高速铁路综合接地系统的接地阻抗与散流特性  

Grounding Impedance and Current Dispersed Characteristics of High-speed Railway Integrated Grounding System

作　　者：王建国[1] 樊亚东[1] 张义[1] 周蜜[1] 孙建明[2] 戚广枫[2] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中铁第四勘察设计院集团公司,武汉430063

出　　处：《高电压技术》2015年第11期3576-3582,共7页High Voltage Engineering

基　　金：中铁第四勘察设计院集团有限公司科技项目(2011K88-1)~~

摘　　要：高速铁路综合接地系统(HRIGS)是高速铁路运行安全的重要保证,研究HRIGS接地阻抗和散流特性对于准确理解HRIGS作用机制及测量方法具有重要意义。为此,采用CDEGS数值仿真软件,建立了HRIGS贯通地线计算模型,得到了HRIGS接地阻抗与土壤电阻率、贯通地线的半径、埋深、宽度等的关系。提出了HRIGS作用范围、散流长度和接地阻抗有效测量长度的概念,并计算得到了不同土壤电阻率下这3个参数的定量数值。结果表明,随着土壤电阻率的增大,HRIGS的作用范围、散流长度和接地阻抗有效测量长度也逐渐增大。在综合接地系统作用范围内,离钢轨最远的垂直距离与土壤电阻率近似呈幂函数关系,当土壤电阻率为100?·m时,HRIGS散流长度约为4 km,接地阻抗测量有效长度约为2 km;而土壤电阻率为5 000?·m时,HRIGS散流长度达30 km,接地阻抗有效测量长度约为10 km,HRIGS接地阻抗有效测量长度明显小于散流长度。High-speed railway integrated grounding system（HRIGS） is an important safety guarantee to the operation of high-speed railway. Research on the grounding impedance and current distribution is of great significance to accurately understanding the characteristics and mechanism of the HRIGS and measurement method. Hence, by using CDEGS soft- ware, we established a calculation model for linking up grounding wire of HRIGS, and obtained the relationship among the grounding impedance of HRIGS, soil resistivity, radius and depth of run-through ground wire, and spacing of run-through ground wires, etc. The concept of influence scope, current diffuser length and effective measurement length of grounding impedance of HRIGS was proposed, and the corresponding quantitative values under different soil resistivi- ty were calculated. The results show that, with the increase of soil resistivity, the influence scope, current diffuser length as well as the effective measurement length of grounding impedance increase gradually. Moreover, within the influence scope of HRIGS, the maximum vertical distance from rail has an approximate power function with the soil resistivi- ty;when the soil resistivity is 100 Ω.m, The diffuser length is about 4 km, the effective measurement length of grounding impedance is about 2 kin, and the diffuser length is about 30 kin, the effective measurement spacing is about 10 km when the soil resistivity is 5 000 Ω.m, therefore the effective measurement length is less than the diffuser length obviously.

关 键 词：高速铁路 综合接地系统 接地阻抗 作用范围 散流长度 有效测量长度 

分 类 号：U223.8[交通运输工程—道路与铁道工程] TM862[电气工程—高电压与绝缘技术]