When assessing the lightning performance of distribution lines, major attention is in general devoted to the induced voltages from nearby strikes rather than to direct events hitting the line, as the latter are always expected to cause a fault in the line. This paper proposes a Monte Carlo procedure capable to make it possible the evaluation of the overvoltage probability due to both indirect and direct strokes. The results are presented making reference to specific nodes of medium voltage overhead distribution networks, namely the locations of MV/LV transformers connections. The problem is of interest when a major upgrade of surge arresters is required, for instance when the neutral grounding practice needs to be changed (e.g. from grounded to resonant).
Estimation of the influence of direct strokes on the lightning performance of overhead distribution lines / Tossani, F.; Napolitano, F.; Borghetti, A.; Nucci, C.A.; Lopes, G.P.; Martinez, M.L.B.; Dos Santos, G.J.G.. - ELETTRONICO. - (2015), pp. 7232682.1-7232682.7. (Intervento presentato al convegno IEEE Eindhoven PowerTech, PowerTech 2015 tenutosi a Eindhoven, Netherlands nel 2015) [10.1109/PTC.2015.7232682].
Estimation of the influence of direct strokes on the lightning performance of overhead distribution lines
TOSSANI, FABIO;NAPOLITANO, FABIO;BORGHETTI, ALBERTO;NUCCI, CARLO ALBERTO;
2015
Abstract
When assessing the lightning performance of distribution lines, major attention is in general devoted to the induced voltages from nearby strikes rather than to direct events hitting the line, as the latter are always expected to cause a fault in the line. This paper proposes a Monte Carlo procedure capable to make it possible the evaluation of the overvoltage probability due to both indirect and direct strokes. The results are presented making reference to specific nodes of medium voltage overhead distribution networks, namely the locations of MV/LV transformers connections. The problem is of interest when a major upgrade of surge arresters is required, for instance when the neutral grounding practice needs to be changed (e.g. from grounded to resonant).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
