Computer Aided Design of the Substation Grounding System

This paper deals with design of the substation grounding system by using computer. As it is well known, proper design of the grounding system is most important part of the whole project of the substation, from safety point of view. Procedure of the measurement of the soil resistivity and interpretation of the measured results is given. Interpretation of the soil resistivity data and results of interpretation are explained. Also, calculation procedure of potential distribution of the complex grounding system, grounding system resistance, distribution of touch and step voltage by using a computer are presented. Whole procedure was implemented on the real substation grounding system. Results of the potential distribution on the ground surface of substation touch voltages and step voltages are calculated in the paper. Finally, analysis of the capacitor bank's underground steel construction influence on all relevant parameters of the grounding system is given in this paper.