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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Instead km, the manufacturer states the ef- fective length correction factor kx, which confirmed in type test.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. 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. The most important requirement the compliance of the necessary separation distance, even the insulat- or moved.2.13. The separation distance defined DIN EN 62305-3 (IEC 62305-3) and contains the coeffi- cient km. specifies the ratio the standing lightning pulse voltages air spark gap and in- sulator aged radiation. 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 . kx leff/lst Effective length correction factor leff Strike distance air spark gap with equivalent discharge behaviour 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 2. However, insulators are a part mechanically coupled system made in- sulating materials and ladders