Validation of Grid Formulas Using a Scaled Model of Earthing Grid System
Ignatius K. Okakwu *
Department of Electrical/Electronic Engineering, University of Benin, Benin City, Nigeria
France O. Akpojedje
National Institute of Construction Technology, Uromi, Edo State, Nigeria
Emmanuel S. Olowasogo
Department of Electrical and Computer Engineering, Kwara State University, Malete, Nigeria
Abel E. Airoboman
Department of Electrical/Electronic Engineering, University of Benin, Benin City, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
The main objective of a safe grounding design is to carry current into earth under normal and fault conditions without exceeding operating and equipment limits or adversely affecting continuity of service, also, to ensure that personnel within the vicinity of the grounding facilities are not exposed to the danger of electric shock. To attain these objectives, accurate determination of grid resistance is of paramount. This paper presents the comparison between grid formulas (analytical methods) used to calculate grounding resistance and experimental measurement. Also, variation of grid resistance with number of meshes was also examined.
Keywords: Grid resistance;, electrode, formula, experiment, mesh, resistivity