The planned 400 km/h high-speed train capable of cross-border intermodal transportation will inevitably cause a greater return-current and bring more challenges to signaling infrastructure and integrated grounding while achieving stronger traction. Based on the existing AC autotransformer power supply mode, this paper proposes a discrete modeling and calculation method of the traction return-current network concerning impedance equivalent, realizing the simulation and quantitative analysis of the return-current distribution of multiple current-carrying conductors in the block section and station yard under the double-track condition. Then, the dynamic distribution is analyzed comprehensively considering traction power supply, signaling, and integrated grounding systems. Also, the method is verified with field test data. Finally, the simulation of the return-current proportion of multiple conductors is carried out under the dynamic operating conditions of high speed, and the distribution characteristics are compared and analyzed under different ballast resistances. In the most unfavorable case, the maximum return-current in the rails, grounding wire, and protective wire can reach 1046 A, 180 A, and 126 A, respectively. This work helps evaluate the electromagnetic compatibility between signaling and strong currents in engineering practice, further optimize the capacity configuration of equipment along the railway lines, and improve the signaling immunity design.

规划中的时速400公里的跨境多式联运高铁，在牵引力更强的同时，必然会带来更大的回流，给信号基础设施和综合接地带来更多挑战。本文在现有交流自耦变压器供电方式的基础上，提出了一种涉及阻抗等效的牵引回流网络离散建模与计算方法，实现了对多条载流导体回流电流分布的仿真和定量分析。双线条件下的街区段和站场。然后，综合考虑牵引供电、信号和综合接地系统的动态分布进行分析。此外，该方法通过现场测试数据进行了验证。最后，在高速动态工况下进行多导体回流比例的仿真，对比分析不同镇流电阻下的分布特性。在最不利的情况下，轨道、接地线和保护线的最大返回电流分别可以达到 1046 A、180 A 和 126 A。该工作有助于在工程实践中评估信号与强电流之间的电磁兼容性，进一步优化沿线设备的容量配置，改进信号抗扰度设计。并比较分析了不同镇流电阻下的分布特性。在最不利的情况下，轨道、接地线和保护线的最大返回电流分别可以达到 1046 A、180 A 和 126 A。该工作有助于在工程实践中评估信号与强电流之间的电磁兼容性，进一步优化沿线设备的容量配置，改进信号抗扰度设计。并比较分析了不同镇流电阻下的分布特性。在最不利的情况下，轨道、接地线和保护线的最大返回电流分别可以达到 1046 A、180 A 和 126 A。该工作有助于在工程实践中评估信号与强电流之间的电磁兼容性，进一步优化沿线设备的容量配置，改进信号抗扰度设计。