The analysis of the equivalent lumped-constants
network, through which the protection system is
simulated, is effected through the use of SPICE. In this
analysis each branch of the system is divided in a
suitable number of elements, in order to take into
account the propagation phenomena. The distributions
of the currents due to the stroke upon a point of the
structure are put into evidence and subjected to
analysis. Finally the influence of the ground resistivity
upon said distributions is examined.