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It's important to study the influence of two typical mountainous terrains on impulse impedance of grounding device for lighting protection. According to the local terrains of transmission towers, three dimensional impulse impedance computation models for tower grounding device, considering two typical terrains, are established based on the finite element method(FEM). The open boundary field is transformed...
This paper presents a numerical method, combined the finite element method in the spatial domain with the finite difference time domain, to calculate the transient impulse response of grounding systems considering the ionization phenomenon. In this numerical method, space-time variable soil resistivity is used to simulate the soil ionization phenomenon where soil resistivity is controlled according...
The aim of this paper is to calculate the response of grounding system under high-magnitude fault current accurately. In this work, A FEM model is presented to solve the problem in frequency domain. The ionized phenomenon in the soil around the grounding electrode is taken into account by setting the resistivity of every soil element varying with the electric field intensity. Open boundaries of earth...
A simulation model based on finite-element method is presented to analyze the soil ionization phenomenon around the grounding system under the impulse current. In this method, The non-linear characteristic of soil under an accidental short circuit or a stroke of lightning is taken into account by setting the resistivity of soil element varying with the electric field intensity of every element; open...
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