摘 要：转子接地故障现象在水电站时有发生，轻则一点接地报信号故障，如果发生两点接地就会严重会影响机组设备、系统的安全运行，通过多次对电站直流系统接地的分析，特别是对直流回路的碳刷、磁极线圈、引线的绝缘研究。对双滩水电站的实际案例分析和对故障的处理，确定了直流系统故障处理时应该重点思考的故障点，从而为电力系统发电机组出现类似问题有针对性地提出解决思路和指导方法。
关键词：磁极；轴领；盘车；操作油管
中图分类号：TM862 文献标识码：A 文章编号：2096-4706（2020）08-0051-03
Analysis and Treatment of DC System Grounding Fault
LI Zhiqiong
（Sichuan Bahe Hydropower Development Co.，Ltd.，Bazhong 636400，China）
Abstract：Rotor grounding fault often occurs in hydropower stations. If there is light grounding fault，one point grounding will report signal fault. If two-point grounding occurs，it will seriously affect the safe operation of the unit equipment and system. Through the analysis of the grounding of the DC system of the power station for many times，especially the insulation research of the carbon brush，pole coil and lead wire of the DC circuit. Based on the analysis of the actual case of Shuangtan hydropower station and the treatment of the fault，the fault points that should be considered in the DC system fault treatment are determined，so as to put forward the solutions and guidance methods for the similar problems of the power system generating units.
Keywords：magnetic pole；shaft collar；turning gear；operating oil pipe
参考文献：
[1] 练静，杨晓斌. 对直流系统接地故障的分析与处理 [J]. 中国科技信息，2008（18）：132.
[2] 陈肇辉. 变电站直流系统接地故障的处理方法 [J]. 广东科技，2008（20）：118-119.
[3] 徐海明，王全胜. 变电站直流电源设备使用与维护 [M].北京：中国电力出版社，2007.
作者简介：李志琼（1982.07—），女，汉族，四川巴中人，电气工程师，本科，研究方向：水利发电。