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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。
The HRIGS is an important guarantee for the operation safety of high-speed railway. It is of great significance to study HRIGS grounding impedance and dispersion characteristics for accurate understanding of HRIGS mechanism and measurement methods. Therefore, by using CDEGS numerical simulation software, the calculation model of HRIGS through ground is established, and the relationship between HRIGS ground resistance and soil resistivity, ground penetrating radius, depth and width are obtained. The concept of effective measurement length of HRIGS range, flow length and ground impedance is proposed. The quantitative values of these three parameters under different soil resistivities are calculated. The results show that with the increase of soil resistivity, the effective measuring range of HRIGS ’action range, dispersion length and ground impedance also gradually increases. In the range of the integrated grounding system, the vertical distance farthest from the rail is a power function relationship with soil resistivity. When the soil resistivity is 100? M, the HRIGS divergence length is about 4 km and the effective impedance About 2 km. When the soil resistivity is 5000? M, the HRIGS divergence length is 30 km, the effective ground impedance measurement length is about 10 km, and the effective measurement length of HRIGS ground impedance is significantly less than the bulk flow length.