复合绝缘子粉化伞裙的微观结构与憎水性的关联研究

发布时间：2018-05-10 19:44

本文选题：复合绝缘子 + 粉化　；参考：《电网技术》2016年01期

【摘要】：为研究粉化硅橡胶伞裙的憎水性与其微观结构的关系,针对现场取回的3支粉化的110kV复合绝缘子,通过红外光谱、扫描电镜、能谱分析等方法开展研究。首先,利用静态接触角和喷水分级法测试样本的憎水性,粉化层表面的憎水性相比新样本略有下降,去掉表面的粉化层后,其憎水性明显下降。然后,通过红外光谱测试发现样本的主链和侧链基团(Si-O和Si-CH_3)发生了断裂,侧链甲基含量减少;扫描电镜发现去粉化层后硅橡胶表面存在大量微孔和裂纹,因而导致去粉化层后的硅橡胶伞裙表面憎水性明显降低。最后,通过能谱分析发现,粉化层中的硅含量明显高于去粉化层后硅橡胶表面和材料内部值,同时粉化层表面的粗糙度增加,说明粗糙度和硅氧烷小分子的迁移同时导致粉化层表面的憎水性优于去掉粉化层后的表面。研究结果表明,粉化与硅橡胶伞裙的憎水性关联密切,但仍需深入研究粉化复合绝缘子的运行可靠性和使用寿命。
[Abstract]:In order to study the relationship between the hydrophobicity of powdered silicone rubber umbrella skirt and its microstructure, three powdered 110kV composite insulators obtained from the field were studied by means of infrared spectroscopy, scanning electron microscope and energy dispersive spectrum analysis. Firstly, the hydrophobicity of the sample was measured by static contact angle and water spraying classification method. The hydrophobicity of the powder layer was slightly lower than that of the new sample, and the hydrophobicity of the pulverized layer decreased obviously after the removal of the powder layer. Then, the main chain and side chain group Si-O and Si-CH3 of the sample were found to be broken, and the side chain methyl content was decreased by infrared spectroscopy. Scanning electron microscope showed that there were a lot of micropores and cracks on the surface of silicone rubber after the demineralization layer was removed. As a result, the surface hydrophobicity of silicone rubber umbrella skirt is obviously reduced. Finally, the results of energy spectrum analysis show that the silicon content in the powdered layer is significantly higher than that in the demineralized layer, and the surface roughness of the powdered layer is increased. The results show that the surface hydrophobicity of the powder layer is better than that of the powder layer after removal of the powder layer due to the roughness and the migration of siloxane small molecules. The results show that the powdering is closely related to the hydrophobicity of the silicone rubber umbrella skirt, but the reliability and service life of the powdered composite insulator still need to be deeply studied.
【作者单位】：中国电力科学研究院;四川大学电气信息学院;
【分类号】：TM216

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