纳米Al_2O_3掺杂对绝缘纸热老化电气特性的影响  

Influence of Nano-Al_2O_3 on Electrical Properties of Insulation Paper under Thermal Aging

作　　者：鄢水强 廖瑞金[1] 吕彦冬[2] 赵学童[1] 何利华[1] Yan Shuiqiang Liao Ruijin Lii Yandong Zhao Xuetong He Lihua(State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology Chongqing University Chongqing 400044 China Alstom Grid Technology Center Co. Ltd Shanghai 201114 China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]阿尔斯通电网技术中心有限公司,上海201114

出　　处：《电工技术学报》2017年第11期225-232,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51437001);国家创新研究群体基金(51321063);中国电力科学研究院科技项目(GY71-14-001)资助

摘　　要：为探究纳米Al_2O_3掺杂对纤维素绝缘纸热老化条件下电气特性的影响,在实验室制备了纳米Al_2O_3掺杂质量分数为2%的复合绝缘纸和普通绝缘纸手抄片,浸油后形成油纸复合绝缘样品,并在130℃老化箱中开展加速热老化试验。试验测试了不同老化阶段纳米复合纸与普通纸的电气参数及油纸老化产物,研究了纳米Al_2O_3掺杂提升绝缘纸电气性能的机理,并分析得到了老化过程对绝缘纸电气性能的影响规律。研究结果表明:掺杂纳米Al_2O_3的复合绝缘纸具有较好的交直流电气特性和抗热老化性能,认为纳米Al_2O_3的"介电双层"结构有效减弱了绝缘纸内界面极化和转向极化,降低了绝缘纸的相对介电常数及介质损耗。纳米Al_2O_3掺杂可以有效降低绝缘纸中载流子迁移率,增大其体积电阻率。Al_2O_3的高热导率及其与纤维素间的连接作用增大了绝缘纸热导率,加速了绝缘纸内热量扩散,提升了绝缘纸抗热老化性能。In order to study the effect of nano-Al2 03 on the electrical properties of insulation paper under thermal aging, composite paper with 2% nano-Al203 and conventional paper were prepared, then the accelerated thermal aging test under 130 Tl with conventional oil-paper and nano-Al203 composite oil-paper were performed. The main electrical parameters of paper and aging products in oil-paper system were tested. The modification mechanisms of nano-Al203 on electrical properties were researched, and the variations in properties of insulation paper during aging process were analyzed. The research results show that nano-Al2 03 improves the electrical properties and anti-aging ability of composite paper. The electric double layer structure of nano-Al203 can weaken the interfacial polarization and dipole polarization, which reduces the permittivity and dielectric loss. It is considered that nano-Al2 03 effectively decreases the carrier mobility and increases the volume resistivity of composite paper. High thermal conductivity of Al2 03 and the connection structure between nano-Al2 03 and cellulose chains may increase the thermal conductivity of insulation paper and accelerate the heat diffusion in composite paper, so that the anti-aging ability of composite paper gets enhanced.

关 键 词：绝缘纸 纳米AL2O3 电气特性 热老化 热导率 

分 类 号：TM215.6[一般工业技术—材料科学与工程]