基于精确线长模型的输电线路故障测距研究  

Research of Transmission Line Fault Location Based on the Precise Line Length Model

作　　者：曾明杰[1] 谢源[1] 唐珂[1] 

机构地区：[1]上海电机学院电气学院,上海200240

出　　处：《电力学报》2016年第4期326-332,353,共8页Journal of Electric Power

摘　　要：传统的故障测距算法一般选用两基塔之间的档距作为线长模型。实际工程中由于弧垂的存在,使得档距和线长有较大误差。针对上述问题,首先引入了输电线路线长的悬链线方程。进而利用抛物线方程与悬链线方程的高度相似性,推导出了基于抛物线方程的线长模型,建立了单回输电线路双端测距模型。针对输电线路故障中最常见的单相接地短路故障做了仿真实例分析。验证了抛物线模型具有良好的适用性和精确度,较好的解决了长距离输电线路故障测距精度受线路长度影响的问题。Span between two adjacent tower was chosed as line length model in the traditional fault location algorithm. There is a big error in the actual project between span and wire length because of the existence of the line sag. In view of the above problems, the transmission line length of the catenary equation was introduced here at first. Then the wire length model of the parabolic equation was deduced based on the high degree of similarity between catenary equation and parabolic equation. In this paper, the double terminal fault location model of single circuit transmission line is established. Simulation analysis of real example is carried out on the fault of single phase to earth fault in transmission line fault. The parabolic model is proved to have good accuracy and applicability. It can solve the problem of fault location accuracy of long distance transmission line affected by wire length.

关 键 词：长距离输电线路 故障测距 抛物线模型 双端测距算法 单相接地短路 

分 类 号：TM755[电气工程—电力系统及自动化]