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General porcelain insulators material is composed of of gossan, tempered glass or ceramic and steel legs, and the total cement glue adhesive as one.
High-voltage wire is connected to one end of the tower and hung up a lot of disk-shaped insulators, it is in order to increase the creepage distance, usually made ​​of glass or ceramic, called insulators.
Path is to prevent dust and other filth attached to the surface of the insulator to form the insulator voltage across breakdown that creepage. Therefore, increasing the distance from the surface, that creepage distance, the distance along the insulating surface discharge the leakage distance call creepage distance. Creepage distance = the highest surface distance / system voltage. According to the different degrees of filthy, heavy pollution areas creepage distance of 31 mm / kV.
Zero value insulator refers to the potential distribution of the ends of the insulator in the operation is close to zero or equal to zero insulator.
Zero or low value Insulator: the wire insulation of the line depends on the insulator string, and will continue deterioration due to manufacturing defects or the role of the outside, the insulating properties of the insulator, when the insulation resistance is reduced or zero referred to as low or zero value insulator . We had lines to detect zero or low value porcelan insulators proportion is as high as 9 percent. This is the other main reason for the company's lightning trip with high.porcelaininsulator is smooth, and can reduce the capacitance effect, between the wires in order to reduce the elecricity.