Lightning protection guide by OBO

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Last revision 2020

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

Strana 15 z 288

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3 Sources and causes damage according standards For the purposes the risk analysis according to IEC/EN 62305-2, lightning strikes are assigned one of four possible “sources damage” (S1-S4). the case small surges, the other hand, failures often occur only after time delay they accelerate the aging process the components the affected devices, causing them insidious damage. Circuit board destroyed surge 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 15 Chapter General introduction .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 1.2. switching operations involving large inductive loads such motors.1 Transient surges Transient surges are voltage increases lasting for a matter microseconds but whose magnitude sev- eral times that the mains voltage. Induced surge voltages Induced voltage peaks building installations and en- ergy data supply cables can also reach many times the nominal operating voltage and cause the immedi- ate failure the systems.2.2. When direct strike hits the external lightning protec- tion system low-voltage exposed cable, this usu- ally causes without internal lightning and surge pro- tection damage the insulation and total outage of the connected consumers.3 Effects surges Energy-rich lightning currents often cause the instant- aneous destruction unprotected systems. Lightning surges can sometimes reach 100 times the nominal voltage value and contain high energy content. 1. rule, switching surges amount to twice three times the operating voltage.2 Lightning surges The largest voltage peaks the low-voltage consumer network are caused lightning discharges. The damage/loss then categorised according four different types damage (L1-L4).2. 1. number of different protection measures are required. Permanent surges caused impermissible conditions the mains network are not considered transient surges.g.2. Switching surges Switching surges can arise from various sources, e. Lightning surges can sometimes reach 100 times the nominal voltage value and transport high energy content. light- ning strike can lead three possible sources dam- age (D1-D3). 1. These de- pend the exact cause and/or impact point the lightning discharge.2