冷热循环对环氧树脂电气性能的影响  

Effect of thermal-cooling cycling on electrical properties of epoxy resin

作　　者：周远翔 徐景凡[1] 朱小倩 刘轩昊 卢毅 高岩峰 ZHOU Yuanxiang;XU Jingfan;ZHU Xiaoqian;LIU Xuanhao;LU Yi;GAO Yanfeng(The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment,School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Research Institute of State Grid Jibei Electric Power Co.,Ltd.,Beijing 100045,China)

机构地区：[1]新疆大学电气工程学院电力系统及发电设备控制和仿真国家重点实验室风光储分室,新疆乌鲁木齐830047 [2]清华大学电机工程与应用电子技术系电力系统及大型发电设备安全控制和仿真国家重点实验室,北京100084 [3]国网冀北电力有限公司电力科学研究院,北京100045

出　　处：《绝缘材料》2025年第2期92-101,共10页Insulating Materials

基　　金：国家电网有限公司科技项目(5500-202214108A-1-1-ZN)。

摘　　要：本文采用线性升降温的方式,探究冷热循环次数和变温速率对环氧树脂电气性能的影响机制。结果表明:随着循环次数的增加,环氧树脂的直流电气强度和体积电阻率均呈先上升后下降的趋势,且这种趋势随着变温速率的增大在循环前期上升幅度较小,而在循环后期下降幅度较为显著。分析认为,冷热交替环境会促进环氧树脂内部链段动态调整,使其结构更致密规整。尽管在循环前期,热胀冷缩作用会使环氧树脂表面出现少量微裂纹,但链段动态调整占主导作用,此时环氧树脂电气性能得到提升,而随着循环次数增加,长期热胀冷缩作用加剧了分子链段的断裂,微裂纹扩展,使环氧树脂电气性能逐渐下降。随着变温速率的增大,环氧树脂内部链段无法充分调整,且所受温度应力冲击增大,环氧树脂更容易发生劣化。The influence mechanism of thermal-cooling cycling times and temperature change rate on the electrical properties of epoxy resin were studied using a linear rising and cooling method.The results show that as the cycle times increases,the DC electric strength and volume resistivity of epoxy resin increase at first and then decrease,and this trend slightly increases in early cycles with the increase of temperature change rate,but decreases significantly in later cycles.The analysis indicates that thermal and cold alternating environment will promote the dynamic adjustment of chain segments in epoxy resin,making its structure more compact and regular.Although thermal expansion and cold contraction may cause micro-cracks appear on the surface of epoxy resin during early cycles,dynamic adjustment plays a dominant role,which leads to the improvment of electrical properties of epoxy resin.However,with the increase of cycle times,long-term thermal expansion and cold contraction intensifies the fracture of molecular chain segments and the expansion of micro-crack,resulting in the decrease of electrical properties of epoxy resin.With the increase of temperature change rates,the internal chain segment in epoxy resin cannot be fully adjusted,and the impact of temperature stress increases,which lead the epoxy resin more prone to deterioration.

关 键 词：冷热循环 环氧树脂 线性升降温 变温速率 电气性能 

分 类 号：TM215[一般工业技术—材料科学与工程]