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1、Harlow,JamesH.“Transformers”TheElectricPowerEngineeringHandbookEd.L.L.GrigsbyBocaRaton:CRCPressLLC,2001©2001CRCPressLLCCombinationMeteringUnitsThelastmajorassemblyisthemeteringunit,whichconsistsofVTandCTelementsinsinglephaseorthreephasearrangements.Meter-ingunitscanbes
2、inglemoldedelementsmountedonastructurethatisboltedtoautilitypole,orinapad-mountcompartment.Theelementscanbeinanycombinationneededtoprovideaccurateenergymeasurement.Meteringunitsarealsoavailableinthree-phasetankswiththeele-mentssubmergedinoil.Inhighvoltagesystems,asingl
3、e-phasecom-binationCT/VTunitisavailablethatlooksmuchlikeahighvoltageCT.TheVTelementisL-GandiscommontotheH1terminal.Theelementsareindependentofeachother.TheCTelementismountedontopandcanhouseseveralcores,whichcanbeusedformeteringandrelayingapplications.TheVTelementisloca
4、tedinthebottom.Whenmeasuringenergyusageforthepurposesofrevenuebilling,3-Phasemeteringunit.(CourtesyofandknowingtheRCFandphaseanglereadingsofeachelement,youKuhlmanElectricCorp.)cancorrectthewattsorwatthoursbymultiplyingthereadingbytheproductof[TCFCT][TCFVT].NewHorizonsW
5、ithde-regulationoftheutilityindustry,buyingandsellingofpower,leasingpowerlines,etc.,theneedformonitoringpoweratthetransmissionanddistributionlevelwillincrease.Therewillbeaneedtoaddmoremeteringpointswithinexistingsystemsstartingatthegenerator.Theutilitieswillwanttoaddth
6、isfeatureatthemosteconomicalcost.Theuseofwindow-typeslipoverCTsforrevenuemeteringwilldrivetheindustrytowardsimprovedperformance.Theneedforhigheraccuraciesatalllevelswillbedesired,andcanbeobtainedeasilywiththeuseoflowburdensolid-statedevices.Productswillbecomemoreenviro
7、nmentallysafeandsmallerinsize.Tohelpthetransformerindustryfulfilltheseneeds,steelproducerswillneedtomakeimprovementsbyloweringlosses,increasinginitialpermeability,anddevelopingnewcomposites.ReferencesBurke,H.E.HandbookofMagneticPhenomena.NewYork:VanNostrandReinholdCo.,1
8、986.Cosse,R.E.Jr.etal.,Eds.Thepracticeofgrounddifferentialrelaying.I.A.S.Trans.30,1472-1479,1994.Funk,D.G.andBeaty,H.
