Silicone & Other Materials

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Pre-Coating RTV Silicone onto Glass Disc Insulators

Most application of RTV silicone material has traditionally 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... Read More

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... Read More

Basics of RTV Silicone Coatings

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... Read More

Experience with Mold Growth on Silicone Bushings

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... Read More

Flashovers Combatted at South African Substation

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... Read More

Effect of Biological Growths on Properties of Silicone Rubber Housings

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... Read More

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