R. Tommasini, R. Pertusio, and S. Toja (Italy)
Power distribution, global earthing systems, touch
voltages, step voltages.
This research work was devoted to the study of a real
global earthing system. It was organized into two stages.
During the first one several experimental measurements
were performed, while during the second one a FEM
approach was used. The international standards on power
distribution have introduced the concept of "global
earthing system", i.e. an area with a high density of
substations where, due to the reciprocal connection of the
local earthing systems of each substation, there is no
danger of touch and step voltages. Aim of this work is the
identification of the features that an earthing system must
have to be considered as a global one.