Transient behavior of vertical grounding electrode under impulse current

This paper aims to study the transient behavior of vertical grounding electrode under impulse current and buried in homogeneous soil. We have interested to the variation of the grounding impedance as function of frequency as well as the evolution of the transient potential using Transmission Line Method (TLM) in domain time. Several current magnitudes and soil resistivities and permittivities have been considered. This study has been carried out incorporating or not the soil ionization phenomenon. The obtained results have been confronted to those found by other researcher using Hybrid Electromagnetic Method (HEM). A good accordance has been obtained. As main results, soil ionization generates a decrease of the transient potential. Such decease is accentuated for high current magnitudes and high soil resistivities.