架空线-电缆-架空线混合线路故障定位方法研究  

Study on the Fault Location Method of Overhead-cable-overhead Hybrid Lines

作　　者：覃思明 李燚 QIN Siming;LI Yi(School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学机电工程学院

出　　处：《广西电力》2019年第4期24-28,共5页Guangxi Electric Power

摘　　要：为了解决波速不准确对混合线路故障定位的影响,提出一种架空线-电缆-架空线混合线路故障定位新方法。首先,通过检测各区段的零序电流幅值差异度,实现故障大区段检测;然后,基于纯架空线或纯电缆线路的波速相同特性,通过检测故障行波首次到达故障区段两端的时间,实现故障小区段检测,进一步缩小故障区段;最后,结合三端行波法对架空线-电缆-架空线混合线路进行故障测距。仿真结果表明,该方法简单,高效,抗干扰能力较强,测距精度满足要求。In order to solve the influence of the inaccurate wave speed on the fault location of hybrid lines,a new fault location method of overhead-cable-overhead hybrid lines is proposed.Firstly,the detection of the large section to which the fault belongs is realized by the detection of the amplitude difference of the zero sequence current of each section.Then,based on the characteristics of the same wave speed among pure overhead lines or pure cable lines,the detection of the small section to which the fault belongs is realized by the detection of the first arrival times when the fault traveling wave reaches the two terminals of the fault section so that the fault section is further narrowed.Finally,combined with the three-terminal traveling wave method,the fault location of the overheadcable-overhead hybrid line is achieved.Simulation results show that the method,which is simple and efficient,has strong antiinterference ability and meets the accuracy requirement of fault location.

关 键 词：混合线路 故障定位 波速 零序电流 

分 类 号：TM75[电气工程—电力系统及自动化]