TB3202007CharacterisationofELFMagneticFields

320CHARACTERISATIONOFELFMAGNETICFIELDSTaskForceC4.205April2007CHARACTERISATIONOFELFMAGNETICFIELDSTaskForceC4.205MembersoftheTF:JeanHoeffelman(Convener)–BelgiumRenatoConti-ItalyPedroL.CruzRomero–SpainFrançoisDeschamps–FranceThanDovan-AustraliaDanielGoulet–CanadaTommiKeikko–FinlandKeesKoreman–NetherlandYukioMizuno–JapanDavidRenew–UnitedKingdomEnerSalinas–SwedenHectorLeopoldoSoibelzon–ArgentinaPauliVanhala-FinlandPaulWong-CanadaHiroyukiYomori–JapanJunYoshinaga–JapanContributionswerealsoreceivedfrom:BredaCestnik(Slovenia),NgChongKiat(Canada),DorinCristescu(Romania),GabrielleCrotti(Italy),JarmoElovaara(Finland),PeterLigtvoet(Netherland),GaryMelik(Australia),W.H.Siew(UnitedKingdom),MauroZucca(Italy)Copyright©2007“OwnershipofaCIGREpublication,whetherinpaperformoronelectronicsupportonlyinfersrightofuseforpersonalpurposes.Areprohibited,exceptifexplicitlyagreedbyCIGRE,totalorpartialreproductionofthepublicationforuseotherthanpersonalandtransfertoathirdparty;hencecirculationonanyintranetorothercompanynetworkisforbidden”.Disclaimernotice“CIGREgivesnowarrantyorassuranceaboutthecontentsofthispublication,nordoesitacceptanyresponsibility,astotheaccuracyorexhaustivenessoftheinformation.Allimpliedwarrantiesandconditionsareexcludedtothemaximumextentpermittedbylaw”.N°ISBN:978-2-85873-004-9p.2/45IndexEXECUTIVESUMMARY.........................................................................................................................................31INTRODUCTION.........................................................................................................................................52SCOPE...........................................................................................................................................................53BASICCONCEPTS......................................................................................................................................63.1DEFINITIONS...............................................................................................................................................63.2QUANTITIESANDCONSTANTS.....................................................................................................................83.3FIELDCALCULATION...................................................................................................................................93.4HVERSUSB..............................................................................................................................................103.5FIELDPOLARIZATION................................................................................................................................11Example........................................................................................................................................................134DEFINITIONANDDESCRIPTIONOFTHEQUANTIFICATIONPARAMETERS.......................144.1FIELDVARIATIONS....................................................................................................................................144.1.1Variationsofthefieldintime(temporalvariations)........................................................................144.1.2Variationsofthefieldinspace(spatialvariations).........................................................................144.2INSTANTANEOUSVALUESOFTHEFIELDSTRENGTH...................................................................................144.2.1RMSvalue(Rootmeansquare).......................................................................................................154.2.2Resultantfield:(Br).........................................................................................................................164.2.3Peakvalueoffieldstrength:(Bpeak).................................................................................................184.2.4Measuredversuscalculatedvalues..................................................................................................184.2.5Comments........................................................................................................................................194.3STATISTICALVALUES(TIMEANDSPACEVARIATIONS).............................................................................204.3.1Arithmeticmeanvalueintime.........................................................................................................204.3.2Median.............................................................................................................................................234.3.3Valuenotexceededduringagivenpercentageoftime....................................................................244.3.4Arithmeticmeanvalueinspace.......................................................................................................264.3.5Arithmeticmeanvalueinspaceandtime........................................................................................264.3.6Geometricmeanvalueinthespaceandinthetime..............