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External grounding grid is an effective measure to reduce grounding resistance of grounding grid. In order to meet the requirements of the grounding resistance in the most economical way, it is important to determine the distance and the area of the external grounding grid. Generally speaking, when the area is larger, the grounding resistance is smaller. When the distance of the external grounding...
Based on finite-element method of 1-dimensional conductor element coupled with 3-dimensional soil element, a coordinate transformation is carried out. The irregular hexahedron domain of element is mapped onto a cube domain. Considering the frequency dependent characteristic of the discretized elements, the grounding performance of the substation grounding grids in multilayer earth is analyzed, and...
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