Effects of Low Temperature and Nanoparticles on Electrical Trees in RTV Silicone Rubber
Effects of Low Temperature and Nanoparticles on Electrical Trees in RTV Silicone Rubber
复制标题
低温和纳米颗粒对 RTV 硅橡胶电树的影响
DOI：
10.1109/tdei.2014.004341
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发表时间：
2014-08-01
影响因子：
3.1
通讯作者：
Han, T.
中科院分区：
文献类型：
--
作者：
Du, B. X.;Su, J. G.;Han, T.
电力电缆系统的工作温度对室温硫化（RTV）硅橡胶的电气性能影响很大。研究了低温和纳米颗粒对RTV硅橡胶电树的影响。将SiO2纳米颗粒掺入RTV硅橡胶中制备样品，其含量分别为0、0.5、1、1.5和2 wt%。实验温度范围为-30 ~ -90℃，针板电极之间施加频率为50 Hz的交流电压。对电树形态、生长速率、膨胀系数、分形维数和累积损伤比例进行了研究。结果表明，纳米颗粒和低温环境对电树生长均有显著影响。当温度高于-60℃时，树型为分枝树或灌木树；而温度低于-90℃时只有松树，与30℃相比，有些树槽在-60℃的硅橡胶中更容易繁殖。温度对电树的膨胀系数也有影响。随着纳米颗粒含量的增加，电树的分形维数增加，而树面积的累积损伤呈相反的趋势。
The operating temperature of power cable system has a great influence on the electrical performance of room temperature vulcanizing (RTV) silicone rubber. This paper investigated the effects of low temperature and nanoparticles on electrical tree in RTV silicone rubber. Samples were prepared by mixing SiO2 nanoparticles into RTV silicone rubber, with the content of 0, 0.5, 1, 1.5 and 2 wt% respectively. The experiment temperature was ranged from -30 to -90 degrees C. AC voltage with a frequency of 50 Hz was applied between a needle-plate electrode. The electrical tree patterns, growth rate, expansion coefficient, fractal dimension and proportion of accumulated damage were studied. The results reveal that both nanoparticles and low temperature environment have a significant impact on the electrical tree growth. The tree patterns are branch tree or bush tree when the temperature is higher than -60 degrees C; however, there is only pine tree when the temperature is lower than -90 degrees C. Compared with 30 degrees C, some tree channels are easier to propagate at -60 degrees C in silicone rubber. It is also suggested that the temperature affects the expansion coefficient of electrical tree. The fractal dimension of the electrical tree increases with the nanoparticle content, while the accumulated damage of treeing area shows the opposite tendency.