An experimental investigation on the degradation characteristic of the outdoor silicone rubber insulator due to sulfate and nitrate ions

IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI:10.1109/CEIDP.1997.641088

J. Koo, I. Kim, J.T. Kim, W. Park

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引用次数: 20

Abstract

Since 1960, polymer insulator has been employed as an outdoor insulator for high voltage ascribed to its excellent aging characteristics compared to those of ceramic insulator. However, in spite of various investigations related to the polymer insulator, its aging mechanism due to acid rain have not been well elucidated. In this paper, aging characteristics of outdoor silicone rubber insulator resulting from the acid rain have been investigated with regards to sulfuric and nitric solutions. For this purpose, silicone rubber was aged by being immersed in the sulfuric and nitric solutions with different level of pH (5.6, 4.0, 2.5, 1.5) during 1500 hours and various tests were performed such as tracking, contact angle, tan/spl delta/, breakdown voltage, SEM, EDS, FT-IR. Regarding the effect of the acidity of nitric solution, the surface of test samples were slightly damaged up to pH 2.5 and ruined at pH 1.5. However, in case of sulfuric solution, the degree of the surface degradation was observed to be consistently increased. And thus, for the former, it could be expected that there is certain critical value between pH 1.5 and pH 2.5, which likely could induce serious surface degradation For both cases, it was observed that the hydrophobicity and tracking resistance of the silicone rubber insulator are well retained regardless of the acidity of the solution.

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硫酸盐和硝酸盐离子对室外硅橡胶绝缘子降解特性的实验研究

与陶瓷绝缘子相比，聚合物绝缘子具有优良的老化特性，自1960年以来，聚合物绝缘子一直被用作室外高压绝缘子。然而，尽管对聚合物绝缘体进行了各种研究，但其酸雨老化机理尚未得到很好的阐明。本文研究了室外硅橡胶绝缘子在硫酸和硝酸溶液中酸雨作用下的老化特性。为此，将硅橡胶在不同pH值(5.6、4.0、2.5、1.5)的硫酸和硝酸溶液中浸泡1500小时，进行跟踪、接触角、tan/spl delta/、击穿电压、SEM、EDS、FT-IR等测试。在硝酸溶液酸度的影响下，试样的表面在pH为2.5时略有损伤，在pH为1.5时破坏。然而，在硫酸溶液中，观察到表面降解的程度持续增加。因此，对于前者，可以预期在pH 1.5和pH 2.5之间存在一定的临界值，这可能会导致严重的表面降解。在这两种情况下，观察到无论溶液的酸度如何，硅橡胶绝缘子的疏水性和跟踪电阻都得到了很好的保留。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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