变电站直流系统寄生回路的排查方法探讨
袁成 ，孙银权 ，雷仲强 ，邰能灵
(1．上海市电力公司超高压输变电公司，上海200063；2．上海交通大学电气工程系，上海200240)
摘要：通过对变电站直流系统电压异常进行测试，分析了存在直流寄生回路的原因。对比分析常用的排查方法及技术方案，结果表明，采用直流钳形表的方法测电源正负极差流，采用试拉自动化系统直流、试拉二次保护直流的措施是有效可靠的。在此基础上，总结出产生直流寄生的主要诱因，主要有器件缺陷、设计缺陷以及管理原因等，对提高本地区电网的运行可靠性有重要意义。
关键词：直流寄生；隐患排查；直流试拉； 变电站；保护与控制系统
Abnorm al phenom enon discrim ination m ethod of DC parasitic loop for substation
YUAN Cheng ， SUN Yin．quan ， LEI Zhong．qiang ， TAI Neng—ling2
(1．Shanghai Extra High Voltage Power Transmission Company，Shanghai 200063，China；2．Department of Electrical Engineering，Shanghai JiaoTong University，Shanghai 200240，China)
Abstract： Based on measurement results ofthe abnorrnal DC system voltage，the reasons and the countermeas ures ofthe DC parasitic loop are an alyzed in this paper．Several investigation methods and technical program are proposed and compared，the discrimination methods include diferential current measurement between positive and negative polarity with DC pince instmment．testing break
method of DC source for automation system and protection system．Atier that，the causes of the DC parasitic loop are summarized，for example apparatus defection，design defection，management defection and SO on．It holds substantial essentiality in improving the reliability of the operation of regiona1 power grids．
Key words： DC parasitic loop： abnorm al phenomenon discrimination； DC testing trip： substation； protection and control system
中图分类号： TM76 文献标识码：B 文章编号： 1674．3415(2010)06—0137—04
发表于 2010-12-2 04:19:13
发表于 2011-6-20 18:09:44
