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Railway composite insulators

Railway composite insulators divided into suspension long rod insulators and line post insulators are used for traction lines for supporting and insulating wires.

Railway composite insulators

The development of composite insulator in China dates back to the early 1970’s. In the 1990’s polymer insulators have become widely used in China. At present, up to 600000composite insulators are operating on 35kv to 500kv ac overhead transmission lines.

Nowadays, silicone rubber is popular used in electrical insulators and are operating in various contamination conditions, which is manufactured in different voltage level insulators. 27.5kv railway insulators or 25kv insulators are widely used in China railway systems.

The advantages of Railway composite insulators
◆ They have successfully and efficiently avoided serious pollution flashover
◆ Which occurred frequently when conventional ceramic insulators were used
◆ And radically reduced the maintenance cost of transmission lines in pollution areas

Railway composite insulators consist of silicone rubber housing, FRP core and end fittings. Properties of materials such as silicone rubber and fiberglass reinforced polymer rods, electrical and mechanical performance, and aging resistance as well as are evaluation and inspection of composite insulators.


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