中压电缆信道特性判别绝缘与半导电材料老化劣化状态方法  

Method on Distinguishing Aging and Deterioration Condition of Insulation and Semi-conductive Materials via Channel Characteristics of Medium Voltage Cable

作　　者：李陈莹 陈杰 刘建 胡丽斌 王昱力 谭笑 曹京荥 张伟 LI Chenying;CHEN Jie;LIU Jian;HU Libin;WANG Yuli;TAN Xiao;CAO Jingying;ZHANG Wei(State Grid Jiangsu Electric Power Co.,Ltd.Electric Power Research Institute,Nanjing 211103,China;Wuhan Branch of China Electric Power Research Institute Co.,Ltd.,Wuhan 730074,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,南京211103 [2]中国电力科学研究院有限公司武汉分院,武汉430074

出　　处：《高压电器》2025年第3期168-175,共8页High Voltage Apparatus

基　　金：基金国家电网公司总部科技项目(5700-202118195A-0-0-00)。

摘　　要：为了研究老化劣化对中压电缆信号传播的影响规律,分别研究了中压电缆中电磁场传播关键介质材料,包括绝缘层材料交联聚乙烯和半导电屏蔽层材料交联聚乙烯掺杂导电炭黑复合材料,经过热老化之后介电参数的变化对信道模型的影响。首先,采用分布式阻抗网络分析建立了中压电缆信道仿真模型,获得了未老化状态信道特征参数。其次,研究了交联聚乙烯绝缘材料半导电屏蔽材料加速热老化之后力学性能电学性能的变化规律,发现交联聚乙烯老化之后介电常数增大、损耗增大,半导电屏蔽材料电导率下降、损耗增大。最后,将材料老化前后关键参数带入电缆信道模型中计算获得了老化劣化对电缆信道特征参数影响规律,发现特征参数随老化程度加深逐渐下降。In order to study the influence of aging degradation on signal propagation of medium voltage cable,the influence of dielectric parameters of key dielectric materials in the electromagnetic propagation of medium voltage cable,including the insulation material of cross-linking polyethylene and the semi-conductive shield material of cross linked polyethylene doped conductive carbon black composites,on the channel model after thermal aging is studied respectively.Firstly,a simulation model of medium voltage cable channel is set up by the distributed impedance network analysis,and the characteristic parameters of unaged state channel are obtained.Then,the variation of mechanical and electrical properties of XLPE insulating material and semi-conductive shielding material after accelerated thermal aging is studied.It is found that the dielectric constant and the loss increase after aging of XLPE,while the conductivity of semi-conductive shielding material decreases and the loss increases.Finally,the key parameters of the material before and after material aging are brought into the cable channel model to calculate the influence of aging deterioration on cable channel characteristic parameters,finding that the characteristic parameters decrease gradually with the extend of aging.

关 键 词：中压电缆 老化 信道特性 交联聚乙烯 半导电材料 

分 类 号：TM75[电气工程—电力系统及自动化] TM247[一般工业技术—材料科学与工程]