Lightning flashover characteristics of metro viaduct section with contact rail power supply system
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ORIGINAL PAPER
Lightning flashover characteristics of metro viaduct section with contact rail power supply system Xiaobin Cao1 · Ruifang Li1 · Xin Tao2 · Xue Yang2 · Xiaodong Sun3 · Hu Han4 Received: 18 September 2018 / Accepted: 23 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A flashover of the insulation guardrail will lead to a ground fault of the contact rail, which will cause metro traffic interruption. In this paper, we study the lightning flashover characteristics of a metro viaduct section with a contact rail power supply system. The lightning protection zones of different lightning overvoltage types on metro viaducts are divided according to the rolling ball method, and it is found that it is very unlikely that lightning will strike the contact rails directly. The damage caused by lightning to the contact rail is induced overvoltage and back flashover. A simulation model of a metro viaduct was formulated using electromagnetic transient simulation software. Based on those models, a series of simulations are performed to study the lightning flashover characteristics of the contact rail power supply system. The study found that the lightning protection belt and trains are vulnerable lightning strikes. When lightning strikes a train, the lightning current required to cause the insulation guardrail to flashover is 118 kA. When lightning strikes the lightning protection belt, only 53 kA is sufficient to cause an insulation fence flashover. In addition, the influence of the pier grounding resistance is also analyzed. The result indicates that reducing the pier grounding resistance could improve the lightning withstand level of the contact rail power supply system. Keywords Contact rail · Viaduct · Flashover characteristics · Insulated guardrail · Train · Lightning protection belt
1 Introduction The contact rail power supply technology is widely used in China’s metro system. Compared with the underground section of the system, viaducts draw increased amounts of lightning. The metro power supply system has no backup, so when it is damaged by lightning, the whole line will be shut * Ruifang Li [email protected] Xiaobin Cao [email protected] Xin Tao [email protected] 1
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan Province, China
2
Maintenance Company of Sichuan Electric Power Co., Chengdu, China
3
Xuchang Power Supply Company of State Grid Henan Electric Power Company, Zhengzhou, China
4
POWERCHINA Sichuan Electric Power Engineering Co., LTD, Chengdu, China
down. In recent years, many accidents caused by lightning strikes have occurred. For example, the Nanjing metro line 1 is powered by contact rail, and in 2010, its viaduct was struck by lightning. Four trains lost power and the entire line was shut down for 3 h [1]. At present, there are some studies on lightning protection for urban rail transit by some scholars and institutions in China. In [2], the feasibility of using a lightning conductor to protect subway l
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