초록 ▼

The invention discloses resulting products and a method of producing high voltage resistant members employed in electrical installations such as bushings and insulators. The method comprises placing a sheath of unvulcanized elastomer on a core, which for example is a fiberglass rod, for example by e

The invention discloses resulting products and a method of producing high voltage resistant members employed in electrical installations such as bushings and insulators. The method comprises placing a sheath of unvulcanized elastomer on a core, which for example is a fiberglass rod, for example by extruding the sheath thereon, and mounting at least partially vulcanized sheds on the sheath therealong, then vulcanizing the sheath to form an integrated high voltage resistant member. The sheath is unvulcanized when the sheds are mounted thereon and then the sheath is heated to vulcanize it, in order to bond it to the sheds and to the core. The sheds also can be molded directly onto the sheath together therewith in steps along the length of the core. For producing a bushing, the sheath is placed on a core formed of a conductive stud wrapped with paper and metal foil and then impregnated with a suitable hardenable resin.

대표청구항 ▼

A method of making a conductive insulated oil-less bushing, said method comprising steps as follows: placing a sheath of an essentially completely unvulcanized elastomer on a core, the core being a conductive rod with a covering thereon and the elastomer being selected from the group consisting of e

A method of making a conductive insulated oil-less bushing, said method comprising steps as follows: placing a sheath of an essentially completely unvulcanized elastomer on a core, the core being a conductive rod with a covering thereon and the elastomer being selected from the group consisting of ethylene-propylene-diene monomer rubber, ethylene-propylene monomer rubber and butyl rubber, said placement being performed at a temperature below the vulcanizing temperature of said sheath, mounting at essentially room temperature a plurality of fully vulcanized elastomeric sheds on the sheath, the sheds being of a material of the same or similar formulation as used for the sheath, and then heating the core, sheath and shed assembly to between 140°to 200°C. to vulcanize the sheath and to bond same to the core and to the sheds so as to form said conductive oil-less bushing. A method of making a high voltage resistant integrated member, said method comprising steps as follows: extruding a sheath of an essentially completely unvulcanized elastomer on a core; said extrusion being performed at a temperature below the vulcanizing temperature of the elastomer, the elastomer being selected from a group consisting of ethylene-propylene-diene monomer rubber, ethylene-propylene monomer rubber and butyl rubber, mounting at essentially room temperature at least one fully vulcanized elastomeric shed on the sheath, the shed being fabricated from a material of the same or similar elastomer formulation as used for the sheath, and then heating the core, shed and the sheath assembly to between 140°to 200°C. to vulcanize the sheath and bond same to the core and to the shed so as to form said high voltage resistant member.