Abridgment of lightning investigation on 220-kv. system of the Pennsylvania power & light company (1928 and 1929)

The purpose of this paper is to describe the results of a lightning investigation conducted during 1928 and 1929 on 114 circuit miles of a 220-kv. system located in a territory where severe lightning storms are frequent. During the 1929 investigation, which was a continuation and expansion of previous years´ work, a number of devices was successfully used, such as surge voltage recorders, cathode ray oscillographs, electric field intensity recorders, and lightning stroke recorders. Some of these devices are new. Many valuable data on magnitude and wave shape of actual lightning surges were obtained, proof of the existence of both single-and multiple-phase faults due to lightning; some data on the shielding effect of overhead ground wires, and qualitative data on the nature and lime of discharge of lightning strokes together with the atmospheric gradients resulting therefrom, were also obtained.