| Polymeric Insulators |
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| by: Kapal Sharma RD:
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| Electrical insulator is a very important component in the electric power systems such as sub-stations
and distribution & transmission lines. In-depth study and practical knowledge on this subject is
necessary for the electrical professionals in the electrical power field. In the early days, insulators
were made of ceramic and glass materials. But in 1963, polymeric insulators were developed and its
improvements in design and manufacturing in the recent years have made them attractive to utilities.
It is consist of a fiberglass core rod covered by weathersheds of skirts of polymer such as silicone
rubber, polytetrafluoroethylene, EPDM (ethylene propylene diene monomer) and equipped with
metal end fittings. It is also called composite insulators, which means made of at least two insulating
parts – a core and housing equipped with end fittings. Polymeric insulators have many advantages
over the ceramic and glass insulators such as good performance in contaminated environment, light
weight, easy handling, maintenance free, and considerably low cost etc. Because of these properties it
is gaining popularity worldwide and replacing the conventional ceramic and glass insulators.
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