Development of Nanostructured Inorganic Oxide Coatings for Outdoor Insulators used in Power System
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Date
2018-10-29
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MPUAT, Udaipur
Abstract
High voltage insulators play a very important role in the transmission of power from generation to the consumer end, and in protecting the supporting towers from the high voltage lines as well as it also prevents the flashover due to the sudden rise of voltage and due to other causal factors. Being installed in outside environment they are facing a problem of accumulation of air borne contamination on their surface. As the range of transmission voltage increases, the pollution severity of the site becomes the most important factor in determining the insulation level of the system. The main sources of contamination are coastal areas, salt industries, cement industries, volcanic activity areas, industrial burning and chemical industries. These pollutions get moistened during a light rain or fog or mist, due to which conducting layer is formed and thus, leakage current flows through this conducting layer. These are under high voltage stress due to which warming-up of the insulation surface layer takes place and results in dry bands. Partial arc appear throughout the dry bands which ultimately lead to surface flashover of the insulator. Flashover on polluted insulators poses a serious threat to the reliability of the system and leads to system outages. There are many remedial measures to minimize the flashover of a porcelain insulator under pollution conditions. One such method is the washing of insulators periodically but this method is labor intensive, other application of hydrophobic coatings such as Room Temperature Vulcanizing Silicone Rubber (RTV-SiR), grease/oil/petroleum jellies, etc coatings on the surface of ceramic insulators. These methods are having its pros and cons. A recently proposed solution for contaminated outdoor insulators consists of the application of the nanocoating (thin films) onto the surface of the insulator. The main objective of present work was to synthesize nanostructured dielectric hydrophobic thin films especially, zirconium oxide (ZrO2), and zirconium – titanium oxide (ZrTiO) on glass substrates by DC magnetron sputtering technique and to investigate the effect of sputtering process parameters on structural, optical, hydrophobic and electrical properties of these materials in order to mitigate the problem of contamination. It was found that the maximum hydrophobicity (1120) was obtained for nanocomposite ZrTiO coating with high dielectric constant, resistivity, refractive index and breakdown strength when compared to ZrO2 film. From cost point of
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view also zirconium and titanium are very cheap hence, nanocomposite ZrTiO coating can be submitted as a best coating for glass insulators to mitigate contamination problem
Description
Development of Nanostructured Inorganic Oxide Coatings for Outdoor Insulators used in Power System
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Citation
Kumar, S. and Dave , V.