126kV Drop Tongue Fitting Polymer Station Post Insulators

In contrast to composite long rods, composite post insulators are subjected mainly to loads which act perpendicular to the longitudinal axis of the insulator and thus produce bending stresses over the cross-section of the insulator. As a result of this bending load, composite post insulators use FRP rods of substantially greater diameter compared to composite long rods. Typical applications of composite post insulators include distribution insulators, vertical and horizontal line posts, busbar support insulators and railway catenary insulators.

Line post insulators are specifically designed to offer both mechanical support and reliable electrical insulation for conductors in medium- to high-voltage overhead power systems. Suitable for vertical or horizontal installation, they are well-suited for use in both distribution and transmission networks.

Composite insulators use several materials for their sheaths: silicone rubber, EPDM rubber, resin, and PTFE. Silicone rubber is the most common choice. The sheath of a composite insulator is the external insulating component, providing necessary creepage distances and protecting the core from external environmental factors and electrolytic corrosion.

Porcelain, glass, and composite insulators differ in their structures and the functions their materials perform. Porcelain and glass insulators are made of a single insulating material, with both mechanical and electrical functions handled by that material. Composite insulators, on the other hand, utilize different materials for each function, allowing each material to perform its optimal purpose.

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