OTOWA Global Catalog | OTOWA ELECTRIC CO., LTD.

>> P.9

EquipmentSPDbetweenearthsEquipotentialBondingElectricequipmentCommunicationSignallineSPD(Lightningarrestor)LightningcurrentPowerlineProtectionagainstlightningGeneralprinciplesIEC62305-1Lightningprotectionriskmanagement1Constructionandrelationoflightningprotectionstandard(IEC62305)2Regulationofcommonitemsoflightningprotectionrelations3Deningthelightningcurrentparameter4Thedamageofthelightning5Theriskoflightningandthenecessityoftheprotection6Kindandchoosingoflightningprotectioncountermeasure7BasicstandardforlightningprotectioncountermeasureElectricPotentialPowerlineBerelatedeachotherEarth-terminationsystemLightningequipotentialbondingAir-terminationsystemDown-conductorsystemEarth-terminationsystemLightningequipotentialbondingExternalLPSisolatedfromthestructuretobeprotectedLightningprotectionzone(LPZ)MagneticshieldandwiringrouteGroundingandlightningequipotentialbondingProtectiondesignbypowerlineSPD(Countermeasureforlow-voltageandhigh-voltagecircuitsystem)ProtectiondesignbycommunicationlineSPD(Countermeasureforcommunicationandsignallinecircuit)ProtectionagainstlightningExternallightningprotectionsystemPhysicaldamagetostructuresandlifehazardIEC62305-3InternallightningprotectionsystemReducingdesignforlightningsurge(ReducingofLEMP)ProtectionagainstlightningElectricalandelectronicsystemswithinstructuresIEC62305-4ReducingofsurgebySPD(Reducingofovervoltage)StandardsforSPDIEC61643-11,-12IEC61643-21,-22ComprehensivelightningprotectionsystemThefunctionofalightningprotectionsystemistoprotectstructures’fromfireormechanicaldestructionandpersonsinthebuildingsfrominjuryorevendeath.Alightningprotectionsystemconsistsofanexternalandaninternallightningprotectionsystem.Thefunctionsoftheexternallightningprotectionsystemare:Tointerceptdirectlightningstrikesviaanair-terminalsystemTosafelyconductthelightningcurrenttothegroundviaadown-conductorsystemTodistributethelightningcurrentinthegroundviaanearth-terminationsystemThefunctionoftheinternallightningprotectionsystemsis:Topreventdangeroussparkinginsidethestructure.Thisisachievedbyestablishingequipotentialbondingormaintainingaseparationdistancebetweenthecomponentsofthelightningprotectionsystemandotherelectricallyconductiveelementsinsidethestructure.Lightningequipotentialbondingreducesthepotentialdifferencescausedbylightningcurrents.Thisisachievedbyconnectingallisolatedconductivepartsoftheinstallationdirectlybymeansofconductorsorsurgeprotectivedevices(SPDs).ThefourclassesofLPSl,ll,lllandlVaredeterminedusingasetofconstructionrulesincludingdimensioningrequirementswhicharebasedontherelevantlightningprotectionlevel.Eachsetcomprisesclass-dependent(e.g.radiusoftherollingsphere,meshsize)andclass-independent(e.g.cross-sections,materials)requirements.Toensurepermanentavailabilityofcomplexinformationtechnologysystemsevenincaseofadirectlightningstrike,additionalmeasures,whichsupplementthelightningprotectionmeasures,arerequiredtoprotectelectronicsystemsagainstsurges.Thesecomprehensivemeasuresaredescribed.9

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