Lightning protection guide by OBO

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Last revision 2020

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

Strana 12 z 288

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5 and kV/m.3 Charge dispersion Studies have proved that the sleet falling down (area warmer than –15 °C) has negative charge and the ice crystals being thrown upwards (area colder than –15 °C) have positive charge.1. The light ice crystals are carried into the upper areas the cloud the up-wind and the sleet falls the central areas the cloud. • The field strength required trigger lightning de- pendent the insulation ability the air and is between 0.1. • The area near the ground also has positive charge. Typical charge distribution: • Positive the upper part, negative the middle part, and weakly positive the lower part.Charge distribution cloud 1. 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 12 Chapter General introduction