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Porcelain insulator is a special kind of control, it is possible to play an important role in the overhead transmission lines. The early years insulators for wire rod, slowly developed in the high-type high-voltage wires to connect 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. The insulator plays two fundamental role in overhead transmission lines, support wires and prevent current back ground, the two role must be guaranteed, insulator failure should not change due to environmental and electrical load conditions led to a variety of electrical and mechanical stress, otherwise porcelain insulator would not have a significant role, it will damage the entire line and operating life.