Lightning protection guide by OBO

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Last revision 2020

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

Strana 147 z 288

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labelling EX ISG 350 5240031 ATEX Ex IIC Gb Ex IIIC T80 Db EX ISG 5240030 EX ISG 350 5240033 OBO spark gaps As soon the ISG responds and conducts, the lightning current Iimp 100 run the earth along defined route. Interfering earth cur- rents close parallel high-voltage routes can, for ex- ample, induce permanent voltages into the pipeline segments. This arresting operation only takes few microseconds. The ISG low maintenance, it is designed for wide range arresting operations. Here, DVGW 24 recommends: 250 Hz. Class insulating flanges have testing AC voltage UPW and class insulating flanges of 2.V. Flanges and insulating pieces show relatively low voltage resistance, which usually the range a few kV. Class insulating flanges have approx.5 kV. The AfK recommendation no. This safety-relevant re- quirement fulfilled the OBO spark gap. Product characteristics the spark gap ISG H The ISG implements state-of-the-art technologies and innovations: • Solvent-free, environmentally friendly material • Modern machining technology from the automotive sector • Chemical resistance • Resistance oils and extreme temperature vari- ations • Halogen-free • UV-stable, weatherproof • Ignition protection type/device protection level: Pressure-resistant encapsulation/"db" for gases, protection through housing/"td" for dusts • Resistant salt water • Highest testing Class accordance with IEC 62561-3 • Tested connection technology Class according to IEC 62561-1 • Suitable for all explosion groups and use Ex zones 1/21 and 2/22 TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 147 Chapter The external lightning protection system .5 x UPW.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 Selection spark gaps potentially explosive areas Spark gaps Item no. Here, the maximum voltage drop should smaller than the peak values of the testing voltage ÛPW. Thus, the OBO spark gap, with Urimp ≤ 1.25 kV, fulfils the requirements for all insulating flange classes according IEC 62561-3. Besides the response range, the ISG has a defined lower blocking range. working group (German Technical and Scientific Asso- ciation for Gas and Water) explains the coordinated use spark gaps insulating flanges using ex- amples and detailed calculations. The same requirements are made the European recommenda- tion Ceocor (European Committee for the study of corrosion and protection pipes and pipeline sys- tems). When the spark gap has ignited, the pulse current causes voltage drop via the connection cables and the spark gap, whereby the connection techno- logy has the greatest influence. doing, the technical rules of DVGW require selection the response surge voltage Uas the spark gaps such way 0. prevent the ISG from ignit- ing every time and, consequence, influencing the KKS system (cathodic corrosion protection system) ‒ a so-called withstand voltage UWAC is defined and must maintained. the peak value. After the arresting op- eration, the ISG returns standard, high-res- istance state. the DVGB e