Evaluation of soil resistivity and design of grounding system for hydroelectric generating station in a hilly terrain — A case study

This paper presents the study results of soil resistivity measurement and design of grounding system involved for a hydroelectric generating station located on a hilly terrain which were carried out by CPRI. This paper focuses on Soil resistivity measurement for different seasons in a year such that the worst value to be considered for the design calculation. The effectiveness of temperature on soil resistivity is discussed. One of the techniques to bring down the ground resistance for the overall grounding system in hydroelectric generating station on a hilly terrain is also discussed.