一种零序差动保护的辅助选相元件  

New fault phase selection method for line zero-sequence current differential protection

作　　者：何谋超[1] 何奔腾[1] 张武军[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力系统保护与控制》2008年第15期41-45,共5页Power System Protection and Control

摘　　要：针对零序差动保护不具备分相电流差动保护的选相功能,提出了一种新的零序电流差动保护辅助选相方法,利用零负序差流的关系以及各相差流的大小关系配合进行选相。通过EMTP和Matlab软件对1000 kV示范线路进行了仿真,结果表明,该选相元件在各种区内高阻故障条件下均能准确、快速地选相。Zero-sequence differential protection can＇t select the fault phase correctly on its own as the current differential protection, this paper puts forward a new fault phase selector of zero-sequence differential protection, uses the relations of zero-sequence and negative-sequence differential current and the magnitude of three phase line differential current. It simulates 1000 kV transmission lines with EMTP and MATLAB software, and the results verify that the fault phase selector can select the fault phase correctly and fast.

关 键 词：零序电流差动保护 故障选相 线路保护 序分量 

分 类 号：TM773[电气工程—电力系统及自动化]