Lightning investigation on a 220-kv system

Investigation of the effects of lightning discharges on the 220-kv transmission lines of the Pennsylvania Power and Light Company has been continued over a period of several years; results obtained during the period 1931–33 are reported and analyzed in this paper. By the use of the “distribution ratio method” of locating faults nearly all 220-kv faults causing line trip-outs were found quickly and positively correlated with time, dynamic current, lightning current, insulator flashovers, line construction, and tower footing resistance.