Composite electrical insulator and method of forming same

Details Composite electrical insulator and method of forming same Composite electrical insulator and method of forming same

1988-02-12

1989-07-04

Askin, Laramie E.

Electricity: conductors and insulators

Insulators

With terminal elements

29631, 174179, 174209, H01B 1732

Patent

active

048453188

ABSTRACT:
The invention provides an electrical insulator comprising a cylindrical core (2) of an insulating refractory material, such as porcelain, onto a portion of the curved surface of which a sleeve (8) of insulating polymeric material is fitted. Metal end-caps (4), for electrically connecting the insulator, are fitted to the ends of the porcelain core such that there is an exposed portion (10) of the curved surface of the core between the sleeve and each end-cap. Thus, any damaging electrical activity which takes place at the metal end-caps is directed primarily onto the surface of the porcelain core (2), and not onto the surface of the electrically vulnerable polymeric sleeve (8), which serves to protect mechanically the relatively brittle porcelain core. Optionally, the polymeric sleeve (8) may have a convoluted or a shedded outer surface (12) to increase the leakage path length of the insulator, or to prevent the formation of a continuous moisture path, or both.

REFERENCES:
patent: 3812284 (1974-05-01), Pohl
patent: 4045604 (1977-08-01), Clabburn
patent: 4399064 (1983-08-01), Penneck

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