Lightning protection guide by OBO

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Last revision 2020

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

Strana 134 z 288

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The voltage load lightning strike impulse voltage. Current density vectors resistive field control and po- tential density insulated conductor time 1.2. The lower the resistance designed be, the more effective it is. potential 1,000 is applied the internal conductor. For this, the test- ing arrangement used basis, which also used for the high-voltage testing according IEC TS 62561-8 and represents the worst-case scenario. The value limited downward direction that no partial lightning current can flow into the building. TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 134 Chapter The external lightning protection system . Within the external conductive layer and the resistive field control layer, the current lines can seen, which are significant for avoiding floating discharges. an induced voltage only present insulated con- ductor when lightning strikes, resistive field control can used avoid floating discharges.2. Both diagrams show how the nu- merical, time-discreet field calculation can used to optimise the resistive field control that the current in the field control layer can kept small pos- sible, whilst still avoiding the formation floating dis- charges. Using the numerical field calculation, the res- istive field controller can calculated time-dis- creet manner for the entire course the impulse voltage. In upward direction, the value given the re- quirement for effective field control.2 µs the applied impulse voltage 1.2/50. The right-hand image uses cross-sec- tion diagram show the current density vectors and equipotential areas.2 the applied impulse voltage 1.4 Potential control For safe operation insulated conductor, meas- ures avoid floating discharges are necessary. Field diagram insulated conductor the first equi- potential bonding terminal during type test time = 1.13. This allows optimisation the resistance value the resistive field controller. Here, equipotential lines and the vertical electrical field lines can seen.2/50 below the earthed fastening clamp. As an example, the left image shows the field diagram of this arrangement with applied impulse voltage of 1,000 the area the equipotential bonding ter- minal