高压交联电缆局放传播特性分析及试验研究  

Characteristic analysis and experimental research on PD pulse propagation in HV XLPE cables

作　　者：王昱力[1] 杨丹[1] 夏荣[1] 

机构地区：[1]中国电力科学研究院武汉分院,湖北武汉430074

出　　处：《武汉大学学报（工学版）》2015年第2期230-233,268,共5页Engineering Journal of Wuhan University

摘　　要：局部放电信号在高压交联电缆中的衰减传播规律是实现局部放电精确测量与放电源定位的重要理论基础之一.首先对局部放电信号沿电缆传播特性展开分析,并分别采用35、110、220kV高压交联电缆构建了局部放电脉冲注与测量系统,对高压交联电缆局部放电脉冲传播特性进行了试验研究与分析,通过计算分析比较了不同频率的脉冲信号在电缆中的传播和衰减系数.结果表明,电缆对局放脉冲有显著的高频衰减效应,沿电缆传播的陡上升沿脉冲信号会随传播距离的增长而严重衰减;同时,半导电层对局放信号具有明显的衰减作用,在高压电缆局放精确测量与定位中即便采用分布式传感器就近采集信号也仍需对局放信号做出衰减补偿.The attenuation and propagation characteristics of partial discharges in high voltage XI.PE cable is a critical theoretical basis to achieve precise detection and positioning of partial discharges. In this paper, the propagation characteristics of partial discharges have been analyzed; simulating partial discharge test system of composed by 35kV, 110kV and 220kV XLPE power cables is constructed to study the propaga- tion characteristics in high voltage XLPE cables. Moreover, propagation and attenuation coefficient of par- tial discharge in different frequencies are compared through calculating and analyzing. The results show that the cables have significant high frequency filtering effect on partial discharge and steep rising edge pul- ses would severely attenuate with the growth of cable length. Meanwhile, semiconducting layer has signif- icant effects on partial discharge attenuation; therefore, in precise detection and positioning of partial dis- charges in HV XLPE cable lines, attenuation compensation should be adopted, even in the distributed measurement system.

关 键 词：高压交联电缆 局部放电 半导电层 传播特性 

分 类 号：TM75[电气工程—电力系统及自动化]