High voltage composite insulator and method of making same

Details High voltage composite insulator and method of making same High voltage composite insulator and method of making same

1986-01-27

1988-02-09

Askin, Laramie E.

Electricity: conductors and insulators

Insulators

Through wall or plate

29450, 29631, 156 86, 156294, 174179, 174209, H01B 1702, H01B 1726, H01B 1900

Patent

active

047242841

ABSTRACT:
A high voltage composite member, such as a support insulator or a bushing, comprises a core and a sheath of elastomeric material vulcanized to the core and at least one module of elastomeric material having an external shed and an inner cylindrical surface of predetermined normal diameter. The sheath has circumferentially continuous external bulges overlapping and engaging the ends of the inner surface to hold the module permanently in a desired location on the sheath, the module being substantially free of deforming stress. A sealing material provides a sealed interface between the module and sheath.
A method of making the member comprises the steps of providing a core having an unvulcanized sheath of elastomeric material thereon, the sheath having a substantially constant outside diameter, providing a module of elastomeric material having an external shed and an inner cylindrical surface of predetermined diameter which is less than the sheath outside diameter, expanding the diameter of the inner surface to permit the module to be slid over the core, placing a sealing material upon the inner surface, sliding the module over the core to a desired location, allowing the module to shrink its inner surface to the sheath outside diameter, and applying heat to vulcanize the sheath and concurrently displace sheath material from within the inner surface as the module returns substantially completely to its unexpanded normal diameter to form bulges adjacent both ends thereof to hold the module in its desired location. The module is substantially free of residual mechanical stress.

REFERENCES:
patent: 3898372 (1975-08-01), Kalb
patent: 4212696 (1980-07-01), Lusk et al.
patent: 4296276 (1981-10-01), Ishihara et al.
patent: 4312123 (1982-01-01), Wheeler
patent: 4555839 (1985-12-01), Thurber

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