表层氟化环氧树脂的直流闪络特性  

DC Flashover Characteristics of Surface Fluorinated Epoxy

作　　者：王飞鹏[1] 张涛[1] 李剑[1] 何理 黄正勇[1] 王开正 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室

出　　处：《高电压技术》2018年第2期372-379,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2015CB251003);国家自然科学基金重点项目(U1537211)~~

摘　　要：绝缘电介质表面电荷积累和分布对其沿面放电和击穿行为具有重要影响。通过表层氟化调控环氧树脂表面微观形貌和表面电位衰减速率,研究电极间隙、升压速率和电场均匀程度对环氧树脂负极性直流闪络特性的影响。结果表明：氟化导致环氧树脂表面电位衰减速率加快和表面粗糙度明显增加。经较长时间氟化的环氧树脂样品,其表面粗糙度上升趋至饱和且其在准均匀电场和极不均匀电场中的沿面闪络场强均有所增加。氟化修饰对极不均匀电场下的闪络场强提升效果更为明显：电极间隙10 mm时氟化15、30和60 min使环氧树脂在极不均匀电场中的闪络场强分别增加16%、34%和47%,而在准均匀电场中的闪络场强增加幅度仅分别为9%、15%和22%。表层氟化可抑制环氧树脂表面电荷积累,阻碍放电通道形成,从而提高闪络场强。The accumulation and distribution of surface charge have significant influences on the surface flashover and breakdown behaviors of insulation dielectrics. Surface fluorination was carried out on epoxy resin to regulate the surface morphology and the rate of surface-potential decay. The influences of electrode gap, voltage-rise rate, and electric-field distribution on negative DC flashover characteristics of epoxy resin were investigated. The results show that fluorination will accelerate surface-potential decay and increase the surface roughness. For longer fluorination duration, the surface roughness of epoxy resin increases to attain a saturation value, and the flashover strength under either uniform or highly non-uniform electric field is improved. The fluorination on epoxy resin has led to more significantly improved flashover strength under highly non-uniform electric field. For electrode-gap distance of 10 mm, the fluorination duration of 15, 30 and 60 min ensures the flashover strength of epoxy resin to increase by 16%, 34% and 47%, respectively. In contrast, the corresponding values under highly non-uniform electric field are 9%, 15% and 22%, respectively. The surface fluorination on epoxy resin inhibits the surface-charge accumulation and hinders the discharging-channel development which benefited to the improved flashover strength.

关 键 词：环氧树脂 氟化修饰 电极间隙 升压速率 电场分布 直流闪络 

分 类 号：TM215.1[一般工业技术—材料科学与工程]