Composite suspension insulator,anti-pollution Composite suspension insulator

Composite suspension insulator can be divided into common insulator and anti-pollution composite suspension insulator or anti-fog insulator. Anti-pollution composite suspension insulator can be used heavily pollution areas.

anti-pollution Composite suspension insulator                      Composite suspension insulator
anti-pollution Composite suspension insulator         Composite suspension insulator             

Dirt, pollution, salt, and particularly water on the surface of a high voltage Composite suspension insulator can create a conductive path across it, causing leakage currents and flashovers. The flashover voltage can be reduced by more than 50% when the Composite suspension insulator is wet. High voltage insulators for outdoor use are shaped to maximise the length of the leakage path along the surface from one end to the other, called the creepage length, to minimise these leakage currents. To accomplish the surface is moulded into a series of corrugations or concentric disc shapes. These usually include one or more sheds; downward facing cup-shaped surfaces that act as umbrellas to ensure that the part of the surface leakage path under the 'cup' stays dry in wet weather. Minimum creepage distances are 20–25 mm/kV, but must be increased in high pollution or airborne sea-salt areas.

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