高压电缆外护套特征阻抗建模及破损检测方法  

Characteristic impedance modeling and damage detection method for high-voltage cable sheath

作　　者：张泽晋 陈彦伊 廖雁群 朱五洲 黄贝思 张高博文 刘刚[1] ZHANG Zejin;CHEN Yanyi;LIAO Yanqun;ZHU Wuzhou;HUANG Beisi;ZHANG Gaobowen;LIU Gang(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China;Zhuhai Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhuhai,Guangdong 519000,China)

机构地区：[1]华南理工大学电力学院,广州510641 [2]广东电网有限责任公司珠海供电局,广东珠海519000

出　　处：《浙江电力》2024年第9期78-87,共10页Zhejiang Electric Power

基　　金：国家自然科学基金面上项目(51977083);中国南方电网有限责任公司科技项目(CG03000620016452)。

摘　　要：高压电缆是城市电网的主要输电通道,其外护套破损会导致线路输送容量下降以及电缆短路、击穿等。因此,有必要探究高压电缆外护套破损检测与定位方法。针对传统方法效率较低且受敷设环境限制等问题,提出一种基于TFDR(时频域反射法)的检测与定位方法。建立平行敷设直埋高压电缆外护套的特征阻抗模型,将外护套结构纳入传输线模型;利用TFDR对外护套破损导致的特征阻抗变化进行检测与定位。通过仿真验证,初步证明了该方法的可靠性。选取两根长约40 m的平行敷设XLPE(交联聚乙烯)电缆进行了外护套破损实验,实验结果表明,所提方法能准确检测出高压电缆外护套破损。High-voltage cables are the main transmission channels in urban power grids.Damage to their sheath can lead to a reduction in transmission capacity,as well as cable short circuits and breakdowns.Therefore,it is neces⁃sary to explore methods for detecting and locating damage to high-voltage cable sheath.Addressing the issues of low efficiency and environmental constraints of traditional methods,a detection and location method based on TFDR(time-frequency domain reflectometry)is proposed.A characteristic impedance model for the sheath of directly bur⁃ied high-voltage cables laid in parallel is established,incorporating the sheath structure into the transmission line model.TFDR is utilized to detect and locate characteristic impedance changes caused by damage to the sheath.Simulation verification initially demonstrates the reliability of this method.Two parallel-laid XLPE(cross-linked polyethylene)cables,each approximately 40 meters long,are selected for sheath damage experiments.The experi⁃mental results indicate that the proposed method can accurately detect damage to the sheath of high-voltage cables.

关 键 词：高压电缆外护套 特征阻抗模型 时频域反射法 故障检测 缺陷定位 

分 类 号：TM75[电气工程—电力系统及自动化]