Comparison of different models for determining the grounding rod resistance
Calculation methods, simulations and experimental measurement are carried out in the paper. The procedures include Method of Moments (MoM), empirical engineering equations for design of horizontal and vertical grounding rod electrodes, simulations and experimental validation. Calculation of grounding rod electrode resistance was performed with different empirical formulas. Obtained results by using these empirical equations that are used to estimate a grounding grid resistance in order to obtain required parameters such as touch and step voltage, maximum current, minimum conductor size and electrode size and maximum fault current level, are compared with simulation and experimental results. 3D simulation was performed in case of rod electrode with actual dimension and for this purpose FEM (Finite Element Method) – COMSOL software package is used and the potential distribution and resistances have been determined.