一种电缆-架空线混联线路故障测距改进单端法  

An Improved Method of One-terminal Fault Location for Hybrid Power Cable-overhead Line

作　　者：王晨 叶江明[1] 陈昊 饶代阳 WANG Chen;YE Jiangming;CHEN Hao;RAO Daiyang(Nanjing Institute of Technology,Nanjing 211167,China;State Grid Jiangsu Electric Power Company Maintenance Branch Company,Nanjing 211102,China;NARI Technology Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]南京工程学院,江苏南京211167 [2]国网江苏省电力有限公司检修分公司,江苏南京211102 [3]国电南瑞科技股份有限公司,江苏南京211106

出　　处：《湖南电力》2020年第4期27-31,共5页Hunan Electric Power

基　　金：国家自然科学基金资助项目(51807028)。

摘　　要：在"电缆-架空线"混联输电线路形式中,由于电缆和架空线的阻抗角差别较大,因而整条混联线路阻抗不再连续。传统单端测距算法如果忽视两者之间的线路参数差异势必会对故障定位的准确性产生较大影响。在阻抗均匀化处理方法的基础上,提出一种基于分段参数推导的改进单端测距算法。对阻抗角不同的电缆和架空线路段作阻抗分段均匀处理,用分段参数推导法推导分段故障测距公式,得出分段故障距离表达式。基于MATLAB对混联线路进行建模仿真,对比算法改进前后的仿真结果,进行误差分析与归纳总结,结果表明改进后分段参数推导法的测距误差更小。In the“power cable-overhead line”hybrid transmission line,the line impedance is no longer continuous because the impedance angle of the cable and overhead line is different.If the line parameter difference is ignored,the traditional single-terminal distance measurement algorithm has great influence on the accuracy of fault location.In this paper,an improved single-terminal distance measurement algorithm based on piecewise parameter derivation is proposed based on the impedance homogenization processing method.The impedance of cables and overhead line sections with different impedance angle is segmented evenly.The segmental fault location formula is derived by the segmental parameter derivation method,and the expression of segmental fault distance is presented.Using MATLAB,the hybrid line is modeled and simulated.By comparing the simulation results,error analysis and summary are made.The results show that the distance measurement error of the improved subsection parameter derivation method is smaller.

关 键 词：混联输电线路 故障测距 单端法 阻抗均匀化 误差分析 

分 类 号：TM773[电气工程—电力系统及自动化]