虞锦孙

摘 要：铁路电力系统的供电安全在整个铁路系统中占有重要地位，其直接影响铁路系统的运行。特别是近年来随着铁路电气化高速发展，大批新设备在铁路沿线得到广泛使用，对接地网的要求越来越高，在常规电力系统运维的基础上，需要一线技术人员采取更为精准和有效的策略，并结合日常运维工作的经验才能够更好地完成铁路电力系统线路接地网的维护工作，确保铁路电力系统工作的安全性和稳固性。笔者以自己在京九南线一线工作的经验，分析了铁路电力接地网存在的问题，并提出相应的改进建议。

关键词：接地网;电力系统;变配电

中图分类号：U224.9文献标识码：A文章编号：1003-5168（2020）16-0124-03

Abstract： Power supply security of railway power system plays an important role in the whole railway system， which directly affects the operation of the railway system. Especially in recent years， with the rapid development of railway electrification， a large number of new equipment are widely used along the railway， and the requirements for connecting to the ground network are becoming higher and higher. On the basis of conventional power system operation and maintenance， it is necessary for front-line technicians to take more accurate and effective strategies， and combine the experience of daily operation and maintenance work to better complete the maintenance of the railway power system line ground network Work to ensure the safety and stability of railway power system. Based on the experience of working in the south line of Beijing Kowloon Railway， the author analyzed the existing problems of the railway power grounding network， and put forward corresponding improvement suggestions.

Keywords： grounding grid;power system;power transformation and distribution

近年來，铁路电力故障伴随铁路电气化的高速发展时有发生，如京九线南昌供电段赣州供电车间2019年全年共发生32起电力故障。通过对管内贯通、自闭线路和变配电所接地网情况进行调查后，发现确实存在一些问题，主要原因是：设备易受雷击（雷区）、电缆杆等设备杆接地电阻不达标（大部分设备处于山区）、避雷器老化等，对京九南线的运行造成严重影响[1]。

1 京九南线电力故障概况

1.1 接地问题

第一，接地引下线与主地网连接端的并沟线夹老化锈蚀，未及时更换[2]。接地装置的锈蚀是普遍存在的问题，对变配电所、区间设备杆及箱变的地网来说，最容易发生腐蚀的就是设备的接地引下线、并沟线夹，如图1所示。

第二，接地引下线及接地体的截面偏小。……