文档介绍：华北电力大学(保定)
硕士学位论文
电缆-架空线混合线路故障行波测距方法的研究
姓名:耿伟超
申请学位级别:硕士
专业:电气工程;电工理论与新技术
指导教师:赵书涛
2011-06
摘要
摘要
随着电力电缆在我国越来越广泛的应用,近年来电力系统出现了大量电缆与
架空线混合的电力线路,因此电力线路故障也越来越复杂。故障定位技术能缩
短故障的查找时间,对于快速恢复供电具有重要的作用。
本文首先分析了行波法故障测距技术的原理,利用 ATP/EMTP 软件对典型
的电缆-架空线混合线路故障进行仿真,并总结了故障波形的变化规律。然后针对
测试信号小波消噪法中阈值的确定问题,对比不同阈值法的消噪效果,提出了一种
基于传统软、硬阈值法的改进的阈值计算方法。接着阐述了小波分析法中模极大值
线搜索算法寻找故障信号奇异点的原理,针对电缆-架空混合线路上行波信号在连
接处发生突变的特点,提出了一种适合电缆-架空混合线路故障的行波测距方
法。最后设计了电力电缆-架空线混合线路故障测距系统,包括硬件部分和软件部
分,实现了故障测试信号的消噪、分析处理、故障距离计算和测试数据保存等功能。

关键词:故障定位;电缆-架空线混合线路;仿真;消噪;奇异点检测
I
Abstract
Abstract
Along with the power cable is used more and more widely in our country recent
years, Power system appeared a lot of power cable and overhead line mixed electric
transmission lines, therefore the fault of electric transmission lines is also more and more
complicated. Fault location technology can shorten the finding time of electric
transmission line troubles, which has the vital role for quick restore power.
Firstly, the principle of Traveling wave method fault location technology is analyzed
in this paper, emulate to all kinds of cable-overhead line mixed electric transmission line
fault with the software, and summarize the change rule of fault waveform. Secondly, for
the problem of threshold determination in wavelet threshold de-noising of the test signal
comparing the effects of different threshold value de-noising method, for the problem of
threshold determination in wavelet threshold de-noising of the test signal, an improved
threshold value calculation method is proposed, which is based on traditional soft and
hard threshold value method. Thirdly, the theory that how to check fault signal
singularities with modulus maxima line search algorithm in wavelet analysis method is
expound, according to the characteristics of traveling wave signal happens in the joints of
cable-overhead line mixed electric transmission lines, we proposed a new Traveling
wave method