English
Authors: GEORGE Jean-Marie, LE DU Antoine, LEPLEY Damien, PRAT Sandrine, VIRLOGEUX Fabien.
Title: Silicone coating of insulators: latest technical knowledge based on field performance and laboratory testing.
Presented at: 2022 INMR World Congress, Oct 16 – 19 2022, Berlin, Germany.
Astract
Following the rapid and successful expansion of RTV coated insulators in the overhead line market IEC has started working on a standard following the publication of a very extensive CIGRE brochure TB837.
Sediver has largely contributed and probably introduced to the market more than 20 years ago the concept of “factory coated insulators” in partnership with TERNA, the Italian TSO. Likewise, Sediver launched the concept of an undercoated insulator around 2010 with extensive test results in various pollution conditions. This approach to substitute polymer insulators with hydrophobic surface over glass (but also porcelain) has substantially impacted the selection of insulators in polluted environments in which so far polymer insulators were used for their performance in contaminated environment.
Today many companies offer silicone coated insulators either glass or porcelain and coating is either being applied in factories or on site. The latter case can be divided in two different approaches either directly on the tower or in the direct vicinity of the line or in temporary “sheds” or “specialized containers” trying to duplicate the quality and consistency of factory-made products.
Some performances are still being debated among which adherence which will be discussed in this paper.
More interest also for HVDC applications. In fact, except for China which has already used extensively coated insulators next to polymers in DC there are very few DC lines in severely polluted environments around the world. This will be discussed as well in this contribution.
Finally, a relatively unique field experience will be discussed bringing some light to the far limits of performance of coated insulators in extreme conditions, far beyond the pollution classification from IEC TS60815.
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