基于反射系数谱Z变换的电缆缺陷定位方法  

Cable defect location method based on Z transformation of reflection coefficient spectrum

作　　者：王尉军 陈旻 殷慧 李原 WANG Weijun;CHEN Min;YIN Hui;LI Yuan(Guiyang Power Supply Bureau,Guizhou Power Grid Co.,Ltd.,Guiyang 550004,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]贵州电网有限责任公司贵阳供电局,贵州贵阳550004 [2]四川大学电气工程学院,四川成都610065

出　　处：《绝缘材料》2024年第1期109-115,共7页Insulating Materials

基　　金：贵州电网公司科技项目(GZKJXM20210405);国家自然科学基金资助项目(51877142)。

摘　　要：针对传统缺陷定位函数分辨率较低且数据冗余度较高的问题,本文提出了一种基于反射系数谱Z变换的电缆缺陷定位方法。首先利用传输线理论建立了电缆的反射系数谱模型,分析反射系数谱定位电缆缺陷的可行性。然后介绍Z变换的原理,根据反射系数谱的特征确定Z变换算法中各参数的值,构建了新的电缆缺陷定位函数。缺陷定位实验的仿真与实测结果显示,相比于传统的方法,本文所提方法中电缆缺陷定位函数的分辨率更高,并且数据的冗余度更低,能更精准地定位电缆缺陷,同时可以减少干扰峰的影响,为电缆缺陷的定位提供了新的思路。Aimed at the problems of low resolution and high data redundancy in traditional defect location functions,we proposed a cable defect location method based on Z transformation of reflection coefficient spectrum.Firstly,a reflection coefficient spectrum model of cable was established by the transmission line theory,and the feasibility of locating cable defect by the reflection coefficient spectrum was analyzed.Then,the principle of Z transformation was introduced.On the basis of reflection coefficient spectrum characteristics,the parameter values in Z transformation algorithm were determined,and a new cable defect localization function was constructed.The simulation and test results of defect location experiment show that compared with the traditional methods,the proposed cable defect location function has higher resolution and lower data redundancy,which can locate cable defect more accurately and reduce the effect of interference peaks,providing a new idea for cable defect location.

关 键 词：电力电缆 频域反射法 反射系数谱 Z变换 缺陷定位 

分 类 号：TM755[电气工程—电力系统及自动化]