Analysis of Lightning Shielding Effect by Overhead Ground Wire of Catenary System on the High-Speed Railway

This paper is verified the lightning shielding effect of overhead ground wire(OHGW) on high-speed railway catenary systems. The simulation results show that OHGW can effectively shield lightning current, resulting in a significant reduction in leakage current and improved lightning protection performance. The simulation was conducted using EMTP-ATP, which are widely used to analyze transient phenomena in power systems. The ground resistivity was assumed to be 1,000 [Ω·m]. The lightning shock withstand voltage of the catenary insulator was set to 250 [kV] and 380 [kV]. The lightning current was varied from 1 to 30 [kA]. As a result, when OHGW is installed in a bridge section where there is a risk of lightning, the minimum flashover current increases from 8 [kV] to 10 [kV] when the catenary insulator is 250 [kV]. At 380 [kV], the minimum flashover current increases from 14 [kV] to 17 [kV]. The results of this study suggest that OHGW is an effective way to improve the lightning protection performance of high-speed railway catenary systems. Copyright © The Korean Institute of Electrical Engineers.