A study of lightning phenomena on distribution lines based on a lightning‐surge analysis model for direct lightning strokes

Abstract

SUMMARYIn order to rationalize the lightning protection design of distribution lines, lightning phenomena on TEPCO's distribution lines were continuously observed. The observations were carried out with still cameras and lightning surge monitoring sensors. The results elucidate the lightning performance of distribution lines. For example, direct lightning strokes are the major cause of the present distribution line faults. This fact suggests that it is important to investigate observation data on direct lightning strokes. The observation data were analyzed by means of a direct lightning analysis model. The calculated waveforms were compared with the measured waveforms on distribution lines. The probability distributions of the surge currents and voltages were calculated by the Monte Carlo method. These results provide new data on lightning performance.

Effect of Grounding Resistance Connected to Surge Arresters in Power Distribution Lines on Lightning Surge Behavior Observed in Customer's Equipment

“…The characteristics of the surge Arr are modeled via a gap-type nonlinear resistor (inception voltage: 29 kV) [17]. In the case without GW, sparkover (below referred to as SO) through pole reinforcing bars and the Arr GW is simulated by a switch with a set voltage of 60 kV [10].…”