纳米改性纤维素绝缘纸在直流场中的空间电荷分布特性  

Space Charge Characteristics of Cellulose Insulation Paper with Nano-modified Under DC Field

作　　者：廖瑞金[1] 刘团[1] 杨丽君[1] 吕程[1] 吴伟强[1] 

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400030

出　　处：《高电压技术》2015年第9期3006-3013,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724505-1)~~

摘　　要：为抑制纤维素绝缘纸介质在直流电场下的空间电荷行为,将纳米Al2O3及纳米Zn O颗粒经硅烷偶联剂表面处理后,对绝缘纸实施改性。真空浸油处理后,用电声脉冲法对各纸样在直流电场下的空间电荷密度分布规律进行了测试和分析,并与普通纤维素绝缘纸进行对比,研究了纳米改性对纸样空间电荷行为产生影响的原因。结果表明:和普通绝缘纸相比,纳米改性绝缘纸对空间电荷行为具有明显的抑制作用,空间电荷积聚量变少,电场分布更加均匀,电场畸变率下降;去压后纸样内部残余电荷衰减速率变慢,衰减时间常数τ变大。改性纸的空间电荷行为得到抑制可能和纳米粒子引入了大量深能级陷阱有关。In order to suppress the space charge behavior under DC field of cellulose insulation paper medium, the cel- lulose insulation paper was modified with nano-sized A1203 and nano-sized ZnO after the surface treatment by coupling agent. After vacuum oil impregnation processing, the space charge density distribution of oil-immersed paper samples under DC field was tested and analyzed with pulsed electric-acoustic （PEA） method. Moreover, compared with ordinary cellulose insulation paper, the impact of the nano modification on cellulose paper＇s space charge behavior was studied. The results show that, compared with ordinary insulation paper, the space charge behavior of nano-modified insulation paper is significantly inhibited, the quantitative accumulation of space charge becomes less, and the electric field distribution is more uniform and the electric field distortion rate decreases. As the DC voltage removes, the residual charge in the samples decays at a lower rate, and the decay time constant t becomes larger. Space charge behavior of modification paper may be inhibited because nanoparticles have brought a large amount of deep level traps.

关 键 词：变压器 油浸纸 空间电荷 电声脉冲 纸改性 纳米AL2O3 纳米ZNO 

分 类 号：TM215.6[一般工业技术—材料科学与工程]