An eight-year investigation of lightning currents and preventive lightning protection on a transmission system

G. D. McCann (Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa.): The data reported in this paper are of great value in furthering our knowledge of lightning phenomena, particularly because of the thoroughness with which the investigation has been conducted. The installation of surge-crest-ammeter links on every tower of the lines studied has enabled the determination of the density of strokes to the lines and the variation of this with time and location. This is one of the most fundamental factors in the lightning performance of transmission lines for which little information has been available from any other source.