Lightning Investigation on the 220-Kv. System of the Pennsylvania Power & Light Company (1930)

This paper describes the 1930 results (fifth consecutive year) of a lightning investigation conducted on 220-kv. lines located in eastern Pennsylvania and where lightning storms are prevalent. During 1930 the investigation was expanded; two new devices, the surge (insulator assembly flashover) indicator and the lightning (storm) severity meter being successfully applied. Unique and comprehensive data were secured on the magnitudes and wave shapes of natural lightning surges both at and remote from the point of origin on the transmission line; numbers of phases faulted during trip-outs; numbers, magnitudes and effects of direct lightning strokes; some data on the relative importance of induced strokes; results of measurements of atmospheric voltage gradients; and the indicated effect of overhead ground wires and tower footing resistances.