This article is about the composite insulator design aspects and design for pollution performance. Composite insulator design is the most important part of manufacturing composites.
Composite Insulator – Design Aspects:
Polymer weathersheds
Silicone rubber, EPDM
One piece or multi piece design
3mm minimum thickness
Resin impregnated fiberglass core
Epoxy ester, vinyl ester, polyester
E glass or ECR glass
Metal end fittings
Compression
Glued wedge type (superseded)
Corona rings at EHV
Design for Pollution Performance:
Mechanism of Contamination Flashover
Build up of contamination on insulator surface
Light wetting of the pollution on the insulator surface
Build up of leakage current on the surface
Formation of scintillating arcs and associated audible noise level increases
Formation of dry bands and build up of electrical stress
Sparking discharges across the dry bands
The joining of the discharges to form a complete flashover
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