Location and topology of substation grounding grids are critical for its regular tests and safe operation. Schematic drawing of the grounding grid is prone to getting lost or damaged. As excavation is costly and time consuming, locating substation grounding grid is important. This paper proposes a novel method to locate substation grounding grid by using the derivative method and the concept of locating a geometrical object in polar coordinate system. Due to rectangular structure of grounding grid, its location can also be determined from the location of its single branch. Simulation and experimental results verify that the proposed method is feasible and accurate to solve the inverse problem regarding the location of substation grounding grid.
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