The leakage current is closely relative to the development of contamination flashover

and monitoring leakage current is an important measure to evaluate the contanmina-tion status of insulator. The high frequency leakage current of glass insulator is studied based on the artificial pollution tests in order to avoid the disadvantages of traditional leakage current measurement. In the paper

the amplitude

waveform and frequency spectrum of high frequency leakage current are analyzed. Finally the characteristics of high frequency leakage current are stated

and the relativity between the characteristic parameters and the ESDD is discussed.