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1、1LightningprotectiongroundingAbstractThesignificanceoflightningp.rotectionmitigationonverylittlemoneytopreventlargelossesitsfunctionistousescientificmeansavoidnaturaldisasters.Groundingistomakethesystemhasbeenincludedint

2、helightningprotectionlightningenergydisgeintotheearthgoodgroundingcaneffectivelyreducetheonlineguideovervoltageavoidcounterattack.Avoidgroundisthemostimptantaspectoftechnologywhethersingsreminductionlightningotherfmsofra

3、yultimatelythelightningcurrentintotheearth.Therefenoreasonablegoodgroundingdeviceiscantreliablythelightningstrikes.Thesmallerthegroundingresistancecomelooseflowisquickerlightningobjectsthetimetomaintainhighpotentialmesht

4、thelessriskKeyWds:LightningprotectionGroundingCurrentpotential1introductionInrecentyearsmanydomesticfeignstardsdonotadvocateinfmationequipmentusingindependentgroundingdevicerecommendtheuseofcommonearthingsystem.Fexamplet

5、he2000editionoftheGB5005794“designcodefprotectionofstructures“inpointoutclearly:“everybuildingitselfshouldadoptcommonearthingsystem“tobethebuildingswithinthevariousgroundingareunifiedtobuildingsbasedonoutdogroundingdevic

6、e.Whenthebuildingwashitbylightningpowersystemvoltageelectricalequipmentgroundingvoltagerisesatthesametimekeeptheequipmentwkingvoltageconstantsothattheelectronicequipmentfromlightningstrikescanwknmally.Commonearthingsyste

7、musuallyusethebuildingfoundationgroundingelectrodethegroundingresistancelessthan1ohmingeneraliftheequipmentgroundingresistancerequirementislowershouldtaketheminimumvalue.Thegroundthathasbeenincpatedintothelightningprotec

8、tionsystemoflightningenergydrainintotheearthgoodgroundingdownleadtoeffectivelyreducethevoltageonthebacktoavoidtheoccurrenceof.Inthepastsomerequirementsofelectronicequipmentgroundingalonethepurposeistopreventstraycurrentt

9、ransientcurrentinpowerwkdisturbanceofthenmalwkofequipment.Befe90timefcesofthecommunicationnavigationequipmentelectronictubedeviceusinganalogcommunicationmodeanalogcommunicationonparticularlysensitivetointerferenceinterfe

10、rencesowilltakepowercommunicationsgroundingseparateway.Nowthelightningprotectionengineeringfieldsdonotadvocateaseparateground.IntheIECstardsITUstardsarenotadvocatingaseparategroundAmericanStardIEEEStd11001992mesharplypoi

11、ntedout:notrecommendedtheuseofanykindofsocalledseparateindependent3IntheusualconstructioninfactthegroundingofPLCwayadoptsthesecondgroundingwaysasfelectromagicinterference:ifthecabiisprovidedwithapluralityofhighpowerfrequ

12、encyconvertercanbeinthePLCpowersupplyisinstalledinfrontofasinglephasepowerfiltercanbegenerallydesignedintheinverterPLCnearthefrontendareequippedwithpowersupplyfilter.TheinterferenceeffectofDCACequipmentcanbeconnectedtoge

13、thereveniftheDCACcircuitsbecauseofsomereasonconnectivitybecausetheyarenotthesameasaloop(groundingisnotpartoftheloop)willnotcausedamagetotheequipment.PeoplehaveAC220VpowerDC24Vcircuitconnectedtoitbuttheequipmentwkremainsn

14、mal.Digitalanaloggroundsuggestedseparately(unlessyourealowvoltageelectricalequipmentpowersupplyvoltageonlyafewtensofvolts)becausethedigitalcircuitbelongstopositivenegative5V12V24Vlevelarevulnerabletointerferenceoncetheex

15、ternalabnmalvoltageoncetheserieswillverypossibleequipmentdamage.Ijustgotowkinthefactyhasa1000tonsofSACMIpressbecauseotherequipmentdigitalgroundcausestheelectronicfacilitiesburneddownlastseveraltimesItalysenttechnicians(j

16、ustgraduatedfromsecondaryschoolstudents)replacementequipmentconductoftheinsitudugapitburiedapieceofgroundthebrasstheearthingfillerengageinaseparategrounding.3Lightningproofgroundingdevicefpartofaconcept(1)Lightningreceiv

17、ingdevicedirectlyindirectlyacceptthelightningrod(flash)suchaslightninglightningprotectionzone()overheadgroundwirearrester.(2)lead:fthelightningcurrentfromthelightningarresterisconductedtothegroundingconduct.(3)grounding:

18、electricalequipmenttowergroundingterminalagroundingbodythezerolineconnectedwiththenmallynotcurrentcarryingmetalconduct.(4)groundingbody(polar):buriedinthesoildirectlytouchtheearthmetalconductknownasthegroundingbody.Divid

19、edintoverticalgroundingelectrodelevelofgroundingbody.(5):groundingdevicegroundinggrounding.(6):groundinggridbyverticalhizontalgroundingbodycompositionhavingdisgepressureequalizingfunctionwkgroundingdevice.(7):groundingre

20、sistanceofgroundingbodynaturalgroundingresistancetothegroundofthesumagroundingdeviceresistanceitsvalueisequaltothegroundingdeviceofvoltagetothegroundthroughthegroundingbodyintogroundcurrentratio.Atthesametimethegrounding

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