Post insulator is a special insulation control, which can play an important role in overhead transmission line. In the early years, post insulators were mostly used for electric poles, and gradually developed in the high-voltage electric wire connection tower. Many suspension insulators were hung at one end to increase the creepage interval. They are generally made of silica gel or ceramics, which is called insulators. The insulator will not have the effect of flashover due to the change of the service conditions of the overhead line and the ground. Otherwise, the insulator will not have the effect of flashover due to the change of the service conditions of the overhead line.
Many disc-shaped insulators are hung at one end of the high-voltage wire connection tower to increase the creepage interval. They are generally made of glass, ceramic or rubber, which is called insulators. In order to avoid floating dust and other pollutants adhering to the insulator surface and forming a path, it is flashed and broken down by both ends of the insulator, i.e. creepage Therefore, increasing the outer surface interval, i.e. creepage distance, and discharging interval along the outer surface of insulation, i.e. leakage interval, is called creepage distance Creepage distance = outer space / higher system voltage According to the degree of pollution, the climbing distance is generally 31 mm / kV in heavily polluted areas. Zero value insulator refers to the insulator whose potential distribution at both ends of the insulator is close to or equal to zero during operation. Influence of zero value or low value insulator: the insulation of line conductor depends on insulator because of manufacturing defects or external effects, such as dirty insulator surface, lightning stroke, etc. The insulation performance of the insulator will deteriorate continuously. When the insulation resistance decreases or is zero, it is called low value or zero value insulator. The insulator is lubricated, which can reduce the capacitive reactance effect between wires and reduce the loss of current.
