Numerical Simulation of Currents Distribution Along Grounding Grid Buried in Horizontal Multi-layered Earth in Frequency Domain Based Dynamic State Complex Image Method |
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Authors: | Zhong-Xin Li Yu Yin Cui-Xia Zhang Liu-Cun Zhang |
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Affiliation: | China Electric Power Research Institute, Beijing, China |
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Abstract: | A new mathematical model for accurately computing currents along a grounding grid buried in a horizontal multi-layered earth model has been developed in this article, which is a hybrid of Galerkin’s method of moment and the conventional nodal analysis method; the propagation effect of an electromagnetic wave has been considered. The dynamic state complex image method and closed form of Green’s function of a dipole or monopole in the multi-layered earth model are introduced to enhance efficiency of the method calculation; meanwhile, an analytical formula for mutual induction and impedance coefficients calculation have been adopted to accelerate the calculation. Finally, some numerical results about the distribution of an electromagnetic field and currents along a grounding grid have been discussed, and some conclusions have been obtained. |
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Keywords: | dynamic complex image method hybrid method Garlerkin’s moment method closed form of Green’s function grounding grid |
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