Fig. 3 shows the transient behaviours of the currents in
the points PLI, PL2 and in the no 1 rod of the earthhing
installation (see Fig. 4), computed for a 100 Rm value
of the ground resistivity, within the O-50 l.ts time
interval, with reference to a stroke on the structure at
the point A showed in figure 4.
Fig. 5 represents the time-behavior of the potential-toearth
of the point at which the structure receives the
stroke.
In order to point out the influence of the non-linear
ground impedance, Figgs. 6 show the transient
behaviours of the currents through two points of the
structure with reference to three values of the ground
resistivity.
The maximum values of the transient currents at the
points Pi-Pi4, for two values of the ground resistivity,
are shows in Figgs. 7.