Technical Analysis of Lightning Protection System in Urban Railway Transit

The subways are engineering construction projects with highly centralized mechatronic, electrical and electronic systems, which are vulnerable to be attacked by lightning, and causing personal injuries and economic losses. Through calculating of the number of the predicted lightning strikes in Jinan, the significance of the railway transit in city is analyzed, the results indicate that the railway stations are determined as the second type of buildings for lightning protection. According to the classification of the traction power supply, the protection method of direct lightning of the overhead contact line equipment and the contact rail are discussed respectively. The reasons of both grounding and insulation installation are analyzed about platform screen door system, and the measures for insulation installation of platform screen door system are given, that provide a basis for the detection of railway transit lightning protection devices.