一种用于零、负序电流纵差保护的实用选相元件  

Practical Fault Type Selection Method for Line Zero and Negative Sequence Current Differential Protection

作　　者：常宝波[1] 段玉倩[2] 贺家李[3] 张进[1] 

机构地区：[1]山东省烟台东方电子信息产业股份有限公司保护事业部,山东省烟台市264000 [2]中国南方电网技术研究中心,广东省广州市510623 [3]天津大学电气与自动化工程学院,天津市300072

出　　处：《电力系统自动化》2005年第20期76-80,共5页Automation of Electric Power Systems

摘　　要：提出了一种基于线路两端相电流的选相元件,具有不受系统运行方式、交流电压回路异常、系统振荡影响等特点。此选相元件仅通过比较三相差流幅值的大小关系,即可达到选相的目的。理论分析及大量的仿真实验表明:该选相元件性能良好,具有很高的灵敏性和准确性,完全可以作为纵联零序及负序差动保护的选相元件,以达到零、负序纵联差动保护单相跳闸的目的。A fault type selection method based on current obtained from both the local end and the remote end of a transmission line is presented. The proposed phase selection element uses the relations of three phase line differential current magnitude to identify the fault in the power system. Power swing and loss of potential, etc. have no effect on it. The MATLAB simulation and RTDS test results show that the phase selection element has high performance and can cooperate with the negative sequence and zero sequence current differential element in single pole trip.

关 键 词：选相元件 三相差流 纵联零序差动保护 纵联负序差动保护 

分 类 号：TM77[电气工程—电力系统及自动化]