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Comment se protéger de ses effets destructeurs ? Peut-on la maîtriser et récupérer son énergie ? À quoi sert-elle sur notre planète et où frappe-t-elle de préférence ? Faut-il en avoir peur ?. La foudre est un phénomène naturel qui fascine de tout temps, petits ou grands. Si son caractère mystérieux est de mieux en mieux connu, il n’est pas toujours bien expliqué, ni compris, et il alimente encore un nombre considérable d’idées reçues. Cette seconde édition reprend le même objectif que la première : apporter des réponses claires et détaillées, afin de permettre à tout un chacun de connaître et d’apprécier cet événement à la fois banal et spectaculaire. Une mise à jour des nouvelles connaissances et actions en matière de protection vient compléter ce panorama. La foudre est probablement à l’origine de la vie sur notre Terre : sachons lui rendre hommage !

Lightning protection.

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When it comes to dealing with high voltages or issues of high electric currents, infrastructure security and people’s safety are of paramount importance. These kinds of phenomena have dangerous consequences, therefore studies concerning the effects of lightning are crucial. The normal operation of transmission and distribution systems is greatly affected by lightning, which is one of the major causes of power interruptions: direct or nearby indirect strikes can cause flashovers in overhead transmission and distribution lines, resulting in over voltages on the line conductors. Contributions to this Special Issue have mainly focused on modelling lightning activity, investigating physical causes, and discussing and testing mathematical models for the electromagnetic fields associated with lighting phenomena. In this framework, two main topics have emerged: 1) the interaction between lightning phenomena and electrical infrastructures, such as wind turbines and overhead lines; and 2) the computation of lightning electromagnetic fields in the case of particular configuration, considering a negatively charged artificial thunderstorm or considering a complex terrain with arbitrary topography

lightning --- lightning protection system --- wind turbine blades --- ANSYS workbench --- graphics processing unit (GPU) --- OpenACC (open accelerators) --- finite difference time domain (FDTD) --- lightning magnetic fields --- electromagnetic field --- analytical formula --- corona discharge --- lightning protection --- electromagnetic pulse --- lightning-induced voltages --- numerical codes --- distribution lines --- lightning-induced overvoltages --- grounding modeling --- soil resistivity --- artificial thunderstorm cell --- upward streamer discharges --- electromagnetic radiation spectrum --- wavelet --- transmission line monitoring system --- model element --- simulation --- corona --- lightning surge --- overhead line --- transient calculation --- n/a