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

Abstract

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

Statistical analysis on measured lightning overvoltage surges in a 110 kV air‐insulated substation

“…The upper bound is described as line C, whereas the lower bound is line A. Lines A and C are expressed by (11) and (12), respectively. The regression line, namely line B, is expressed as (13), and can roughly reflect the mathematic relation between the front time and tail time that both belong to the same lightning waveform Line A: ln y A = (0.5472 ln x + 3.626) − 1.5 (11) Line C: ln y C = (0.5472 ln x + 3.626) + 1.5 (12) Line B: ln y B = (0.5472 ln x + 3.626)…”

“…Hence, obtaining the statistical characteristics of waveform parameters for intrusive lightning overvoltage in the field is necessary. Only few detailed studies have been conducted on the statistics of characteristic parameters of the intrusive lightning impulse voltage on transformers, even though some statistical research on the direct lightning overvoltage has obtained measurements from the devices installed on the transmission lines [11,12]. The measured waveforms are characterised depending on the measurement positions.…”