基于输入阻抗谱的电力电缆本体局部缺陷类型识别及定位  

Identification and Location of Local Defects in Power Cable Body Based on Input Impedance Spectroscopy

作　　者：李蓉[1] 周凯[1] 万航 谢敏 饶显杰 Li Rong;Zhou Kai;Wan Hang;Xie Min;Rao Xianjie(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Wuxi Power Supply Company,Wuxi 214000,China)

机构地区：[1]四川大学电气工程学院,成都610065 [2]国家电网无锡供电公司,无锡214000

出　　处：《电工技术学报》2021年第8期1743-1751,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51877142)。

摘　　要：为解决局部放电(PD)法和反射系数谱(RCS)法在电力电缆本体局部缺陷类型识别及定位方面存在的不足,提出一种基于输入阻抗谱的电力电缆本体局部缺陷类型识别及定位方法。首先,依据电力电缆分布参数模型,通过仿真分析,得到含有容性/感性缺陷的电力电缆输入阻抗谱特征。然后,运用电力电缆输入阻抗谱、Kaiser窗实现对电力电缆局部缺陷的高灵敏度定位,得到具有直观性的定位谱图。最后,在实验室13m长的电力电缆上制作两种局部缺陷样本(铜屏蔽层缺损缺陷与热老化缺陷),用于验证所提方法的有效性。仿真和实验结果表明,该方法对长度大于5cm或电容变化大于±5%的局部缺陷具有较高的识别灵敏度,不仅能对电力电缆本体局部缺陷类型进行识别,还能实现对微弱缺陷的有效定位。In order to solve the shortcomings of partial discharge(PD)method and reflection coefficient spectrum(RCS)method in local defect identification and location in power cable body,a method is proposed based on input impedance spectrum.Firstly,the input impedance spectrum characteristics with capacitive/inductive defects were analyzed by simulation based on the distributed parameter model of the power cable.Then,the input impedance spectrum and Kaiser window were used to locate the local defects in power cables with high sensitivity,and the location spectrum was extremely intuitive.Finally,to verify the effectiveness of the proposed method,two kinds of local defect samples(copper shield defects and thermally aged defects)were made on a 13m long power cable in the laboratory.The results indicate that this method has high recognition sensitivity for local defects with a length of more than 5cm or a change in capacitance more than±5%.The method can not only identify the local defect types of power cable body,but also effectively locate the local weak defects.

关 键 词：输入阻抗谱 电缆本体 缺陷类型识别 局部缺陷定位 KAISER窗 

分 类 号：TM75[电气工程—电力系统及自动化]