缺陷对电缆中间接头温度分布影响的仿真研究  

Simulation Study on Effect of Defects on Temperature Distribution of Cable Intermediate Joint

作　　者：古亮[1] 赵阿琴 郝鸿凯 刘肖光 GU Liang;ZHAO Aqin;HAO Hongkai;LIU Xiaoguang(Chongqing University of Technology, Chongqing 400054, China)

机构地区：[1]重庆理工大学,重庆400054

出　　处：《绝缘材料》2019年第5期69-74,共6页Insulating Materials

基　　金：国家自然科学基金青年科学基金项目(51107155);重庆市教委科学研究项目(KJ1400914)

摘　　要：电缆中间接头在制造或者安装的过程中易产生缺陷,导致局部温度上升而加速绝缘老化,对电力系统的稳定运行造成威胁。但实际中无法直接测量电缆接头内部的温度,因此有必要对电缆接头的内部温度分布进行仿真研究。利用ANSYS软件建立了电缆中间接头以及其内部存在缺陷的二维、三维物理模型,并对其进行温度场仿真分析。结果表明:当电缆中间接头不存在缺陷时,其温度沿径向自内向外逐渐降低,轴向温度自中心位置向两边逐渐降低;当电缆中间接头中的交联聚乙烯/硅橡胶界面存在气隙、水汽、导电颗粒时,接头内部局部温度受缺陷处材料热导率的影响;气隙的尺寸越大,对局部温度的影响越大,局部升温范围是气隙本身尺寸的5倍;气隙位置越靠近接头两侧,局部升温越高。It is easy to produce defects in the manufacture or installation process of cable intermediate joints, which would lead to local temperature rise and insulation accelerate ageing, so it is a threat to the stable operation of electric power. However, the internal temperature of cable joint cannot be measured directly in practice, so it is necessary to simulate the internal temperature distribution of cable joint. A 2D and 3D physical model of cable intermediate joint with internal defects were established using ANSYS software, and their temperature field was simulated and analyzed. The results show that when there is no defect in the cable joint, the temperature decreases gradually from inside to outside along the radial direction, and the axial temperature decreases gradually from the central position to the two sides. When there are air gap, water moisture, and conductive particles in XLPE/SIR interface of cable joint, the local temperature of joint is affected by the thermal conductivity of material at the defect. The larger the size of air gap, the greater the effect on the local temperature, and the local temperature rise range is 5 times the size of the air gap itself. The closer the gap position to the two sides of joint, the more serious the local temperature rise.

关 键 词：电缆中间接头 缺陷 温度仿真 气隙 

分 类 号：TM855[电气工程—高电压与绝缘技术]