The role of post insulators

    Tower of power lines connected at one end to hang a lot of disk-shaped insulator, it is to increase the creepage distance, usually made of glass or ceramic, called insulators. In order to prevent dust and other contamination in the insulator attached to the surface, forming a path is the voltage across the insulator breakdown, ie creepage. Therefore, increasing the surface distance, ie creepage distance along the insulating surface discharge distance that is called crawling distance from the leak. Creepage distance = surface distance / System highest voltage. Depending on the degree of contamination, heavy contamination areas generally use the creepage distance of 31 mm / per kV.

     Zero value refers to the operation of the insulator insulators potential distribution across the insulator close to zero or equal to zero.

 Effect of zero or low values insulator: insulated wire line depends on the insulator strings, because of manufacturing defects or outside the role of insulation insulators will continue to deteriorate when the insulation resistance is reduced to zero or low or zero value called insulators We had lines for testing, the proportion of zero or low values as high as insulators around 9%, which is higher than the company line lightning trip to another main reason. Insulators are smooth, it can reduce the capacitance effect between the wires, in order to reduce the loss of current.