SF_(6)/N_(2)气体中环氧/ZnO涂覆对环氧复合材料直流沿面闪络性能的影响机制  

Influence mechanisms of epoxy/ZnO coating on DC surface flashover performance of epoxy composite in SF_(6)/N_(2) gases

作　　者：张磊 张国宝 吴正阳 杨为 蔡梦怡 张龙飞 李枕 ZHANG Lei;ZHANG Guobao;WU Zhengyang;YANG Wei;CAI Mengyi;ZHANG Longfei;LI Zhen(Electric Power Research Institute,State Grid Anhui Electric Power Company Limited,Hefei 230601,China;Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,安徽合肥230601 [2]哈尔滨理工大学工程电介质及其应用教育部重点实验室,黑龙江哈尔滨150080

出　　处：《绝缘材料》2025年第4期99-108,共10页Insulating Materials

基　　金：国家电网超/特高压GIS绝缘可靠性提升专项研究框架项目(5500-202316791A-3-8-KJ);国家自然科学基金青年基金资助项目(52307166)。

摘　　要：盆式绝缘子气-固界面的沿面闪络是引发特高压GIS/GIL故障的关键问题,也是制约先进输变电系统发展的技术瓶颈。为提升SF_(6)/N_(2)混合气体中盆式绝缘子的直流沿面闪络特性,本文在环氧树脂中添加不同含量的氧化锌(ZnO)纳米粒子得到环氧/氧化锌(EP/ZnO)涂层,将EP/ZnO涂层涂覆于环氧材料表面,并对其表面输运参数及沿面闪络性能进行测试。结果表明:EP/ZnO涂层增大了环氧复合材料的浅陷阱密度,并降低浅陷阱能级,使载流子迁移率增加。ZnO质量分数为15%和20%的EP/ZnO涂层涂覆环氧材料的电导率呈现出非线性特征,涂层的存在可减少电场畸变,促进表面电荷的消散。EP/ZnO涂层可显著均匀电场分布并有效抑制环氧材料表面的电荷积聚,且提高了直流闪络性能。当ZnO质量分数为20%时,环氧复合材料的直流闪络电压提升了15.42%。Surface flashover at the gas-solid interface of basin type insulator is the key problem that causes the ultra high voltage GIS/GIL failure,and it is the technical bottlenecks restricting the development of advanced electrical transmission system.In order to improve the DC flashover performance of the basin type insulator in SF_(6)/N_(2) gas mixture,the zinc oxide(ZnO)nanoparticles with different contents were added to the epoxy resin to obtain epoxy/zinc oxide(EP/ZnO)coatings,and the EP/ZnO coatings were coated on the surface of epoxy material.Then the transport parameters and flashover performance were tested.The results show that EP/ZnO coating increase the shallow trap density and reduce the shallow trap energy level of epoxy composite,and increase the carrier mobility.The electrical conductivity of the epoxy materials coated by EP/ZnO coatings with 15%and 20%ZnO mass fraction show nonlinear characteristics,the existence of the coatings can reduce the electric field distortion and promote the dissipation of surface charge.The EP/ZnO coating can remarkably uniform electric field distribution and effectively inhibit the charge accumulation on the surface of epoxy materials,and improve the DC flashover performance.When the mass fraction of ZnO is 20%,the DC flashover voltage of the epoxy composite increases by 15.42%.

关 键 词：沿面闪络 环氧/ZnO涂层 表面陷阱 表面电荷 非线性电导 

分 类 号：TM213[一般工业技术—材料科学与工程]