WAVE PROCESSES MODELING IN THE VERTICAL GROUNDING ELECTRODE UNDER LIGHTNING IMPACT
The paper presents the results of testing grounding devices (GD) of power lines under impulse impact. The modeling of current spreading in vertical electrodes of various lengths in soils with different electrophysical parameters in the wave formulation of a coupled electromagnetic field is carried out. On the basis of the results obtained, the main factors affecting the formation of wave processes of a vertical ground electrode were determined: in soils with high dielectric permittivity and/or specific resistance, wave processes are observed better; an increase in the length of the electrode leads to a decrease in the frequency of oscillations of the ground electrode current in the homogeneous soil. The observed wave processes can affect the transient impedance of the GD and the effectiveness of lightning protection using, for example, non-linear surge arresters.