A mathematical approach for studying interconnected earthing systems inside MV networks

Abstract

PurposeThe purpose of this paper is to define a new methodology for studying interconnected earthing system inside unearthed medium voltage (MV) networks.Design/methodology/approachThe developed methodology is based on the division of the MV network into simpler sub‐systems and its resolution using a multiport approach.FindingsThe methodology has been applied to various situations giving precious information on the behaviour of the interconnected earthing systems. The comparison between the results of the simulations and measurements done on a really existing network has shown that the methodology is able to provide accurate results.Research limitations/implicationsSome factors can influence the precision of the methodology. Indeed, for a correct simulation of the system it is necessary to know several electrical and geometrical parameters, often obtainable with difficulty.Practical implicationsUtilities are quite interested in this topic. The study of interconnected earthing systems in MV networks with the purpose of identifying safe extended areas named Global Earthing Systems has important management and economic consequences.Originality/valueThe paper presents a new analysis methodology applicable to MV networks that surpasses the limits of the analysis methodology generally applied for the study of the same topic in high voltage networks.