Numerical calculation of substation grounding grid corrosion based on node voltage method

According to change of grounding impedance and surface potential after grounding grid was corroded,this article calculated the changing condition of grounding impedance and surface potential based on node voltage method with unequal potential.The method can estimate the corrosive severity of grounding grid and provide the modification scheme for grounding grid corrosion.The model can judge the operation condition of grounding grid even when the frequency of earth current reaches dozens of kHz.