10 kV XLPE电缆中间接头复合缺陷电场分布仿真研究  

Simulation Research on Electric Field Distribution of 10 kV XLPE Cable Intermediate Joint Defect

作　　者：邓镓屹 王星华[1] 聂一雄[1] DENG Jiayi;WANG Xinghua;NIE Yixiong(Department of Electrical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学电气工程系,广州510006

出　　处：《电线电缆》2023年第5期47-53,共7页Wire & Cable

基　　金：中国南方电网公司科技项目(030600KK52210023)。

摘　　要：以10 kV交联聚乙烯(XLPE)电缆中间接头为研究对象,基于Ansys Maxwell平台建立电缆中间接头的3D模型,除考虑气隙、受潮、导电颗粒和针尖等典型单一缺陷对电场分布的影响外,还结合现场实际安装过程,在较薄弱的部位施加几种复合缺陷,通过有限元计算分析中间接头内部的电场分布情况。结果表明:中间接头内部主绝缘存在复合缺陷时,缺陷处的电场强度随着其深度加深而不同,即使是微小的缺陷也会导致内部的电场分布发生畸变;XLPE处的导电尖端是电场强度最集中、畸变最严重的部位,样本数据的电场强度最大值高达6.365 MV·m^(-1),若不及时处理将导致绝缘击穿。该计算结果可供工程应用参考,用于指导中间接头的安装和预防绝缘击穿。A 3D model of the joint was built on Ansys Maxwell platform,taking the 10 kV cross linked polyethylene(XLPE)cable intermediate joint as the object.In addition to considering the effects of typical single defects such as air gap,moisture,conductive particles and pin tip on electric field distribution,the model also focused on actual installation process in the field,and several compound defects were applied to the weaker parts and electric field distribution inside the joint was analyzed by finite element.The results showed that when there was a compound defect in the main insulation inside the joint,field strength at the defect varied with its depth,and even a small defect could lead to distortion of internal electric field distribution;conductive tip at XLPE was the most concentrated and the most seriously distorted part of field strength,and the maximum value of the sample data reached 6.365 MV·m^(-1),which would lead to insulation breakdown if not treated in time.The calculation results can provide reference for engineering application to prevent insulation breakdown and guide the installation of cable intermediate joint in the field.

关 键 词：电缆中间接头 电场分布 绝缘劣化 有限元分析 复合缺陷 

分 类 号：TM21[一般工业技术—材料科学与工程]