Lightning stroke simulation by means of the leader progression model. II. Exposure and shielding failure evaluation of overhead lines with assessment of application graphs

For pt.I see ibid., vol.5, no.4, p.2009-22 (1990). To evaluate the lightning performance of transmission lines, extensive application of the leader progression (LP) model to the relevant geometrical configurations has been carried out. Basic configurations used in the LP computer program are presented together with the method of analysis of the lightning exposure of transmission lines located in the different orographic conditions of flat countries, ridges of hills, and along a mountain side. A computer program used to evaluate shielding efficiency and the total number of strokes to the line is considered. A set of application graphs referring to the different orographic locations and including wide ranges of line heights, shielding angles, and insulation levels are given