Earth Resistivity Measurement Interpretation Techniques

TLDR

Earth resistivity measurement interpretation techniques were developed under a major EPRI research project on transmission line grounding. The techniques comprise graphical curve matching against theoretical Master Curves and the RESIST computer program, which builds on analytical methods from a long‑running program. For electrode spacings of 2.5 m or more, both techniques yield satisfactory agreement between measured and computed resistivity values.

Abstract

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.