500 kV composite line post insulator

Xiangyang Guowang Composite Insulators Co., Ltd. (GW) started commercial production of polymer line post (LP) insulators in 1996. We now offer line posts for transmission line applications of various voltage classes up to and including 500 kV. All of our insulators equip a one-piece, silicone rubber housing that is free of any joints. This housing is formed onto the core by a compression molding process. Our processes, design, and quality control provide a unique product that is unparalleled.

Process and Design Features

Compression Molding allows GW to form a continuous, one-piece, rubber housing up to 2000 mm long. The compression molding process utilizes an appropriate pressure and temperature for vulcanizing the rubber and bonding the housing to the core.

Chemical Bonding through use of a primer coating on the core, provides the needed strength to the interface between the rubber housing and core. The strength of this bond is greater than the tearing strength of the rubber housing itself. This type of bonding is important in order to prevent water/moisture from reaching the core.

Multi-Step Crimping with Pressure Gradation minimizes the concentration of mechanical stresses on the core by distributing the forces over a large core area. This process minimizes any mechanical strength degradation of the assembly.

Curved Crimping Dies designed to match the end fitting profile produce a uniform deformation that is coaxial with the center of the core. The uniform cylindrical shape helps to minimize mechanical stresses on the core for any loading direction.