Numerical simulation grounding system buried within horizontal multilayer earth in frequency domain

Abstract

SUMMARYA novel mathematical model for accurately calculating the currents flowing along the conductors of grounding system below high voltage a.c. substations and nearby floating metallic structure buried in horizontal multilayer earth model has been developed in this paper. Not only the mutual conductive and capacitive coupling influences of leakage currents, but also mutual inductive coupling influence of network currents flowing along the conductors of grounding system and nearby floating metallic structure in the horizontal multilayer earth model have been considered in this model, and only propagation effect of electromagnetic wave within limited area of the substation has been neglected. The quasi-static complex image method and closed form of Green's function are introduced into this model to accelerate the calculation. The model is then implemented in a computer program, which can be used to calculate currents distribution along the conductors of any configuration of grounding system, and with or without floating metallic structure under some hundreds of kHz frequency harmonic wave.

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“…The Green"s function [22][23] is used to calculate the potential caused by a point source. For a point source in the earth as shown in fig.…”

Transient behavior of wind towers grounding systems under lightning strikes

“…The goal of the proposed hybrid method [18][19][20][21] is to obtain a frequency-dependent equivalent electric circuit, as done in other fields [22][23][24][25] for the grounding system where all the inductive, capacitive and conductive couplings among different conductor elements are accounted for and their analysis can be carried out in the frequency domain.…”

Numerical calculation of grounding system buried in vertical earth model in low frequency domain based on the boundary element method

“…Specially the BEM is used in References [6,8,9,[18][19][20][21][22], otherwise the MoM is used. Meanwhile, we found that different electromagnetic theory has been introduced to solve the problem, direct current electric field or electrostatic field theory has been used in References [4,6,[8][9][10][11][12]17,18], quasi-static electric field theory has been introduced in References [5,7,[14][15][16][19][20][21][22].…”