Lightning protection guide by OBO

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Last revision 2020

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

Strana 238 z 288

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The maximum operating current should also be verified ensure that the dissipated energy does not cause thermal destruction the decoupling elements. These devices can universally applied. Basic protection circuit measuring circuit Use lightning barriers measuring circuits Before lightning barriers are used measuring cir- cuits, must first confirmed whether resistance increase permitted.Circuit diagram lightning barrier FRD/FLD Circuit diagram lightning barrier FRD2/FLD2 Type series FRD/FLD Type FRD, FLD and MDP lightning barriers are de- signed for use so-called floating (asymmetrical, po- tential-free) two-core systems. Depending the decoupling, resistance increases the measuring circuits can oc- cur with types FRD and FRD2. FLD/FLD2 an- d/or MDP devices should therefore used this case.g. current loops. These are systems whose signal circuits have common reference po- tential with other signal circuits, e. Therefore, when used measuring cir- cuits with high transfer frequencies, lightning barriers with resistive decoupling elements are the preferred solution. In the case arrestors with integrated inductances for decoupling, the signal attenuated high transfer frequencies. This can result er- rors with current loop measurements. Type series FRD2/FLD2 Type FRD2 and FLD2 are intended for use ground- referenced (symmetrical, potential-referenced) single- wire systems. TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 238 Chapter The internal lightning protection system . Ground-referenced systems are signal circuits that have common reference potential with other signal circuits. these systems, two further data cables be- sides earth are protected. The decision use FRD (with resistive decoupling) FLD (with inductive de- coupling) depends the system protected