Abstract
The performance of insulators when exposed to pollution is a very critical issue which highly affects the external insulation design of the power transmission lines and stations. This paper deals with investigation of the operating conditions of porcelain and glass insulators under artificially contaminated cases. The level of contamination on the surface of the insulator is represented by Equivalent Salt Deposit Density (ESDD). In the laboratory, three types of salts with different combinations were used for studying the correlation between the flashover voltage (FOV) and ESDD of the suspension insulators which are polluted. The results indicate that as far as the insulators are dry, pollution alone will not cause a significant problem. It is found that dry and wet flashover voltage of standard glass insulator is 4.14% to 13.95% and 4.22% to 16.54% respectively, reduced as compared to standard porcelain insulator under the contamination of salt (NaCl+CaO).
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