Grounding Analysis of a Large Electric Power Station

A complete analysis of an extensive grounding system of a large electric power station is presented. Major procedures necessary for an accurate analysis of a large grounding system have been demonstrated. These procedures include constructing adequate soil structures based on short and long traverse soil resistivity measurements, measuring and interpreting the ground impedance of a large grounding system, determining if the worst fault occurs inside or outside a power station, and selecting appropriate fault locations to cover the worst scenarios in the safety evaluations of the grounding system. The procedures presented in this paper can be used as a guide when dealing with extensive grounding systems in large electric power stations.