用下两个参数的变化趋势进行了分析比较.结果表明,土壤电阻率不变时,牵引回流产生的IGS响应电压有效衰减长度最长,牵引短路电流次之,雷电流的最短且远远小于前两者的系统响应电压有效衰减长度,信号电流的有效散流长度变化规律与之类似.土壤电阻率增大时,信号电流的有效散流长度及IGS响应电压的有效衰减长度均增大,但土壤电阻率与二者之间为非线性关系.另外,同一信号电流对应的IGS响应电压有效衰减长度均大于其电流有效散流长度.Integrated Grounding System？s characteristics of voltage attenuation and current dispersion to different signal currents can provide the basis for analyzing both strong and weak power system coupling. Concerning the important signals on Integrated Grounding System of high speed railway, the model of IGS is established by using the method of harmonic current impedance calculation, considering the skin effect of traction return current and fault short-circuit current, and using the method of successive approximation considering the spark discharge effect of lightning current. The effective attenuation length to voltage （LRV） and effective dispersion length to current （LSC） are defined to IGS, and their variation trends on different soil resistivity and different signal are analyzed. Results show that when soil resistivity remains constant, the LRV to traction return current is the longest, and the LRV to lightning current is the shortest, either the LSC. When soil resistivity increased, the LRV and LSC are increased both with nonlinear relationship. In addition, the LRV is always longer than the LSC for the same signal current.

关 键 词：综合接地系统 集肤效应 火花放电效应 有效衰减长度 有效散流长度 

分 类 号：U223.6[交通运输工程—道路与铁道工程]