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Insulator structure

 Insulator structure can be divided into six parts: Core, Housing, Weathersheds, End Fitting, Coupling Zone and Interface. These structures has important role in the insulator system.

Insulator structure

Core: The core is the internal insulating part of a composite insulator. It is intended to carry the mechanical load. It consists mainly of glass fibers positioned in a resin matrix so as to achieve maximum tensile strength.
Housing: The housing is external to the core and protects it from the weather. It may be equipped with weather sheds. Some designs of composite insulators employ a sheath made of insulating material between the weathersheds and the core. This sheath is part of the housing. Weathersheds: Weathersheds are insulating parts, projecting from the housing or sheath, intended to increase the leakage distance and to provide an interrupted path for water drainage.
End Fitting: End fitting transmit the mechanical load to the core. They are usually made out of metal.
Coupling Zone: The coupling zone is the part of the end fitting that transmits the load to the line, to the tower, or to another insulator. It does not include the interface between the core and the fitting.
Interface: An interface is the surface between different materials. Examples of interface in composite insulators are as follows.

The quality of insulator structure will affect the normal operation of the whole circuit. So selection of high quality is must.


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