AT供电方式综合接地系统的仿真研究

高速铁路列车运行速度高、行车密度大、牵引电流大,再加上采用整体道床,钢轨—大地泄露电阻大,导致钢轨电位急剧升高。过高的钢轨电位严重威胁人身和设备安全。为了解决钢轨电位升高问题,在设计牵引供电系统时提出了采用综合地线的措施。对高速铁路AT供电方式牵引回路进行建模,仿真分析了不同接地方案下,牵引网正常运行和短路故障时钢轨电位的分布规律与特征,以此分析综合地线系统对钢轨电位的钳制作用,并提出了适合我国高速铁路的综合接地系统。

Simulation and Study on Integrated Grounding System in AT Power Supply

High running speed, high driving densities, strong traction load current, together with the whole track bed, high leakage resistance lead to rail potential increased sharply. Rail potential threatens human and equipment safety seriously. In order to solve the problem of rail potential rise in the design of traction power supply system proposed integrated ground measures. The traction network model of AT power supply is established. Then distribution regularity and characteristics of rail potential are analyzed in different ground systems when traction network operates normally or has short-circuit fault, which is used for analyzing the role of stifle of comprehensive grounding system to rail potential. So a comprehensive grounding system is proposed which is fit for Chinese passenger dedicated line.