Research on Discharge Characteristics of Plastic Cloth on Overhead Transmission Lines Under AC Voltage

The environment of transmission lines is relative complex, making the transmission lines face the threat of foreign matter intrusion. In view of this situation, this paper measured the equivalent salt density and gray density of the surface of the plastic cloth, and also studied the conductivity of the plastic cloth. This article consisted of following parts: Firstly, this paper studied the electrical conductivity of plastic cloth. Then, this paper studied the influence of the geometrical size and the lap way of the plastic cloth on the discharge characteristics by analyzing the conductivity of different solutions. When the plastic cloth completely overlaps the two transmission lines, flashover is most likely to occur in this case; When the plastic cloth does not completely overlap the transmission line, as the voltage increases, corona discharge can be observed on the plastic cloth; When the plastic cloth is wound around the insulator, as the voltage increases, the gap between the plastic cloth and the equalizing ring is broken down. In this case, the conductivity of rainwater has a general effect on the flashover voltage when the plastic cloth is wrapped around the insulator.