110kV三相交叉互联电缆的频变模型及局放仿真分析  

Partial Discharge Simulation Analysis and Frequency-dependent Model for 110 kV Three-phase Cross-bonded Cable

作　　者：王伟[1] 王永亮 刘冲 李应利 张德文[1] 孙运涛[1] 王巍巍[1] 

机构地区：[1]高电压与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206 [2]银川兴庆区供电局,宁夏回族自治区银川市750001 [3]温州供电局,浙江省温州市325028 [4]中卫供电局,宁夏回族自治区中卫市751700

出　　处：《中国电机工程学报》2011年第1期117-122,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB-724506);国家自然科学基金项目(50777020)~~

摘　　要：由于技术上和经济上的优点,交联聚乙烯(cross-linked polyethylene,XLPE)电缆在高压和超高压领域的应用越来越多。局部放电检测是判断电缆绝缘状况的有效的方法,交叉互联电缆系统中的局部放电信号存在复杂的互扰问题,给实际带电检测带来很大的困难,有必要分析交叉互联电缆系统中局部放电的传播特性。研究表明,半导电层对局部放电信号的高频分量有着严重的衰减和色散作用,基于Blackburn等学者提出的改进型电缆模型的原理,经过适当调整参数,建立了三相交叉互联电缆系统的J-Marti频变模型,并对该系统中局部放电的传播特性进行了仿真分析和试验验证。试验结果表明:该模型能够合理地解释局部放电信号在三相交叉互联电缆系统中的传播规律。Cross-linked polyethylene（XLPE） insulated power cables are increasingly used in high voltage and extra high voltage engineering due to technical and economical advantages.Partial discharge（PD） detection is the most effective method for testing the cable＇s insulation condition.However,PD signals in cross-bonded cable systems are interfered by each other,which brings about great difficulty in online PD detection,and therefore it is indispensable to research on the propagation characteristics of PD in cross-bonded XLPE cable systems through simulation and experiment.Present research results indicate that extruded semi-conducting layers in cables have a serious attenuation and dispersion effect on the high frequency components of PD.Based on the improved cable model proposed by Blackburn,and through properly adjusting parameters,a J-Marti frequency-dependent model for three-phase cross-bonded cable systems was established;and the PD propagation characteristics in this model were explored.Experimental results showed that this model can reasonably explain the propagation characteristics of PD signals in three-phase cross-bonded cable systems.

关 键 词：频变模型 半导电层 局部放电信号 三相交叉互联电缆 

分 类 号：TM743[电气工程—电力系统及自动化]