Composite polymer insulators

Structure of composite polymer insulators are ECR-FRP rod, HTV-silicone sheath and sheds, chemical bond, meta-stable silicone sealing and end fittings.

Composite polymer insulator               Composite polymer insulator

Structure of composite polymer insulators:
Typically composite polymer insulators comprise a core material, end-fitting, and a rubber insulating housing. The core is of FRP to distribute the tensile load. The reinforcing fibers used in FRP are glass (E or ECR) and epoxy resin is used for the matrix. The portions of the end-fitting that transmit tension to the cable and towers are of forged steel, malleable cast iron, aluminum, etc. The rubber housing provides electrical insulation and protects the FRP from the elements.

Although the design of composite polymer insulators is important, it has been found in long term tests, that the housing material is more important that the design. A good design with poor quality material will not perform. In comparative testing, the alternating shed design has been found superior to the straight shed design and the stacked shed design better than the distributed shed design. Phillips et al., in their work on corona aging, have shown the importance of stress grading rings.

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