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High-voltage wire is connected to one end of the tower and hung up a lot of disk-shaped porcelain insulators, it is in order to increase the creepage distance, usually made ​​of glass or ceramic, called insulators.

In order to prevent dust and other filth attached to the surface of the insulator, the formation of the pathway is the voltage across the insulator breakdown, that creepage. Increase the distance from the surface, that creepage distance the discharge distance along the surface of the insulation the leakage distance call creepage distance creepage distance = surface distance / maximum system voltage. according filthy varying degrees, heavy pollution areas creepage distance of 31 mm / kV.