Silicone & Other Materials

Chemistry & Properties of Silicones

June 2, 2018 • ARTICLE ARCHIVE, Silicone & Other MaterialsComments Off on Chemistry & Properties of Silicones

 In contrast to other polymeric insulation materials, silicones (also known as polydimethylsiloxanes) are not made up of a carbon to carbon backbone. Rather, they consist of repeating silicon-oxygen (siloxane) groups with two methyl groups each bonded to the silicon. As such, they differ widely from hydrocarbon-based materials. This contribution to INMR by...

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Pre-Coating RTV Silicone onto Glass Disc Insulators

Pre-Coating RTV Silicone onto Glass Disc Insulators

April 14, 2018 • ARTICLE ARCHIVE, Glass, Silicone & Other Materials, Utility Practice & Experience

Until recently, most applications of RTV silicone material have been as a remedial measure to mitigate pollution-related flashovers of insulators suffering poor service performance. Indeed, coatings have been viewed for years mainly as a maintenance product...

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Basics of RTV Silicone Coatings

June 3, 2017 • ARTICLE ARCHIVE, Insulators, Silicone & Other Materials

The application of RTV silicone coatings to porcelain and glass insulators in order to increase performance under pollution is not a new maintenance technology. Yet, while available for decades, not all power engineers fully understand its basics and what...

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Experience with Mold Growth on Silicone Bushings

May 6, 2017 • ARTICLE ARCHIVE, Bushings, Silicone & Other Materials

With the dramatic growth in application of composite insulators, there have been periodic reports concerning mold growth and its possible impact on electrical performance. Users will therefore need to know what is the best course of action to follow should...

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Flashovers Combatted at South African Substation

April 8, 2017 • ARTICLE ARCHIVE, Silicone & Other Materials

When an electrical network which has operated for years without problems suddenly starts to experience a growing number of insulator flashovers this is generally the result of service conditions that have deteriorated due to increased pollution. Should such...

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Effect of Biological Growths on Properties of Silicone Rubber Housings

November 14, 2016 • ARTICLE ARCHIVE, Silicone & Other Materials

In what must be seen as a rare meeting point of the fields of microbiology and HV engineering, a growing number of utility engineers are reporting the presence of biological growths on composite insulators. This phenomenon seems to be relatively independent...

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Polymeric Materials for Outdoor HV Insulators

December 12, 2015 • ARTICLE ARCHIVE, Commentary by Pigini, Silicone & Other Materials

It may come as a surprise to some but polymeric type insulators have been applied on high voltage lines and at substations since as far back as 1960. The best measure of their success in delivering real benefits versus traditional ceramic technologies is that...

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Silicones Offers Better Solutions for Cable Accessories

Silicones Offers Better Solutions for Cable Accessories

October 27, 2015 • ARTICLE ARCHIVE, Cable Accessories, Silicone & Other Materials

Silicone elastomers, gels, fluids and pastes are perhaps best known in INMR for their increasing use in insulators, surge arresters and coatings. But these same polymers are also finding growing application in a sophisticated new generation of MV and HV cable...

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