一种新的高压线路振荡选相元件  

New Fault Phase Selector for High Voltage Transmission Line Protective Relaying During Power Swing

作　　者：索南加乐[1] 刘凯[1] 刘世明[2] 焦在滨[1] 张怿宁[1] 李小滨[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]烟台东方电子信息产业股份有限公司,烟台264001

出　　处：《西安交通大学学报》2007年第8期949-953,共5页Journal of Xi'an Jiaotong University

基　　金：国家科技攻关计划资助(2005BA208C);国家"十一五"重点科技(攻关)计划资助项目(ZZ03-07-01-05-03)

摘　　要：提出了一种基于阻抗相对变化的高压线路保护选相新原理,用作振荡期间的选相元件.对接地故障,利用零序、负序电流之间相位差进行分区,每个分区包括某相单相接地和另外两相短路接地两种故障,根据故障环上的测量阻抗为一恒定数值,而非故障环上的测量阻抗随振荡变化这一特征,来得到选相结果.本元件提高了振荡中不对称接地故障的选相速度,不受系统运行方式和分支系数的影响,且易于实现,在现有的微机保护装置中可以直接使用.动模数据仿真表明,新选相元件具有较快的选相速度,文中算例可以在60 ms内选出故障相.Based on the relative variation of impedance during power swing, a novel phase selector for high voltage transmission lines is proposed. When a grounding fault occurs, the fault is divided into three regions according to the phase-angle between the zero sequence and negative sequence components of the current, and each region contains one kind of single-phase-to-ground fault and the other kind of other two phase-to-phase-with-ground fault. Aiming at the characteristic that the measured impedance remains constant in faulty phase and variable in sound phase, the fault phase can be selected. The proposed phase selector enables to select the fault phase quickly during power swing, and different system cases have no effect on the selector. The performance of the proposed method is evaluated with the data created by dynamic model system, and the results show that the selector is able to identify fault phases within 60 ms.

关 键 词：电力系统 线路保护 振荡 选相元件 

分 类 号：TM733[电气工程—电力系统及自动化]