Lightning protection guide by OBO

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Last revision 2020

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

Strana 131 z 288

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2 Insulated external lightning protection sys- tem with insulators An insulator should keep conductors routing lightning current distance from metallic structures and elec- trical systems, provide insulation against the induced voltage case lightning strike and resist the en- vironmental loads, such ultraviolet radiation and soiling, and the tension and pressure forces resulting from snow, ice and wind. However, insulators are a part mechanically coupled system made in- sulating materials and ladders. kx leff/lst Effective length correction factor leff Strike distance air spark gap with equivalent discharge behaviour insulator.2.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 2. lst Thread measure the insulator Further type tests are described IEC 62561-8 and contain the following points: • Documentation • Labelling • Construction • Ultraviolet light • Corrosion • Extraction force • Bend test • Impact test • Electrical testing The following applies for the calcu- lation the separation distance according IEC/EN 62305-3: km = kx. specifies the ratio the standing lightning pulse voltages air spark gap and in- sulator aged radiation. The separation distance defined DIN EN 62305-3 (IEC 62305-3) and contains the coeffi- cient km.13. Stand Insulator Metal bracket Air-termination system/conductor Insulated holder lst Thread measure the insulator Definition thread measure the insulator TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 131 Chapter The external lightning protection system . The most important requirement the compliance of the necessary separation distance, even the insulat- or moved. Instead km, the manufacturer states the ef- fective length correction factor kx, which confirmed in type test