Research On Coupling Effects Of Electromagnetic Pulse On Cables In High-speed Rail System

In this paper,under the background of actual scientific research projects,taking the typical cable scenarios of high-speed rail system as the research object,the magnitude and coupling law of the induced current of overhead cable,train cables and buried cables under the action of electromagnetic pulse are simulated,analyzed and demonstrated.Real-time simulation results provide more intuitive and experiments have been done for the development of simulation teaching.The research results and simulation cases have certain impetus to the electromagnetic simulation course of colleges and railway practitioners.The main work is as follows:(1)Research on coupling effect of electromagnetic pulse in overhead cables.The classical transmission line model is analyzed.The Agrawal model is used to analytically calculate the electromagnetic coupling problem of the cable,and the program is implemented.By comparing the results of cable electromagnetic coupling simulation with those of commercial software,it is found that the results are basically consistent,and then the influence of the incident angle,polarization angle,height,length and radius of the cable on the cable electromagnetic coupling is analyzed.On this basis,the electromagnetic coupling effect of railway catenary system under electromagnetic pulse is analyzed,which lays a foundation for further research on electromagnetic protection of catenary-related electronic systems.(2)Research on electromagnetic coupling effect of cables in trains.Based on the known law of coupling electromagnetic pulse of overhead cables.The radiation of cables,the crosstalk between cables and the coupling of cables in trains under the external excitation are studied in detail,and the electromagnetic effect of the network node of the train cables is simulated and analyzed.The results show that a certain distance should be maintained between the cables to reduce the impact of crosstalk.The peak value of the coupling current of the cables at the bottom of the train is smaller than that at the top of the train.The results provide a reference for the cable connection mode of each port and the reasonable planning of the cable in the train.(3)Research on electromagnetic pulse coupling effect of buried cables.In the actual project,a large number of cables are laid beside the rails of the high-speed railway system,and eventually connected to the train control system of the railway.According to the railway design rule,the paper establishes the model of buried cables and buried cables beside rails,and analyses the influence of buried depth,length of cables,pulse rising times,earth conductivity on the electromagnetic pulse coupling of buried cables,which provides theoretical reference for engineering practice.