电工技术学报  2016, Vol. 31 Issue (12): 40-48    DOI:
高电压与绝缘 |
纳米SiO2/芳纶绝缘纸复合材料的空间电荷特性和介电性能
廖瑞金1, 柳海滨1, 柏舸1, 郝建2, 李萧1, 林元棣1
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. 国网重庆市电力公司电力科学研究院 重庆 401123
Space Charge Characteristics and Dielectric Properties of Nano-SiO2/Aramid Paper Composite
Liao Ruijin1, Liu Haibin1, Bai Ge1, Hao Jian2, Li Xiao1, Lin Yuandi1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. State Grid Chongqing Electric Power Company Electric Power Research Institute Chongqing 401123 China
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摘要 为提高油纸绝缘系统的绝缘寿命,提出将纳米SiO2粒子改性的芳纶绝缘纸应用于直流输变电设备的方法。在加压和去压短路条件下,测试了不同纳米SiO2含量的芳纶绝缘纸试样的空间电荷特性、热刺激去极化电流、直流击穿强度和体积电阻率。结果表明:添加纳米SiO2使芳纶绝缘纸的线均电荷密度明显低于纯芳纶纸试样;随纳米SiO2含量的增加,试样平均电荷密度衰减速率呈现先减小后增大的变化趋势;SiO2的添加增加了芳纶纸内部深陷阱和浅陷阱的密度;纳米SiO2含量为1wt%时直流击穿强度最大;芳纶纸的体积电阻率随纳米SiO2含量增加呈单调递增趋势。机理分析表明纳米SiO2粒子浓度过高时,其分散性变差导致其对芳纶纸性能的改善作用变弱。
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关键词 芳纶绝缘纸二氧化硅纳米改性空间电荷热刺激电流击穿强度体积电阻率    
Abstract:In order to apply aramid paper in the DC power transmission equipment to increase the life expectancy, the method of nano-SiO2 particle modified aramid insulation paper is proposed to improve the space charge properties and DC dielectric properties. The aramid insulation paper samples with different nano-SiO2 contents wad presented. The space charge characteristics, the thermally stimulated depolarization current (TSDC), DC breakdown voltage and volume resistivity of aramid papers with different SiO2 contents were measured respectively under increasing voltage and short circuit conditions. The results show that nano-SiO2 could efficiently prevent the space charge injection. The medium charge density of nano-modified aramid paper samples is smaller than that of the pure aramid paper sample during the voltage-on process. With the increasing percentage of nano-SiO2, the decay rate decreases at the first and then increases. The result of TSDC indicates that nano-SiO2 increases the density of deep trap and shallow trap simultaneously. The DC breakdown strength of the sample with 1%wt nano-SiO2 is the maximum. The volume resistivity of aramid papers increases with the increasing of nano-SiO2 content. When the concentration of nano-particle is too high, the improvement of aramid paper performance is weakened as a result of poor dispersion.
Key wordsAramid paper    silicon dioxide    nano-modification    space charge    thermally stimulated current    breakdown strength    volume resistivity   
收稿日期: 2014-12-26      出版日期: 2016-07-12
PACS: TM215.4  
基金资助:国家重点基础研究发展计划(973计划)资助项目(2009CB724505-1)
作者简介: 作者简介廖瑞金 男,1963年生,教授,博士生导师,研究方向为电气设备绝缘在线监测与故障诊断和高电压测试技术。E-mail: rjliao@cqu.edu.cn柳海滨 男,1990年生,硕士研究生,研究方向为输变电设备绝缘在线监测与故障诊断和新型绝缘材料。E-mail: lhbcqu@cqu.edu.cn
引用本文:   
廖瑞金, 柳海滨, 柏, 舸, 郝, 建, 李, 萧, 林元棣. 纳米SiO2/芳纶绝缘纸复合材料的空间电荷特性和介电性能[J]. 电工技术学报, 2016, 31(12): 40-48. Liao Ruijin, Liu Haibin, Bai Ge, Hao Jian, Li Xiao, Lin Yuandi. Space Charge Characteristics and Dielectric Properties of Nano-SiO2/Aramid Paper Composite. Transactions of China Electrotechnical Society, 2016, 31(12): 40-48.
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