Monte Carlo procedure used for the case of a multi-conductor line above ideal and
lossy ground
Classification of ground flash locations
The distance of the prospective stroke location from the line y is assumed to be
uniformly distributed as far as a value ymax (in m) in Figure B.1. Beyond this
distance, it is assumed that none of the lightning events can cause a flashover on
the line.
From the total set of events, those relevant to indirect lightning within the distances
ymin and ymax are selected by adopting a lightning incidence model for the line to
establish ymin.
The striking distance model represented by Equation (B.1) is adopted. A comparison
between results obtained by adopting other different incidence models has been
presented in Borghetti et al. [B22].
For each indirect lightning event, the maximum induced voltage value on the line
from the first return stroke is calculated by means of the LIOV code described
above.