Corrosion State Assessment Method of Grounding Grid Based on Regularized Least Square Method

Aiming at the problem that the corrosion failure of grounding grid was difficult to troubleshoot, based on the electrical network theory, a corrosion evaluation equation for grounding grid port resistance and corroded conductor branch resistance was established, and the regularized least square method was used to solve the problem of underdetermined and ill-posed equations. By comparing the relationship between grounding grid conductor branch resistance and corrosion degree, a corrosion degree evaluation criterion was developed. The grounding grid port resistance was simulated and calculated under the condition of different accessible node types, and the principle of measurement node selection was proposed to solve the problem of misdiagnosis in the case of nodes blind selection. Through simulation calculation and simulated corrosion test, it was proved that regularized least square method, evaluation standard of corrosion degree and selection principle of measurement nodes were feasible in the corrosion state evaluation of grounding grid.