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1、BS7430:2011+A1:2015BSIStandardsPublicationCodeofpracticeforprotectiveearthingofelectricalinstallations--``,`,`,`,,,,`,,,,,,,`,,`,,```,-`-`,,`,,`,`,,`---www.TeraStandard.comBS7430:2011+A1:2015BRITISHSTANDARDPublishingandcopyrightinformationTheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthed
2、ocumentwaslastissued.©TheBritishStandardsInstitution2015PublishedbyBSIStandardsLimited2015ISBN9780580900075ICS13.260;29.240.01ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceGEL/600Draftsforcomment11/30249994DC,15/30322343DCPublicationhistoryFirstpublishedasCP1013:1965Firstp
3、ublishedasBS7430,January1992Secondedition,November1998Third(present)edition,December2011AmendmentsissuedsincepublicationDateTextaffectedAugust2015A1-SeeForeword--``,`,`,`,,,,`,,,,,,,`,,`,,```,-`-`,,`,,`,`,,`---www.TeraStandard.comBRITISHSTANDARDBS7430:2011+A1:2015ContentsForewordiii1Scope12Normative
4、references13Termsanddefinitions44Earthingprinciples55HV/LVinterface126Lowvoltageinstallations127Generators198Specialinstallations299Earthelectrodesystems3310Inspectionandtestingoftheearthingsystem67AnnexesAnnexA(informative)GuidanceontypicalHV/LVinterfaces80AnnexB(informative)Typicalsimpleinstallati
5、onofanearthingsystemforasmallLVsubstation86Bibliography89ListoffiguresFigure1TN-Ssystem7Figure2TN-Csystem8Figure3TN-C-Ssystem9Figure4TTsystem10Figure5ITsystem11Figure6Earthingarrangementandprotectiveconductorsforconsumersinstallations15Figure7Smalllowvoltagesinglephasegeneratorrunasafloatingsystem20
6、Figure8Smalllowvoltagegeneratorsupplyingafixedinstallation21Figure9Smallunearthedgeneratorsupplyingamobileortransportableunit22Figure10Lowvoltagestandbygeneratorswithstar-pointswitching25Figure11Lowvoltagestandbygeneratorswithneutralearthingtransformers26Figure12Singlelowvoltagestandbygenerator(with
7、outparallelingfacility)27Figure13Measurementofearthresistivity36Figure14Impedancetoearthofhorizontalearthelectrodesburiedinhomogeneoussoil37Figure14aEffectofinterelectrodespacingoncombinedresistance39
