变电站直流系统两段母线串电分析  

Analysis of Two Sets of Substation DC Busbars of Which Cathode and Anode Are Mixed to Connect

作　　者：李修金[1] 王乃科[2] 邓洁清[1] 袁宇波[1] 孙天宇[2] 

机构地区：[1]江苏省电力公司电力科学研究院,江苏南京211103 [2]无锡供电公司,江苏无锡214031

出　　处：《江苏电机工程》2011年第3期38-40,共3页Jiangsu Electrical Engineering

摘　　要：直流系统正常对于变电站安全稳定运行意义重大。通过实际案例,介绍了两段直流正负极串电的现象,并对建立等效电路模型进行分析,利用电路的基本原理对等效电路模型进行化简,说明了两段直流正负极串电导致两段母线同时接地报警的原因,分析了两段母线串电带来的危害,同时提出了查找串电点的有效方法。The normal operation of DC system is of great significance to the safety and stability of substation.Through actual cases,the phenomenon of two set of DC busbars of which cathode and anode are mixed to connect is introduced.And the equivalent circuit model is built and analyzed,which is simplified by the basic circuit principle.The reasons for grounding alarm caused by two sets of DC busbars of which cathode and anode are mixed to connect are illustrated.In addition,the damage of two sets of DC busbars of which cathode and anode are mixed is also analyzed,and effective methods to search the electric mixed point are also proposed.

关 键 词：直流接地 直流串电 分布电容 小信号注入 

分 类 号：TM645[电气工程—电力系统及自动化]