Study On The Pollution Flashover Mechanism Of Composite Insulator In Contamination And Wet Conditions

The study of the pollution flashover mechanism has great significance to prevent external insulation accident and guarantee power system running steadily and safely. In this dissertation, the test methods were set down to measure hydrophobicity, leakage current and pollution flashover voltage of composite insulator in contamination and wet conditions. The fog chamber was built up. Based on these test methods, we have carried out a series of research work on the following three aspects: (1) the character of hydrophobicity losing and transferring of silicone rubber in contamination and wet conditions. (2) the relation between leakage current and hydrophobicity, conductance ratio of salt fog, ESDD(Equivalent Salt Deposit Density), NSDD(No soluble Deposit Density), relative humidity under nominal voltage. (3) the pollution flashover character of composite insulator in contaminant and wet conditions as well as the impact of hydrophobicity and ESDD on the flashover voltage.