Analysis of Error Correction for Backward Grounding resistance measurement method with short lead wire Considering Shunt Phenomenon

In order to ensure the safe and stable operation of the substation, it is necessary to test and evaluate the substation grounding grid. In the actual measurement process, since the overhead ground wire is difficult to disconnect from the ground network, in order to obtain accurate measurement results, it is necessary to consider the influence of the shunt phenomenon on the grounding resistance measurement of the grounding network. In recent years, the resistance measurement method with short lead wire has gained wide attention due to the advantages brought by its shorter measurement leads. Based on the backward measurement method with short lead wire, this paper considers the influence of the shunt coefficient on its measurement results, proposes a correction formula through theoretical derivation, and proposes an improved method of it, which is verified by simulation. The improved method proposed in this paper improves its accuracy while preserving advantages of the original method, and it has certain significance for the measurement of large-scale grounding grids.