基于非同步电压的T型输电线路故障定位新方法

作者：王波1，黄世晅2，陈晓刚2 日期：2010-06-28/span> 浏览：3683 查看PDF文档

基于非同步电压的T型输电线路故障定位新方法
王波1，黄世晅2，陈晓刚2
 (1.浙江大学 电气工程学院，浙江 杭州 310027; 2.杭州电力局，浙江 杭州 310009)

摘要：针对T型输电线路，提出了一种利用非同步电压相量进行故障定位的新方法。该方法首先运用对称分量法和线性叠加原理建立了故障后的附加正序网络，并且定义了故障点的搜索指标。进而基于该指标运用遍历搜索方法寻找故障点的位置。该算法仅利用电压幅值进行计算，因而避免了由电流互感器饱和所带来的误差影响，且无需电压同步。基于PSCAD的仿真实验表明该方法能够有效地定位T结构线路的短路故障，并且不受故障类型、过渡电阻等因素的影响。
关键词：故障定位；同步电压相量；附加正序网络;对称分量法
中图分类号：TM712文献标识码：A文章编号：1001-4551(2010)04-0100-04

Novel fault location method for Tterminal lines
based on unsynchronized voltage phasor

WANG Bo1, HUANG Shixuan2, CHEN Xiaogang2
(1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;
2. Hangzhou Municipal Electric Power Bureau, Hangzhou 310009, China)

Abstract: Aiming at the Tterminal transmission lines, a novel fault location method using unsynchronized voltage phasor was presented. On the basis of symmetrical component method and linear superposition principle, the additional positive sequence network was established and the matching index on fault point was proposed. Then with this index the fault can be located by traversing searching method. By only using synchronized voltage phasor, the fault location accuracy of this method was not affected by the saturation of current transformer, and without synchronization. The simulations were carried out based on PSCAD. The result shows that the proposed technique can locate shortfault point on Tterminal transmission lines accurately and adaptively, with no influence from factors, such as fault resistance, fault type and so on.
Key words: fault location; synchronized voltage phasor; additional positive sequence network; symmetrical component method