Lightning protection guide by OBO

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Last revision 2020

Vydal: OBO BETTERMANN s. r. o. Autor: OBO BETTERMANN

Strana 133 z 288

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The two conduction layers compensate for uneven- nesses, thus ensuring even field distribution. Lightning current, several kA Connections between copper cable and sheath Electrical connection building, conductive structure, local PAS Minimum spacing (smaller values are possible based on calculation) Function the isCon® conductor TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 133 Chapter The external lightning protection system . turn, this voltage requires the maintenance separation distance between the shield and the system protected. Here, manner similar medium and high-voltage cables, the internal conductor surrounded with a weakly conductive internal conduction layer, which the actual insulating material attached. The weakly conductive layer attached this insulating material. This avoids the formation damaging floating discharges through the appropriate control the electrical field strength the critical area the transition the air- termination system. contrast the medium and high- voltage network, the inductive coupling, created the lightning impulse current, induces very high voltage onto the cable shield. Undershooting this separation distance would lead arcing and to the coupling high impulse current into the sys- tems protected [Beierl]. resistive field control has shown itself particularly suitable and robust.TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 Thus, measures avoid floating discharges can be selected without taking thermal effects alternating current into account. However, the metallic shield used for medium and high-voltage cables technically undesirable for insu- lated conductors