PROCESS OF MANUFACTURE OF INSULATING TIE ROD FOR SUPPORTING HIGH VOLTAGE ELECTRICAL DEVICES AND INSULATING TIE ROD

摘要

An insulating stay comprises: a central core (1) having high electrical resistance and high tensile strength; a sheath (2) of high electrical resistivity and comprising fins (3) to offer a maximum resistance path to possible surface current losses; and end fittings (4). The central core is made of resin reinforced with long, continuous fibers, and advantageously of epoxy resin reinforced with glass fibers. The sheath (2) is made of a natural or synthetic polymer, and advantageously of EPDM elastomer. The stay is manufactured by coating the central core (1) with a high viscosity glue (8) having high longitudinal resistivity, then wrapping said glue-covered core in a hollow tube (5) of raw elastomer and placing the assembly in a mold (5) where said fins (3) are formed in the sheath (2) and where the raw elastomer (5) is polymerized by vulcanization or reticulation. The stay is intended for bracing electrical installations that need to be insolated and placed at some distance from the ground.