Corrosion Condition Detect of Entire Grounding System in a 500kV Converting Station Using Electrical Impedance Imaging Method

This paper suggest an electrical impedance imaging method to detect the corrosion condition of grounding system in online substation directly and reliable. In this paper the principle of this method has been elaborated and we also applied this method in a 500kV substation to check the accuracy. The results shows this method is reliable.