Calculation and Simulation of High-Speed Rail Connecting Ground Wire Coupled Response in Lightning Transient

Abstract

With the rapid development of China's high-speed rail construction, accidents caused by lightning are more frequent. How to achieve a more effective lightning protection and grounding is the urgent problem to be solved currently. A two-parallel-connecting-ground-wire transmission line model with the distributed parameter of electromagnetic coupling would be built in this paper. In this model, the connecting ground wire would be defined as horizontal infinite length grounding body. The own distribution parameters of segmented conductor and the parameters of the electromagnetic coupling between the parallel segmented conductors are calculated, based on the theory of electromagnetic field to select the appropriate segment size. Based on this transmission line model, the electric potential distribution of the different positions on the two parallel connecting ground wires is calculated by using the electromagnetic transient calculation software ATP-EMTP. Comparing the calculation results in this paper and the simulation results in the simulation software CDGES, it would demonstrate that the electromagnetic coupling distributed parameter transmission line model in this paper is consistent with the actual situation and it could be used to analyze the electromagnetic coupling effect between the two buried parallel connecting ground wires.