同杆双回输电线路的四点行波故障定位方法  

Four-point Traveling Wave Fault Location Scheme for Double Circuit Lines

作　　者：朱永利[1] 范国琛[2] 赵雪松 陈华 熊希[1] ZHU Yongli FAN Guochen ZHAO Xuesong CHEN Hua XIONG Xi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China State Grid Jinan Electric Power Company, Jinan 250012, China Maintenance Branch, State Grid Jibei Electric Pawar Comn~nv Rg~)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),保定071003 [2]国家电网济南供电公司,济南250012 [3]国网冀北电力有限公司检修分公司,北京102488

出　　处：《电力系统及其自动化学报》2016年第12期124-129,共6页Proceedings of the CSU-EPSA

基　　金：中央高校基本科研业务费专项资金资助项目(2014xs74)

摘　　要：超高压同杆双回线的对地分布电容和线间互感不可忽略,对故障定位精度和可靠性影响较大,本文提出基于相位比较和四点行波测距的同杆双回线故障定位方法。该方法使用多电流测点,采用分相相位比较判断故障区段,并对故障段进行波头检测和波速求解,运用区间最优化方法设置行波测点间距,由此形成由两个三点行波法组成的四点行波法确定故障点位置。仿真结果表明所提方法不仅可缩短行波双端间距,明显减小电流行波的畸变和衰减效应,而且可实现波速在线求解,在测点极性接反或本身故障导致相位比较发生误判时仍能准确定位,提高了定位可靠性,且精度不受线路长度的影响。The ground distributed capacitance and mutual inductance of EHV double circuit lines cannot be ignored, and they have a great impact on the fault location. In this paper, a fault location scheme based on phase comparison and four-point traveling wave fault location is presented for double circuit lines to improve the location accuracy and reliabil- ity. At multiple current measurement points, the proposed scheme uses phase comparison to determine the fault sec- tion, where the wave front is detected and the wave velocity is solved. The interval between measurement points is set by using section optimization method, and thus a four-point traveling wave fault location scheme is composed of two three-point traveling wave schemes. Simulation results show that the proposed scheme can shorten the distance between two ends, reduce the distortion and attenuation obviously, and achieve an online determination of wave velocity. The proposed scheme can effectively locate the fault when there exists phase comparison misjudgment caused by reverse po- larity and measurement fault. The reliability is improved and the accuracy is not affected by line length.

关 键 词：同杆双回线 故障定位 相位比较 行波故障测距 对地分布电容 极性接反 

分 类 号：TM711[电气工程—电力系统及自动化]