为分析±660 kV银东线绝缘子的自然积污规律，在山东德州设置污秽测量点，进行为期一年的自然积污试验。测量了绝缘子的等值盐密（ESDD）和等值灰密（NSDD），对比研究了瓷绝缘子和复合绝缘子表面污秽不均匀度、绝缘子串不同位置积污规律及灰盐比。结果表明：瓷钟罩绝缘子表面污秽不均匀度远高于复合绝缘子；绝缘子串高压端和接地端均比中间部分积污严重；复合绝缘子的伞裙直径越小，积污越严重；瓷绝缘子、复合绝缘子的灰盐比均值分别为12.44、5.86，下表面的灰盐比均大于上表面的灰盐比。
In order to study the natural contamination characteristics of ± 660 kV Yin-Dong transmission line insulators, we had been conducted contamination accumulation experiments on insulators for one year in Dezhou, Shandong Province. The equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD) were measured, and the surface contamination unevenness, the surface contamination deposit law at different positions of insulators, and dust to salt ratio between porcelain insulators and composite insulators were analyzed. The results show that the surface contamination unevenness of porcelain insulators is much higher than that of the composite insulators. The contamination of the high voltage side and earth side is more serious than that of the middle position. The smaller the diameter of composite insulator shed is, the more serious the contamination is. The average of dust to salt ratio of porcelain insulators and composite insulators is 12.44 and 5.86 respectively, and the average of dust to salt ratio of the bottom surface is higher than that of the top surface.
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