Experimental Study on High Frequency Pulse Current Variation Characteristics of Pollution Discharge of Insulators

Pollution flashover of insulators is an important factor causing trip of transmission lines and even large-scale blackouts of power grids. At present, the research on pollution discharge of insulators mainly focuses on leakage current monitoring, while leakage current detection mainly focuses on the low-frequency components of the discharge process, and the research on high-frequency discharge characteristics is rare. In this paper, the voltage is monitored based on the coupling capacitance partial voltage method. The high-frequency current is monitored based on the Rogowski coil principle. The characteristics of high frequency pulse discharge in safety zone, forcast zone and danger zone are analyzed. The results show that the pulse amplitude and repetition rate increase significantly with the increase of discharge. The statistical law of high frequency pulse current can reflect the severity of pollution discharge and realize early warning.