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作 者:刘时珍 陈少杰 李欢 邓显波 LIU Shizhen;CHEN Shaojie;LI Huan;DENG Xianbo(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;China Electric Power Research Institute,Wuhan 430074,China)
机构地区:[1]陕西理工大学电气工程学院,陕西汉中723001 [2]中国电力科学研究院有限公司,湖北武汉430074
出 处:《绝缘材料》2025年第4期134-144,共11页Insulating Materials
基 金:陕西省科技厅自然科学重点项目(2023-JC-ZD-34);陕西省教育厅专项基金资助项目(22JK0322);陕西理工大学研究生创新基金资助项目(SLGYCX2403)。
摘 要:电缆接头是电缆线路中最薄弱的环节,而铝合金导体电缆接头处导体与连接管之间的接触电阻是影响电缆接头温度分布及故障率的关键因素。为了研究不同压接工艺对电缆接头温度分布特性的影响,本文以35 kV铝合金电缆导体为研究对象,通过接触电阻测量回路对不同压接百分比导体试样与连接管之间的接触电阻进行测量,得出坑压和围压两种压接工艺下接触电阻与压接百分比之间的定量关系。通过COMSOL有限元仿真软件建立导体横截面积为400 mm^(2)的电缆接头的电-热耦合模型,研究不同压接工艺下接触电阻与电缆接头温度分布特性的对应关系。结果表明:发现接触电阻随压接百分比的增大而增大,在保证电缆长期运行最高温度不超过90℃以及满足力学性能要求的前提下,坑压工艺下压接百分比应控制在27.86%~35.44%,围压工艺下压接百分比应控制在16.01%~22.21%。两种压接工艺的温升曲线变化趋势一致,缆芯部分最高温度出现在连接管位置,并沿轴向逐渐递减;接头外表面温度整体呈现下降趋势,但在连接管部分由于有接触电阻的存在,该部位温度出现了小范围的升高。The cable joint is the weakest link in the cable line,and the contact resistance between the conductor and the connecting pipe at the aluminum alloy conductor cable joint is the key factor affecting the temperature distribution and failure rate of the cable joint.In order to study the influence of different crimping processes on the temperature distribution characteristics of cable joints,a 35 kV aluminum alloy conductor was used as the research object,and the contact resistance between conductor samples with different crimping percentages and connecting tubes were measured through the contact resistance measurement circuit.The quantitative relationshipes between contact resistance and crimping percentage under two crimping processes of pit pressure and confining pressure were obtained.The electro-thermal coupling model of a cable joint with conductor cross-sectional area of 400 mm^(2) was established by COMSOL finite element simulation software,and the corresponding relationship between contact resistance and temperature distribution characteristics of cable joint under different crimping processes was studied.The results show that the contact resistance increases with the increase of the crimping percentage.Under the premise of ensuring that the maximum temperature of the long-term operation of the cable does not exceed 90℃and meeting the mechanical performance requirements,the crimping percentage under the pit pressing process should be controlled at 27.86%-35.44%,and the crimping percentage under the confining pressure process should be controlled at 16.01%-22.21%.The temperature rise curves of the two crimping processes have the same change trend.The highest temperature of the cable core appears at the position of the connecting pipe,and gradually decreases along the axial direction.The temperature of the outer surface of the joint shows a downward trend as a whole,but the temperature of the connecting pipe increases in a small range due to the existence of contact resistance.
关 键 词:铝合金导体 电缆接头 压接工艺 接触电阻 有限元仿真
分 类 号:TM726[电气工程—电力系统及自动化]
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