Lightning protection guide by OBO

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Last revision 2020

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

Strana 223 z 288

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with lightning current, can assumed that the frequency will be high and the pulse duration short. electrical conductor formed into loop and placed vari- able magnetic field, voltage (U) can measured at the ends the conductor. A shield the communication cable can considerably reduce the magnitude the interference induced.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 This induces surge voltage that can disrupt dam- age connected electrical devices. The energy level is lower than the case the 10/350 pulse. The magnitude the in- duced voltage varies depending the size the magnetic field and the conductor loop inside the magnetic field. Data cable Energy cable Power Frequency Time Inductive coupling from parallel power cable Current-carrying conductor Conductor loop with voltage U Variable magnetic field Induction surface Induction conductor loop TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 223 Chapter The internal lightning protection system . The induced surge voltages have the waveform 8/20 μs. The magnitude the interfer- ence voltage induced the communication cable de- pends both the conductor the magnetic field, and the structure the communication cable. For example, 230 power lines: If the communication cable located inside the mag- netic field electrical conductor, interference voltage can induced. Basic principle induction: Current (I) flowing through electrical conductor generates magnetic field all around it. However, not only lightning current that can in- duce interference voltages; any electrical cable carry- ing current can this. data cable, this often results the destruction the sensitive elec- tronic components connected it