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The steel grounding grid buried in earth will corrode and become hidden danger to the safety of power system. It is difficult to get accurate status of corroded ground grid with traditional method. A novel method is presented in order to improve the efficiency and precision of diagnosis. A sine wave exciting current of different power frequency is injected directly into grounding grid by two ground...
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...
Based on finite-element method (FEM) of 1-D conductor element coupled with 3-D soil element, we take into account the frequency dependent characteristic of the discretized elements to analyze the grounding performance of the substation grounding grids. Compared with A-V formulation of 3-D FEM, the proposed method can greatly save the CPU time, and the frequency can be considered during FEM modeling...
A time domain electromagnetic field approach is proposed to investigate the lightning surge impedance of the full scale UHV tower with grounding system. The model, which is validated by comparing the result to those of other method, can be used to analyze the lightning surge performance of a power line more accurately. Finally, this method is applied to analyze the surge impedance and potential of...
Based on finite element method (FEM) of ID conductor element coupled with 3D soil element, we take into account the frequency dependent characteristic of the discretized elements to analyze the grounding performance of the substation grounding grids. Compared with A-V formulation of 3D FEM, the proposed method can greatly save the CPU time and the frequency can be considered during FEM modeling. In...
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