A Noval IR Drop Elimination Methond for Polarization Potential Detection of Grounding Grid in Homogeneous Soil

To address the lack of high-precision trenchless detection technology in current polarization potential detection of grounding grids, this paper proposes an IR reduction and elimination strategy based on the finite difference method. By arranging a reference electrode array on the surface to detect the second-order derivative distribution of potential within the range of the array, the IR drop in the polarization potential detection of the grounding grid can be calculated, and the measurement results can be corrected. At the same time, based on CDEGS simulation software, this article studied the IR reduction calculation accuracy of the proposed method under different reference electrode spacing, and concluded that the optimal spacing is 1/4 of the buried depth of the grounding grid. After simulation analysis, the detection accuracy of the polarization potential of the grounding grid at this spacing is better than that of the near reference method.