温度对电缆终端界面应力影响的仿真研究  

Simulation Study on Influence of Temperature on Interface Stress of Cable Terminal

作　　者：邓繁盛 李秀峰[1] 丁志鹏 刘迪 白鑫宇 魏凯 DENG Fansheng;LI Xiufeng;DING Zhipeng;LIU Di;BAI Xinyu;WEI Kai(College of Electric and Electronic Engineering,Shandong University of Technology,Shandong Zibo 255000,China;State Grid Yiyuan Power Supply Company,Shandong Electric Power Corporation,Shandong Zibo 256100,China;Shandong Qixing Electric Technology Development Co.,Ltd.,Shandong Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]国网山东省电力公司沂源县供电公司,山东淄博256100 [3]山东七星电气科技发展有限公司,山东淄博255000

出　　处：《高压电器》2024年第11期101-109,共9页High Voltage Apparatus

基　　金：山东省自然科学基金项目(ZR2022ME187)。

摘　　要：电缆终端硅橡胶(SR)绝缘与电缆本体交联聚乙烯(XLPE)绝缘之间良好的界面压力,是保证电缆终端高效安全运行的关键。电缆终端内径处的径向应力为电缆终端与电力电缆间的界面压力,温度的变化导致界面机械应力、界面热应力以及SR绝缘应力松弛特性存在差异,进而影响电缆终端的界面压力。文中采用单变量法研究温度对于界面机械应力、界面热应力以及SR绝缘应力松弛特性的影响,通过实验测得SR以及XLPE试样的线膨胀系数随温度的变化规律,将其分配到三维模型中,利用SR绝缘的超弹性和粘弹性本构模型,仿真计算不同温度下的界面径向应力。结果表明:界面径向机械应力即初始面压随温度的升高而下降;不同温度下界面热应力大小存在差异,界面压力增幅随之变化,最大增幅约21.87%;SR绝缘的应力松弛速度随温度的升高而加快,电缆终端SR绝缘温度长期处于70℃运行50年后,界面压力下降5.63%左右。The perfect interface pressure between the insulation of cable terminal silicone rubber(SR) and of cable body cross-linked polyethylene(XLPE)is the key to assure efficient and safe operation of cable terminal.The radial stress at the internal diameter of the cable terminal is the interface pressure between the cable terminal and the power cable,and the variation of temperature leads to the difference among the mechanical stress of the interface,the thermal stress of the interface and the stress relaxation characteristics of SR insulation,thus affecting the interface pressure of the cable terminal.In this paper,the influence of temperature on mechanical stress of the interface,the thermal stress of the interface and the stress relaxation characteristics of SR insulation is studied by single variable method,the variation of the linear expansion coefficient of SR and XLPE sample is measured by experiment,distributed to the three-dimensional model,and the interface radial stress at different temperatures is simulated by using the ultraelastic and sticky elasticity structure model of SR insulation.The results show that the radial mechanical stress of the interface,namely the initial surface pressure,decreases with the increase of rise of temperature.The magnitude of the interface stress under different temperatures is different,the interface pressure magnitude varies with it and the maximum increase magnitude is about 21.87%.The stress relaxation speed of SR insulation accelerates with the increase of temperature,and the interface pressure decreases by about 5.63% after 50 years of operation of the cable terminal when the SR insulation temperature is at 70 ℃ for a long time.

关 键 词：电缆终端 界面压力 机械应力 热应力 应力松弛 有限元法 

分 类 号：TM247[一般工业技术—材料科学与工程]