Modelagens e solução de aterramentos sujeitos a surtos de corrente: respostas nos domínios da frequência e do tempo
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2016-03-29
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Universidade Federal de Goiás
Resumo
In the grounding systems analysis, the investigation of the effects caused by lightning
discharge is a crucial task, since it is the main electromagnetic phenomena responsible for
electricity outages which can be the cause of severe mechanical and thermal stresses on
electric installations. This dissertation presents a study of transient behavior for various
grounding configurations subject to impulsive currents originated from incident discharges.
The model is named hybrid electromagnetic model, because it is based on electromagnetic
equations and it is used concepts of electrical circuit analysis. The modeling is performed
in frequency domain considering the effects of electromagnetic propagation on the metal
electrode and into surrounding soil. In the numerical solution of model is used the method
of moments for the discretization of the electrodes and calculus of the impedances. This
methodology also considers the variation of electric soil parameters when frequency
varies. The modeling comprised the effects of propagation and electromagnetic couplings
between the grounding electrodes. Results were obtained for simple electrodes (wire
horizontally buried in the soil or a vertical rod) and grounding grid in square format from
the computational implementation of the mathematical model. This tool and the results
obtained lend itself to the determination of the grounding systems response subjected to
an injection of a typical current of lightning discharge. The validation of the tool which
resulted from this work is made by comparing the obtained results with results of similar
cases reported in the technical literature.
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SILVA, Bárbara Pereira. Modelagens e solução de aterramentos sujeitos a surtos de corrente: respostas nos domínios da frequência e do tempo. 2016. 126 f. Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Goiás, Goiânia, 2016.