300 kV 160 kN polymer insulator

Polymer insulator is usually comprised of ECR fiberglass core rod, sheds and sheath, end-fittings.

ECR fiberglass core rod

The ECR fiberglass core rod is the load-bearing component of the composite insulator, and it is also the main internal insulation part. It has high mechanical strength, insulation performance and long-term stability. The core rod material generally uses resin reinforced unidirectional glass fiber rod.

Sheds and sheath

Sheds and sheath are the outer insulating part of the composite polymer insulator, and its function is to make the composite polymer insulator have sufficiently high external insulation performance against moisture flashover and pollution flashover, which will protect the core rod from atmospheric attack. Sheds and sheath are exposed to the outdoors for a long time, and are subject to various severe weather conditions and industrial pollution. They may also be ablated by spark discharge or local arcs under operating conditions. Therefore, it is usually required that the sheds and sheath must have excellent anti-fouling flashover, tracking resistance and electrical corrosion resistance, as well as resistance to atmospheric aging such as ozone and high temperature.

Bonding layer

The bonding layer is the interface between the core rod and the sheath. It penetrates between the two ends of the fittings and is another main part of the insulation in the composite insulator. If the bonding quality is not good, it will become a part of the operation of the composite insulator in the future. weakness.

End-fittings 

End-fittings are assembled with the core rod of polymer insulator to stand the mechanical load. One side of the insulator will be contact with the conductors by end-fittings, and other side will be contact with pole (or tower) by metal contactors joined with end-fittings. Mechanical load will be transit through the end-fittings. The quality of the hardware and its connecting structure with the core rod directly affects the strength of the core rod and the mechanical properties of the composite insulator.