We have surveyed a signaling equipment failure caused by the spread of ground potential rise (GPR) between the overhead catenary system (OCS) pillar with two anchor cables and the trackside equipment due to lightning strikes to the pillar in a high-speed railway depot. Also, we evaluate the lightning currents on these conductors and their GPR considering the effect of soil conductivity σ and distance d between the trackside equipment grounding rod and the anchor cable grounding system by using the 3-D finite-difference time-domain method. The simulation results show that the lightning current on the OCS pillar is shunted by anchor cables, and the distribution of currents on these conductors is influenced by soil conductivity. With the increase of soil conductivity, the current on the pillar increases, and the current on the anchor cable decreases. The GPR of the grounding systems is affected by the soil conductivity, and the GPR increases with the decrease of soil conductivity. Moreover, the GPR of trackside equipment grounding rod decreases with the increase of distance d.

中文翻译：

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高速铁路车辆段架空接触网支柱及其邻近接地系统的雷击瞬变


我们调查了一起高铁车辆段雷击支柱，导致带有两根锚索的架空接触网系统（OCS）支柱与轨旁设备之间的地电位升高（GPR）扩散而导致信号设备故障。此外，我们还考虑了土壤电导率 σ 以及轨旁设备接地棒与锚索接地系统之间的距离 d 的影响，采用 3-D 时域有限差分法评估了这些导体及其 GPR 上的雷电流。仿真结果表明，OCS支柱上的雷电流通过锚索分流，这些导体上的电流分布受到土壤电导率的影响。随着土壤电导率的增大，支柱上的电流增大，锚索上的电流减小。接地系统的GPR受土壤电导率的影响，GPR随着土壤电导率的减小而增大。而且，轨旁设备接地棒的GPR随着距离d的增加而减小。