Abstract
Insulator is an essential part of overhead line. In recent years, the news about the insulator flashover is increasing. The main reason of insulator flashover is insulator surface contamination. Insulator flashover is a serious threat to the safe and stable of transmission lines operation. With the development of China's comprehensive national strength, power companies and power users demand on grids stability is highly increased. Currently usual methods of insulator monitoring are ESDD (equivalent salt deposit density), experiment and on-line detecting of leakage current [. But they can't fully meet our requirements. Now this paper will present a new method, which is made correlation analysis by harmonic analysis based on two ends of the existing lines to the data acquisition apparatus of voltage and current signals. Without additional hardware devices online monitoring of insulator surface contamination can be achieved.
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