高铁站台内部钢筋对相邻股道互阻抗的影响分析

Analysis of Influence of Steel Bar on Mutual Impedance of AdjacentRailway Tracks in High-speed Railway Platform

高铁车站内股道间电磁信号邻线干扰防护是列车安全运行控制的要求,两线间互阻抗是邻线干扰的重要参数。对高铁站内轨道电路邻线干扰较为严重的工程问题进行理论研究,定量分析站台基础设施结构钢筋差异带来的电磁环境影响;推导相邻轨道电路互阻抗表达式,并对影响互阻抗大小的因素进行仿真分析;在某高铁站对两轨道电路互阻抗进行现场测试。仿真分析结果和现场实测结果均表明:站台内钢筋的存在,使相邻股道间互阻抗增加,且互阻抗增加量随工作频率的提高而增大。

The protection against the electromagnetic signal interference in the track circuit of adjacent lines is required for safe train operation control in high-speed rail stations.The mutual impedance between lines is a significant parameter in the study of interference in the track circuit of adjacent lines.In this article,a theoretical study was conducted on the severe engineering problem of interference in the track circuit of adjacent lines in the high-speed rail stations.The electromagnetic environment impact caused by the difference in the steel bars of the platform infrastructure was quantitatively analyzed.The mathematical expression for mutual impedance of interference in the track circuit of adjacent lines was derived,while the factors affecting the magnitude of the mutual impedance were simulated and analyzed.The mutual impedance between two track circuits was tested on-site in a high-speed rail station.Both the simulation analysis results and the on-site measurement show that the presence of steel bars in the platform increases the mutual impedance between adjacent tracks,and the increase in mutual impedance increases with the increase of the working frequency.