摘要高压电缆-架空线混合线路故障测距是现今的研究热点，其研究基础是行波法理论。但混合线路复杂多变，线路参数不统一，传统的单一线路故障测距行波法不能完全运用在这里，需要进行改进。行波法虽应用广泛，但是行波运动复杂多变，难以准确检测。而小波分析法很好的解决了这一问题，利用小波变换模极大值理论对相模变换后的暂态行波信号进行分析，准确测得暂态行波到达线路两端的时间。再利用时间变量，将线路的每段空间长度转化为时间长度，根据时间关系寻找故障点，完成故障测距。26778
论文在研究了已有故障测距方法的基础上，简单介绍了行波法和小波变换的相关概念，阐述了基于时间变量的双端行波故障测距法的原理，最后搭建线路模型，运用MATLAB软件进行仿真实验。
关键词  故障测距  混合线路  行波法   小波分析
毕业论文设计说明书外文摘要
Title  Research on A Fault Location Method for Hybrid Transmission Lines of Power Cables and Overhead Lines                    
Abstract
The fault location for hybrid transmission lines of power cables and overhead lines is the current research focus. The research is based on the theory of traveling wave method. But the hybrid transmission lines are complex and changeable, and the parameters are not unified. So the traditional traveling wave method of the single line’s fault location can not completely be used, and it needs to be improved. The traveling wave method is widely used, but the wave motion is complicated and difficult to accurately detected. We know the wavelet analysis method is a very good solution to this problem by using the wavelet transform modulus maxima theory to analyze the transient traveling wave signal after phase-mode transformation and measure the transient traveling  wave’s arrival time at both ends of the transmission line. To use the time variable, we can change the line length of each section of the space into the length of time and find the fault point according to the time. Then we can complete the fault location.Based on the study of the existing methods of fault location, this paper briefly introduces the related concepts of the traveling wave method and wavelet transform, and describes the principle of the double terminal traveling wave fault location method based on the time variable. Finally, we build the circuit model, and the simulation experiments are carried out using  the  MATLAB software.
 Keywords   Fault Location  Hybrid transmission lines  Traveling wave method   Wavelet Analysis
 目   次
1  绪论    1
1.1  课题研究背景和意义    1
1.2  故障类型和故障测距要求    1
1.3  故障测距方法综述    2
1.4  本文主要工作    3
2  输电线路的行波理论    5
2.1  行波基本理论    6
2.2  行波检测原理    9
2.3  三相线路行波的解耦    10
2.4  行波信号的选择    13
2.5  本章小结    13
3  小波分析基本理论    13
3.1  小波变换简介    14
3.2  二进小波变换    14
3.3  基于小波分析的奇异性检测    15
3.4  多分辨率分析与Mallat算法    16
3.5  小波的选取    17
3.6  本章小结    18
4  基于时间变量的混合线路故障测距方法原理    18 MATLAB高压电缆-架空线混合线路故障测距方法研究:http://www.751com.cn/zidonghua/lunwen_21052.html