变压器零序电流保护选用电流互感器的探讨  

Discussion about choosing the current transformer used by zero sequence current protection for transformer

作　　者：刘华[1] 田芳[1] 张予鄂[1] 郭耀珠[2] 王敬军[1] 

机构地区：[1]河南省电力公司,河南郑州450052 [2]河南电力试验研究院,河南郑州450052

出　　处：《电力系统保护与控制》2010年第16期84-86,91,共4页Power System Protection and Control

摘　　要：变压器零序电流保护的引线取自中性点套管电流互感器和中性点间隙电流互感器,在主变端子箱内容易接错且不易发现,造成主变零序电流保护在线路故障时误动跳闸。通过对区内外故障特性的分析和推断、主变压器继电保护配置的阐述,指出变压器零序电流保护用开关电流互感器自产零序电流代替中性点套管电流互感器的零序电流,可以彻底杜绝此类事故的发生。The lead line selected from the neutral bushing CT and neutral clearance CT used for zero-sequence current protection is easy to be connected wrongly,which is difficult to find out,so it can cause the main transformer zero-sequence current protection mal operate when line fault occurs.Based on the characteristic analysis and deduction of external fault and the elaboration of main transformer relay protection configuration,this paper points out that in zero-sequence current protection using the zero-sequence current produced by switch CT to replace the zero-sequence current of neutral bushing CT can avoid the similar incidents completely.

关 键 词：变压器 套管 零序电流保护 端子箱 自产 

分 类 号：TM452.1[电气工程—电器]