Lightning impulse characteristic of weak curren grounding system of the high-speed railway roadbed section

The lightning safety problem of the high speed railway has always been closely watched, for improving the ability of high speed railway lightning protection, the research on lightning impulse characteristics of weak current equipment grounding of the high speed railway roadbed section is of great significance. This paper is based on CDEGS software to establish the coupling model of integrated grounding system and weak current grounding system of the high-speed railway, to simulate and calculate the impulse response under the action of lightning current. When the pillar is stroke by lightning, the lightning characteristics and the influencing rules of the weak current system are analyzed under different distances between the weak current system and integrated grounding system, different soil resistivity and different connection condition of the weak current system and integrated grounding system. The results show that the voltage of weak current system is decreasing with the increase of the horizontal distance and vertical distance between the weak current system and integrated grounding system; the voltage of weak current system is increasing with the increase of soil resistivity, and the voltage amplitude when the weak current system and integrated grounding system are connected is higher than when not connected.