憎水迁移过程中的波动性

发布时间：2018-06-20 21:06

本文选题：憎水性 + 波动性　；参考：《中国电机工程学报》2014年06期

【摘要】：迁移时间是复合绝缘子人工污秽试验中的重要参数,为了说明迁移时间对于污层憎水性能描述的局限性,本文对染污复合绝缘子的憎水迁移过程进行了研究。通过测量高温硫化硅橡胶(high temperature vulcanizing silicon rubber,HTV)试片污层表面液滴接触角、液滴水平投影面积及HTV芯棒的污闪电压,发现污层憎水性能随迁移时间增长呈波动性增长。污层表面憎水性小分子不断向空气扩散,是导致憎水性呈波动性增长的内因;污层内部水分含量的变化,则是导致憎水性能呈波动性增长的主要原因;当试品所处迁移环境空气流通性较好时,有利于促进试品污层干燥,减小憎水性随迁移时间增长过程中的波动性。研究认为:染污复合绝缘子污层表面憎水性能随迁移时间总体上是增长的,但是,憎水性波动过程的存在,以及迁移过程受迁移环境的影响显著,使得单一的迁移时间不是描述污层憎水性能的理想参数。要提高复合绝缘子人工污秽试验与自然污秽试验间的等价性,需要寻找更合适的参数来描述试品污层的憎水性状态。
[Abstract]:The migration time is an important parameter in the artificial contamination test of composite insulators. In order to illustrate the limitation of the migration time for the description of the hydrophobicity of the contaminated layer, the hydrophobic migration process of the contaminated composite insulators is studied. The contamination layer table of the high temperature vulcanizing silicon rubber (HTV) test sheet is measured by the measurement of the hydrophobicity of the contaminated composite insulators. It is found that the hydrophobicity of the fouling layer increases with the migration time. The hydrophobicity of the fouling layer is spreading to the air, which is the internal cause of the fluctuating growth of the hydrophobicity, and the change of the water content in the fouling layer leads to the performance of the hydrophobicity. The main reason for dynamic growth is that when the test product has better air circulation in the migration environment, it is beneficial to promote the drying of the contamination layer of the test products and reduce the fluctuation of the hydrophobicity in the process of the migration time. The existence and migration process are greatly influenced by the migration environment, which makes the single migration time not an ideal parameter to describe the hydrophobicity of the fouling layer. To improve the equivalence between the artificial contamination test and the natural pollution test, a more suitable parameter is needed to describe the hydrophobicity of the test contamination layer.
【作者单位】：清华大学深圳研究生院;
【基金】：国家重点基础研究发展计划项目(973项目)(2009CB724503)~~
【分类号】：TM216

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