Earth Resistivity Measurement Interpretation Techniques

Earth resistivity measurement interpretation techniques developed as part of a major EPRI research project on transmission line grounding are described and discussed. The interpretation techniques include graphical curve matching and an advanced computer program (RESIST). The curve matching technique requires a set of theoretical Master Curves with which a field curve can be compared directly. Program RESIST is based on the analytical methods used in a more elaborate computer program which has been in operation for several years. For an electrode spacing of 2.5 meters or greater, satisfactory agreement is obtained between measured and computed results using both interpretation techniques.