小电流接地系统故障定位新方法  

New Method of Fault Location in Small Current Grounding System

作　　者：张耘川[1] 苏宏升[1] 

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070

出　　处：《电力系统及其自动化学报》2015年第2期32-38,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61263004);铁道部科技研究开发计划项目(2012X003-B)

摘　　要：故障行波波头到达时刻、行波速度和线路弧垂是影响小电流接地系统故障行波定位的主要因素。在分析小电流接地系统故障特征、Hilbert-Huang变换(HHT)、行波测距的基础上,将HHT引入到故障行波波头的提取中,利用端点极值点平行延拓法来抑制HHT端点效应,并对传统的行波测距算法进行改进,消除了波速和线路弧垂对行波测距精度的影响。Matlab仿真结果表明所提方法在小电流接地系统故障定位中的有效性和准确性,并与小波变换方法进行了对比。The arrival time of fault traveling wavefront, traveling velocity and the arc sag of line are the main factors that influence the traveling wave fault location in small current grounding systems. On the basis of analyses of fault characteristic of small current grounding systems, Hilbert-Huang transform（HHT） and travelling waves fault location, HHT is introduced to obtain fault traveling wavefront, a new method based on parallel continuation endpoint is pro- posed to dampen the end effect of HHT, and improve the traditional traveling wave fault location to eliminate the effect caused by wave velocity and arc sag on accuracy of traveling wave fault location. Simulation results via Matlab indicate that using the proposed method can accurately and reliably achieve fault location in small current grounding system, and the proposed method is compared with wavelet transform method.

关 键 词：小电流接地系统 Hilbert—Huang变换 行波测距 端点效应 弧垂 故障定位 

分 类 号：TM77[电气工程—电力系统及自动化]