纳米SiO<sub>2</sub>/芳纶绝缘纸复合材料的空间电荷特性和介电性能

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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 words： Aramid paper silicon dioxide nano-modification space charge thermally stimulated current breakdown strength volume resistivity

Received: 26 December 2014 Published: 12 July 2016

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TM215.4

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