火电厂低压厂用电系统接地保护误动问题分析  

Analysis of Grounding Protection Misoperation of Low-voltage Auxiliary Power System in Power Plant

作　　者：袭奂毅 王青春 郭凯 

机构地区：[1]内蒙古京隆发电有限责任公司,内蒙古乌兰察布012100

出　　处：《内蒙古电力技术》2015年第2期31-34,共4页Inner Mongolia Electric Power

摘　　要：针对某火电厂低压厂用电系统接地保护误动问题,分析主要原因为零线、接地线混用,剩余电流互感器接线不正确,三极断路器设置不当对剩余电流产生影响以及部分保护整定不合理,对此采取了规范零线、接地线使用,正确连接剩余电流互感器,将配置不当的三极断路器改为四极断路器以及核算保护定值的措施。实施后校验保护合格,再未发生保护误动情况,提高了厂用电系统的可靠性。This article focused on grounding protection misoperation for the low voltage system in a power plant. The main cause of grounding protection misoperation was that the zero wire was mixed with ground wire, the residual current transformer was in incorrect wire connection, the improper influence of three-pole switches, and some reasonable protection setting. Measures based on the standard use of the neutral and grounding wires, the residual current transformer, and the innovative installation of four-pole switches were put forward to improve the reliability of the power system.

关 键 词：低压厂用电系统 TN-S系统 接地保护 剩余电流 四极断路器 保护灵敏度 

分 类 号：TM774.1[电气工程—电力系统及自动化]