表面电荷对聚四氟乙烯沿面击穿特性的影响

铁氟龙

表面电荷对聚四氟乙烯沿面击穿特性的影响   

Effect of space charge on surface-breakdown behavior of polytetrafluoroethylene

作　　者：王飞鹏[1] 张涛[1] 文刚[1] 范帆[1] 李剑[1] 崔万照[2]
WANG Feipeng;ZHANG Tao;WEN Gang;FAN Fan;LI Jian;CUI Wanzhao;State Key Laboratory of Power Transmission Equipment &System Security and New Technology,Chongqing University;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology (Xi′an);

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,重庆400044 [2]中国空间技术研究院西安分院空间微波技术重点实验室,西安710100


出　　处：《中国空间科学技术》2017年第3期28-34,共7页
Chinese Space Science and Technology

基　　金：国家自然科学基金重点项目（U1537211）; 国家重点基础研究发展计划（973）（2015CB251003）; 中央高校科研业务费项目（106112015CDJXY150006）

摘　　要：聚四氟乙烯（Polytetrafluorethylene,PTFE）因其高绝缘性而极易在表面积累空间电荷,且电荷衰减周期长。认识表面电荷对PTFE沿面击穿性能的影响,对设计相关的绝缘系统具有重要指导意义。使用针-板电极装置,采用从6kV变化到10kV的正、负极性针电压对PTFE样品膜进行电晕充电积累表面电荷,使用静电电位计测量样品膜表面电位并估算得到表面电荷面密度。对具有不同表面电荷密度的PTFE样品膜,试验研究常压及真空中样品的负极性直流沿面击穿场强。结果表明,不同充电电压可以有效调控PTFE表面电荷密度。负极性较正极性电晕充电能够更有效地在PTFE表面积累高密度电荷;正极性表面电荷在常压和真空中均导致PTFE的负极性直流沿面击穿场强降低,而负极性表面电荷则具有影响程度较小的相反效果,即仅在一定程度上提高PTFE的负极性直流沿面击穿场强,且表面电荷在真空中对沿面击穿场强的影响弱于常压环境。
Owing to the low conductivity,polytetrafluoroethylene(PTFE)tends to accumulate surface charge which is caused by various factors,e.g.friction,space charge carriers,cosmic rays,etc.Additionally,the decay of surface charge takes long time.It is certainlysignificative to investigate the role of surface charge on influencing the surface-breakdown behavior.This work endows PTFE sample films with variable surface-charge density by needle-plate corona-charging electrodes.Negative DC surface breakdown voltage was then measured on all samples at atmospheric pressure and in vacuum.Experimental results show that the surface charge density is tailorable by needle voltages;however,the negative corona accumulates surface charge faster than the positive corona.The positive surface charge benefits to reduce negative DC surface breakdown voltage, while negative surface charge slightly leads to an opposite way,i.e.enhancing the surface breakdown voltage for a certain extent.Additionally,the influence of space charge on the breakdown voltage in vacuum is weaker than that at atmospheric pressure.

关 键 词：表面电荷 聚四氟乙烯 常压 真空 沿面击穿

分 类 号：TM201.44[电气工程—电工理论与新技术;一般工业技术—材料科学与工程]