Calculation and Analysis of Pollution Flashover Voltage of Porcelain Insulator in Transmission Line under Overheavy Pollution Environment

Due to the shortage of transmission channels, individual transmission line towers inevitably need to pass through overheavy pollution environmental areas. The so-called overheavy polluted environment means that the SPS (site pollution severity) exceeds level-e. In the overheavy polluted environment, how to configure the insulation of transmission tower is a great test for the design, operation and maintenance of transmission line. Based on the above situation, through the existing test data, this paper predicts and calculates the flashover voltage($U$50%) of various types of disc suspension porcelain insulators; Through calculation, the external insulation configuration schemes under different ESDD (equivalent salt deposit density) are given to solve the pollution flashover problem of transmission lines in overheavy pollution environment.