Lightning phenomena: III — Field studies

In this concluding article in a series of three, field studies of lightning disturbances on electric-power systems, made with the aid of instruments described in part II (September issue), are reviewed. (Part I, in the August issue, reviewed the general characteristics of lightning phenomena.) The qualitative and quantitative information obtained in these studies has enabled remedial measures to be devised and the lightning performance of systems improved, thereby reducing the system outages from this cause. FROM the standpoint of the lightning performance of electrical systems the frequency of occurrence, as well as the magnitude and wave shape of the voltages and currents produced on systems, is important.