Title :
Grounding Performance Analysis of the Substation Grounding Grids by Finite Element Method in Frequency Domain
Author :
Qi, Lei ; Cui, Xiang ; Zhao, Zhibin ; Li, Huiqi
Author_Institution :
Beijing Key Lab. of High Voltage & EMC, North China Electr. Power Univ., Beijing
fDate :
4/1/2007 12:00:00 AM
Abstract :
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. In comparison with the method of moment (MoM) and the measured results, the presented method is proved to be correct and effective. Furthermore, we can calculate the H-field generated by the substation grounding grids with both currents in the underground conductors and leakage currents flowing in the soil. The results show slight difference between FEM and MoM, which can be explained by the fact that the leakage currents in the soil are not taken into account for MoM
Keywords :
conductors (electric); earthing; finite element analysis; frequency-domain analysis; leakage currents; method of moments; power grids; substations; 1D conductor element coupling; 3D soil element; FEM modeling; H-field generation; MoM; finite element method; frequency domain; grounding performance analysis; leakage currents; method of moment; substation grounding grids; underground conductors; Conductors; Finite element methods; Frequency dependence; Frequency domain analysis; Grounding; Leakage current; Moment methods; Performance analysis; Soil; Substations; Finite-element method (FEM); frequency domain method; method of moment (MoM); substation grounding grids;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.892283
