Validation of the earth resistance formulae using computational and experimental methods for gas insulated sub-station (GIS)

► This paper shows the mathematical formulas for the earth resistance value of a gas insulated sub-station (GIS). ► The work involves of resistivity measurements and then interpretation as two layers of soil. ► This study compares the formulas available in previously published work and the results obtained for the field site. ► Similar results between analytical and experimental results were found, which shows both methods are valid.