Hybrid outdoor insulators

Attempts to reduce outdoor insulator problems caused by exposure to wetting, weathering, contamination, and vandalism are examined. Three main approaches are discussed: (1) improving the insulator's shape, both to get longer creepage distance and to improve pollution catch and wetting character...

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Bibliographic Details
Published in:IEEE electrical insulation magazine 1988-07, Vol.4 (4), p.11-15
Main Author: Looms, J.S.T.
Format: Magazinearticle
Language:English
Subjects:
Ceramics
Environmentally friendly manufacturing techniques
Insulation
Insulator testing
Porcelain
Sealing materials
Shape
Surface contamination
Surface cracks
Thermal pollution
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Summary:Attempts to reduce outdoor insulator problems caused by exposure to wetting, weathering, contamination, and vandalism are examined. Three main approaches are discussed: (1) improving the insulator's shape, both to get longer creepage distance and to improve pollution catch and wetting characteristics; (2) changing the nature of the surface so as to defeat contamination and wetting; and (3) reducing the insulator's brittleness, i.e. susceptibility to fracture, by changing the material. A hybrid insulator consisting of a cylindrical ceramic interior, elastomeric sheath, and sealant is described that meets the requirements. The first commercial application, a 25-kV railroad insulator consisting of a 75-mm diameter porcelain rod, a finned sheath applied by heat-shrinking, and a mastic sealant has proved highly satisfactory both indoor tests and at naturally polluted stations. The impact resistance results showed that the hybrid insulator resist a shotgun blast.< >
ISSN:0883-7554
1558-4402
DOI:10.1109/57.7985