各向异性导热绝缘材料直流沿面闪络特性研究  

Study on the DC Surface Flashover Performances of Composites With Anisotropic Thermal Conductivity

作　　者：张樱凡 黄正勇[1] 王浩欢 李剑[1] ZHANG Yingfan;HUANG Zhengyong;WANG Haohuan;LI Jian(State Key Laboratory of Power Transmission Equipment Technology(Chongqing University),Shapingba District,Chongqing 400044,China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2024年第21期8683-8692,I0030,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(51707016);芜湖市科学基金项目(2022hg15)。

摘　　要：电力设备逐渐向高功率化、小型化发展,设备发热愈发严重,局部高温不但会大大缩短介质的寿命,而且更易诱发直流沿面闪络。针对以上问题,该文采用片状Al_(2)O_(3)取向复合材料,通过合理设计电极位置使热量在电极间传导较慢,而在垂直电极方向传导较快,实现在输电导体发热时既能有效抑制直流沿面闪络,同时又能高效散热。针对输电导体发热时环氧树脂直流沿面闪络电压降低的问题,研究Al_(2)O_(3)取向复合树脂导热各向异性对其温度分布的影响,分析温度分布对Al_(2)O_(3)取向复合树脂表面电场分布的影响,研究定向导热Al_(2)O_(3)取向复合树脂在不同温度下的直流沿面闪络特性。研究表明,片状Al_(2)O_(3)取向方向与沿面闪络路径垂直时可抑制导体热量向地电极传输,从而减少阳极三结点处电场畸变,进而抑制直流沿面闪络。With power equipment gradually developing towards high-power and miniaturization,equipment heating is becoming increasingly severe,which will not only greatly shorten the life of the medium,but also more likely to induce DC flashover.In order to solve the above problems,a composite with oriented Al2O3 sheets is used to reasonably design the electrode position to make the heat dissipation between the electrodes slower and faster in the vertical electrode direction,so as to effectively suppress the DC surface flashover and efficiently heat dissipation.For the surface flashover of epoxy resin at HV electrode heating,the influence of the thermal conductivity of the Al_(2)O_(3)-oriented composite on its temperature distribution is studied,and the influence of temperature distribution on the surface electric field distribution of the Al_(2)O_(3)-oriented composite is analyzed.The research shows that when the orientation direction of the Al_(2)O_(3)sheets is perpendicular to the surface flashover path,the conductor heat transfer to the ground electrode can be inhibited,thereby reducing the electric field distortion at the three nodes of the anode and inhibiting the DC flashover along the surface.

关 键 词：Al_(2)O_(3)取向 各向异性导热 直流沿面放电 电场畸变 

分 类 号：TM216[一般工业技术—材料科学与工程]