应用于输电线路故障测距的行波波速仿真分析  

A Simulation Analysis of Traveling Wave Velocity for Fault Location of Transmission Lines

作　　者：曾志明 凌志勇[1,2] 袁宜真 谷湘文 

机构地区：[1]湖南工业大学电气与信息工程学院,湖南株洲412007 [2]国家电网湖南省电力公司株洲供电公司,湖南株洲412011 [3]广东电网肇庆怀集供电局,广东怀集526499

出　　处：《湖南工业大学学报》2017年第4期32-38,共7页Journal of Hunan University of Technology

基　　金：湖南省研究生科研创新基金资助项目(CX2017B684)

摘　　要：基于输电线路故障时产生的暂态行波进行故障定位,既能满足超高压输电线路对保护装置迅速动作的速度要求,还能对故障进行精确定位,且基本不受故障类型的影响。影响行波故障测距精度的主要因素有行波的速度和行波波头准确到达时刻的标定。针对常用的行波波速确定方法——公式法和在线测量法,通过在不同线路长度、不同故障距离下的仿真分析得到相对应的行波波速,并将所得到的波速用于同一故障距离测量,通过对测距结果对比分析,找出在某种故障距离下的最优波速,从而达到提高测距精度的效果。通过仿真分析发现,在线实时测量波速在合适范围内的测距精度比固定波速的测距精度高,满足规范标准对测距误差不超过1%的要求。Based on the transient traveling wave generated by the fault of the transmission line,which can meet the requirement in terms of speed for high speed transmission lines in quick response to the protective devices,and can achieve an accurate location of the faults without being affected by the fault type.The main factors influencing the accuracy of traveling wave fault are the speed of traveling wave and the calibration of the arrival time of the traveling wave heads.In view of the commonly used methods for determining the wave speed of lines：formula method and online measurement method,the corresponding traveling wave velocity can be obtained by simulation analysis at different line lengths and different fault distances.The obtained wave velocity is used for the same fault distance measurement.A comparison and analysis made of the ranging results helps to determine the optimal wave velocity at some fault distance,thus improving its ranging accuracy.A simulation analysis shows that the accuracy of the on-line real-time measurement of the wave velocity is higher than that of the fixed wave velocity in appropriate ranges,which meets the requirement of the standard deviation within 1%.

关 键 词：输电线路 故障测距 暂态行波 行波波速 

分 类 号：TM452[电气工程—电器]