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ProtectITMultifunctionProtectionandSwitchbayControlUnitREF542plusTableofContents1General(42Functions(82.1Configuration(82.2Operation(102.3Measurement(122.4Protection(132.5Control(142.6Eventrecording(142.7Faultrecording(152.8Realtimeclock(162.9Processinterface(163Diagnosisandmonitoring(194Analogoutput(205Communication(216Housing(237Mechanicaldesign(267.1REF542plusstandardcaseversion:(267.2REF542pluswidecaseversion:(267.3Analoginputs(268Listoftheprotectionfunctions(279Technicaldata(329.1Analoginputchannels(329.2Binaryinputsandoutputs(339.3Interfaces(349.4Analogoutputboard(optional(349.5Communication(optional(349.6Powersupply(359.7Environmentalconditions(359.8Degreeofprotectionbyenclosure(3610Typetest(3710.1Protectionfunction(3710.2Electromagneticcompatibility(3810.3Insulationresistance(4210.4Mechanicalrobustness(4210.5Climaticconditions(4211ConnectionDiagram(4311.1ConnectorPlate(4311.2HMIControlUnit(4411.3REF542pluswithmechanicalbinaryI/O(4511.4REF542pluswithsolidstatebinaryI/O(4811.5REF542pluswithmechanicalbinaryI/O(version2(5111.6Analoginputboardversions(521GeneralTheREF542plusMultifunctionProtectionandSwitchbayControlUnitisthefurtherdevelopmentoftheformerREF542unit.Likeitspredecessor,itfeaturesthefollowingfunctions:ProtectionMeasurementControlMonitoringAllfunctionsmentionedaboveandpowerqualityfunctionsareintegratedinaprogrammableenvironment.Theexceptionalflexibilityandscalabilityofthesenewgenerationdevicesleadtoasmartandcleansolutionwherethetraditionalapproachwouldbeineffectiveandexpensive.ThefollowingfiguresshowexamplesoftheREF542plusinstallationinseveralswitchboards.Figure1:REF542plusinstalledingasinsulatedswitchboards(GISFigure2:REF542plusinstalledinanairinsulatedswitchboard(AISTheREF542plusisbasedonareal-timemicroprocessorsystem.ThemeasurementandprotectionfunctionsareexecutedbyaDigitalSignalProcessor(DSP,whileaMicroController(MCisexecutingthecontrolfunctions.Duetothistaskseparationthereisnoimpactbetweenthestartandthetripbehavioroftheimplementedprotectionscheme,shouldthecontrolschemebemodified.TheCommunicationProcessor(CPisneededforconnectiontoastationautomationsystem.AblockdiagramoftheREF542plusisshowninfigure3.Figure3:REF542plusBlockdiagramREF542plus,asshowninfigure3,consistsoftwoparts,aCentralUnitandaseparateHumanMachineInterface(HMI.TheCentralUnitcontainsthepowersupply,processorandanalogandbinaryInputandOutput(I/Omodules,aswellasoptionalmodulesforsupplementaryfunctions.TheHMIControlUnitisastand-aloneunitwithitsownpowersupply.ItcanbeinstalledontheLowVoltage(LVcompartmentdoororinadedicatedcompartmentclosetotheCentralUnit.TheHMIisnormallyusedtosettheprotectionparametersandtolocallyoperatetheswitchingdevicesintheswitchbay.TheHMIisconnectedtotheCentralUnitbyashielded,isolatedtwistedpairaccordingtotheRS485interface.Figure4showsaninstallationoftheCentralUnitandtheHMIControlUnitintheLVcompartmentofaswitchboardfortheswitchbay.Figure4:MountingoftheCentralUnitintheLVcompartmentandtheHMIonthedoorTheHMIControlUnit,asshowninfigure5,featuresaback-illuminatedLiquidCrystalDisplay(LCD,eightpushbuttons,severalLEDsandanelectronickeyinterface.Thelanguageofthedisplaycanbeselectedviatherelatedconfigurationsoftwaretool,whichisalsousedtodefinetheprotectionandthecontrolscheme.Figure5:TheHMIControlUnitThelefthalfoftheLCDdisplayisreservedfortheSingleLinediagram.Therighthalfisusedtodisplaytheappropriatemenuorsubmenuasdeterminedbytheuser.Twodifferentelectronickeyswithdifferentaccessrightsareavailable.Eachofthekeysareprogrammedtopermiteither:protectionfunctionsparameterizationofthemodeselectionofthecontrolfunctionsThreefreelyprogrammableLEDbarshavebeenprovidedonthefrontoftheHMIControlUnit.EachLEDbarconsistsoftengreenandtworedLEDsandisuserconfigurabletodisplayanyrequiredmeasurementvalue.TheredLEDsareusedtoindicatevaluesabovetheratedvalue.ThefunctionsoftheREF542pluscanbetailoredtothesystemrequirementsviaauser-specificconfiguration.Theuser-specificconfigurationisloadedduringcommissioning.Forthatpurposetheconfigurationcomputer,normallyapersonalcomputer(notebookrunningWindowsNT,isconnectedtotheopticalinterfaceonthefrontsideoftheHMIControlUnit.TheinterfaceofthemultifunctionalunitREF542plustotheMediumVoltage(MVprimaryprocessisasfollows:AnaloginputstomeasurecurrentandvoltagesignalsfrominstrumenttransformersornonconventionalsensorsBinaryinputswithopticalcouplersforthegalvanicseparationoftheexternalsignalstobeprocessed;Binaryoutputswithconventionalmechanicalrelaysorstaticoutputsforthecontrolofswitchingdevices;Optionalfourchannelanalogoutputs0to20mAor4to20mAOptionalconnectiontoABBorthirdpartystationautomationsystem.REF542plusisacertifiedproductforcompliancetotheIndustrialITarchitectureconceptofABB.IndustrialITproductscanbeeffectivelycombinedtogetherintovalue-addedsystemsandsolutionsina“Plug&Produce”manner.Complianceaccordingto“Level0:Information”ensuresthatallrelevantproductdocumentation–includingtheoperationmanual,instructionsforinstallationandmaintenance,electricalandmechanicaldrawings,testreportsandspecificorderinformation-isonlineavailable,inelectronicformat,foraccessviasoftwareproductsandsystemsbasedontheABBAspectIntegratorPlatform.2FunctionsREF542plusMultifunctionProtectionandSwitchbayControlUnitintegratesallthesecondaryfunctionsinasingleunit.Thismultifunctionalunitalsofeaturesaself-monitoringfunction.Allfunctionsaredesignedasfreelyconfigurablesoftwaremodules.Therefore,awiderangeofoperationrequirementsinMVstationscanbemetwithoutanyproblems.TheversatilityofthesoftwaremakesitpossibletousetheREF542plusoneveryswitchboardindependentonthespecificapplicationrequired.2.1ConfigurationEachapplicationforprotectionandcontrolcaneasilybeconfiguredbysoftwarefunctionmodules,whichmakearbitrarydefinitionofthefollowingfeaturesaspartofthesecondarysystempossible:LED's(meaningandcolorsforlocalindicationSingleLinediagramtoshowthestatusofswitchingdevicesProtectionschemesControlschemesInterlockingschemesAutomationsequencesAllfunctionsintheswitchbaycanbespecifiedincollaborationwithABB.Theresultoftheconfigurationissavedanddeliveredtogetherwiththeswitchboardtotheusers.Byusingthe"FUnctionalblockProgrammingLanguage”(FUPLAtheREF542plusMultifunctionProtectionandSwitchbayControlUnitoffersengineers,especiallythosewhoarenotsoftwareexperts,theopportunityofeasilyupdatingtheoperationandhandlingoftheswitchbay.WithREF542plustheuserhasthebenefitofasecondarysystemthatisfullyintegratedinatrueprogrammablecontroller.Thisflexibilityisveryadvantageousfordefiningcontrolfunctionsforautomationsequences,whichcan,forexample,includetheinterlockingoftheswitchingdevices,blockingthereleaseofspecificprotectionfunctions,aswellasstartingswitchingsequences.REF542plusmultifunctionalunitprovidesawiderangeoflogicalfunctionssothateachrequiredcontrolschemescanbeconfigured.Therangeoflogicalfunctionsincludes:ANDlogicgateNANDlogicgateORlogicgateNORlogicgateXORlogicgateBistableandmonostableflipflopCountersTimersPulsegeneratorsMemoriesSimilartothefreedefinitionofthecontrolscheme,eachrequiredprotectionschemecanbeconfiguredbythecombinationoftheavailableprotectionfunctionmodules.Forexample,thefollowingprotectionfunctionsareavailable:DefinitetimeovercurrentprotectionInversetimeovercurrentprotectionDirectionalovercurrentprotectionUnder-orovervoltageprotectionDistanceprotectionDifferentialprotectionfortransformerandmotorThermalprotectionforcable,transformerandmotorReversepowerprotectionSynchronismcheckNoteThespecificsoftwareconfigurationoftherequiredprotectionschemecanonlybecarriedoutin-houseatABB.TheprotectionschemeparameterscanbechangedviatheHMIControlUnitwithoutusingapersonalcomputer.AdditionalfunctionscanbeexcutedwithapersonalcomputerrunningtheconfigurationsoftwareandconnectedtotheopticalinterfaceonthefrontoftheHMIunit.Theseadditionalfunctionsare:Parameterizationoftheprotectionscheme,Read-outofthecurrentmeasurementvalues,Read-outofthestatusofthebinaryinputsandoutputs,Read-outofthefaultrecorderandViewingoftheFUPLAlogicI/Ostates2.2OperationAwiderangeoffunctionscanbecontrolledandoperatedusingthesimple,user-friendlyinterfaceontheHMIControlUnit.Thisuser-friendlyinterfaceisshowninthefollowingfigure.Figure6:HMIasControlUnitTheHMIconsistsofthefollowingfeatures:Theback-illuminatedLCDdisplayoftheHMIprovidesagraphicaldisplayoftheswitchingdevicesintheswitchbaycontrolledbytheREF542plus.Theintensityandthedurationoftheilluminationcanbesetasrequired.TheSingleLinediagramshowsthecurrentstatusofalltheswitchingdevices.TherighthalfoftheLCDdisplayisforplaintext,suchasmeasurementvalues,mainmenuandsubmenusdescriptions,protectionsignalsandeventrecording.OntheLCDdisplay,thefollowingcanbeshown:Uptoeightswitchingdeviceicons(whenthebinaryI/Oboardswithmechanicalrelaysareused,amaximumofsevenswitchingdevicescanbecontrolledVariousiconsformotors,transformers,sensors,transducersAmaximumof40individuallines.FoursystemLEDs,describeinthefollowingchapters,indicatethestatusoftheREF542plus.OntheHMIfrontpanel,theoperationalstatusiscalled'Ready'andisdisplayedbyagreenLED.TheunitisnotoperationalwhenthisLEDisoff,andthisoccursforexampleduringthedownloadingoftheconfigurationfortheoperationoftheswitchbayorifafaultconditionisdetectedintheCentralUnit.OntheHMIfrontpanel,thiscommunicationstatusiscalled'NetworkCommunication'.IftheREF542plusistobeconnectedtoastationautomationsystem,theappropriatecommunicationsboardisrequired.InthiscaseagreenLEDisusedtoindicatethecorrectoperationalstatusofthisoptionalboard.TheLEDcolorchangestoredifacommunicationfailurehasoccurred.Severalarbitraryalarmconditionscanbedefinedandconfiguredbytheuser.Ifoneoftheseconditionsisfulfilled,theredLEDwillbeon.TheLEDisgreenifnointerlockingconditionshavebeenviolated.Incaseofaswitchingaction,whichviolatestheinterlockconditionssuchasswitchingadisconnectorintheclosedconditionoftheCircuitBreaker(CB,thecolorwillchangetemporarilytored.Eightfreelyprogrammable,threecolorLED'sareprovidedforlocalindication.ThenumberofLEDdisplayoptionscanbequadrupledthroughthemenustructure.Asaresult,atotalof32indicationoptionsareavailableforstatusindicationregardingprotection,control,monitoringandsupervisionfunctions.ThreefreelyprogrammableLEDbarsareprovidedforshowingthemeasurementvalues.TheLEDbarsareusedtodisplayarbitrarymeasurementvaluesasrequired.EachbarconsistsoftengreenandtworedLEDs.ThenominalvaluesofeachLEDbar,whichcorrespondstothetengreenLEDsaredefinedbytheconfigurationsoftware.Ifthemeasurementvaluesarehigherthantheratedvalues,theredLEDswillgetsilluminatedindicatinganoverloadsituation.Thecontrolpushbuttonsareusedforoperationoftheswitchingdevicesduringlocalcontrol.Atotalofeightpushbuttonsareavailable,fourforcommandingtheprimaryequipmentandfourforbrowsingthedisplay.TheemergencypushbuttoncanbeconfiguredintheFUPLAtoopenthecircuitbreakerwhenpressedsimultaneouslywiththenormalopenpushbutton.Twodifferentelectronickeysareprovided.Onekeycanonlybeusedfortheprotectionschemeparametrization.Theotheroneisforcontrolmodesselection:local,remoteorlocal/remote.Byusingthesetwokeysacertainseparationbetweenprotectionandcontroloperationcanbeachieved.Ifrequiredageneralkeythatpermitsaccesstobothmodesisprovided.ThesensorforrecognizingwhichelectronickeyhasbeenusedislocatedonthefrontpaneloftheHMIControlUnit.2.3MeasurementREF542pluscanhaveamaximumof8analogueinputchannelsformeasuringcurrentandvoltagesignals.Thesechannelsareorganizedintothreegroups.Group1andgroup2havetobehomogeneous,thatmeanstheycanmeasure3currentsor3voltages.Forexample,measurementof1currentand2voltagesisnotallowed.Group3cangetanytypeofsignals:2currents,2voltages,1currentand1voltage,etc.Channel8inthecurrentREF542plusreleasecanbeusedformeasurementpurposesonly(noprotection.REF542plusanalogueinputsareveryflexible,asthisflexibilityisneededtosupportalltheprotectionfunctionsoftheunititself.Group1andgroup2canbeusedforhomogeneouscurrentorvoltagemeasurementsbothfrominstrumenttransformersandnonconventionalsensors.Group3canbeusedinaheterogeneousway,aswellwithinstrumenttransformersasalsowithsensors.Channel7ingroup3canbeusedforearthfaultcurrentwithcurrenttransformertypeinput;orforthesynchronismcheckfunctionwithvoltagetransformertypeinput.Themostcommonconfigurationusesthreecurrentandthreevoltageinputsandoneearthfaultcurrentinput.Allvaluesareshownonthedisplayasprimaryvalues.Thevaluesregisteredoveranextendedtimeperiod,forexampleenergy,numberofCBoperations,maximumandmeasurementvaluesarepermanentlysaved.Evenafterpowerinterruptionsthisdataisstillavailable.Usingthiscommonconfiguration,thefollowingmeasuredvaluesaredisplayed:Linecurrents,threephasesPhasevoltages,threephasesEarthcurrentorresidualvoltageFrequencyFromtheabovemeasuredquantitiesthefollowingvaluescanbecalculated:Linevoltages,threephasesEarthcurrentorresidualvoltageAveragevalue/maximumvaluecurrent,three-phase(determinedoverseveralminutesApparent,activeandreactivepowerPowerfactorActiveandreactiveenergyMoreover,thefollowingquantitiesformonitoringpurposescanbeprovided:OperatinghoursSwitchingcyclesTotalswitchedcurrentsMeteringpulsesfromanexternalmeteringdevice(upto102.4ProtectionTheREF542plusoffersawiderangeoffunctionsforprotection.Asmentionedbefore,awiderangeofprotectionschemesfortheprotectionofseveralsystemcomponentscanbeconfigured.Theavailableprotectionfunctionscanbecombinedtogethertoformtherequiredprotectionscheme.Figure7showsanexampleofaconfiguredprotectionscheme.Figure7:FUPLAprotectionscheme2.5ControlTheREF542pluspermitsconvenientlocaloperationwithfullinterlockingagainstswitchingerrors.TheswitchpositionofthevariousswitchingdevicesintheswitchbaycanbeshownontheLCDdisplayoftheHMIControlUnit.Iflocalcontrolmodeisselected,switchingactionscanbeinputlocallyusingthecontrolpushbuttonsontheHMIControlUnit.Switchingtoanothercontrolmodecanonlybeachievedbyusingthecorrectelectronickey.Inremotecontrolmode,onlyswitchingactionsfromaremotecontrolunitlikeastationautomationsystemarefeasible.Aspecialcontrolmode,LocalandRemote,isprovidedforuserswhowanttoperformsimultaneousLocalandRemoteswitching.Interlockingbetweentheswitchbaysconnectedtothesamebusbarsystemcanalsobetakenintoaccount.Thisrequirestheavailabilityofstatusinformationoftheswitchingdevicestoandfromotherswitchbays.Thestatusinformationmustbeprovidedeitherbyaconventional,hardwiredringbussystemorbythemoresophisticatedABBstationautomationsystem.Figure8showsanexampleofaconfiguredcontrolschemeoftheCB.Figure8:FUPLAcontrolscheme2.6EventrecordingThelast30recordedeventscanbeshownlocallyontheLCDdisplayoftheHMIunit.Theeventsaremostlyrelatedtoprotectionactivities.Aswellasdisplayingtheeventname,additionalinformationabouttheevent,time,dateandtheRMSvalueoftheshortcircuitcurrentswitchedoffbytheCBareprovided.Eacheventisstampedwiththetimeanddate.ThetimeistakenfromtheinternalclockontheREF542plus,whichcanbesynchronizedbythestationautomationsystem.Inthenextfigure,alistofrecordedeventsisshown.Figure9:EventlistontheLCDoftheHMI2.7FaultrecordingThemultifunctionalunitREF542plusisequippedwithafaultrecordermodule,whichrecordandencodeanalogandbinarydata.Thenumberofrecordeddatachannelsdependsontheinitialconfiguration.Uptosevensignalsoftheanalogchannelsand32binarysignalscanberecorded.Theanaloginputsignalsarerecordedwithasamplingrateof1.2kHzforaperiodofatleast1-secondandforamaximumof5seconds.Therecordingtimeisacombinationofpre-andpostfaulttime.Therecordsaresavedusingatypicalringbufferprocess,i.e.theoldestfaultrecordisalwaysoverwrittenwithanewone.Thenumberofsavedfaultrecordsdependsontherecordtime.Forexample,amaximumof5faultrecordscanbesavedwitharecordingtimeof1s.Faultrecordscanbeexportedandconvertedbytheconfigurationsoftware.Thetransferoffaultrecordscanbedonealsoviatheinterbay.Figure10showsarecordofacrosscountryfaultinanearthfaultcompensatedMVsystemstartingwiththeearthfault.Figure10:RecordofacrosscountryfaultinanMVsystem2.8RealtimeclockREF542plusisequippedwithaninternalrealtimeclockwhichisusedtotimestampevents.Theinternalclockisbufferedbyaspecialsupercapacitor.IncaseofDCpowersupplyfailure,thestoredelectricalenergyinthecapacitorensurescontinuedoperationoftheinternalclockforatleastanothertwohours.ThedateandtimeoftheclockcanbesetviatheHMIControlUnit.REF542plusinternalclockcanbekeptsynchronizedwithanexternalclockindifferentways.Whenconnectedtoastationautomationsystem,REF542plusissynchronizedviainterbaybususingthefacilitiesoftheusedprotocol.Ifbetteraccuracyisrequired,REF542pluscanbesynchronizedusingthededicatedIRIG-BopticalinputportandaGPSmasterclock.Figure11:SynchronizationoftheinternalclockbyaGPSmasterclock2.9ProcessinterfaceTheREF542plusMultifunctionProtectionandSwitchbayControlUnitisdesignedforconnectiontononconventionalcurrentandvoltagesensorsaswellastoinstrumentstransformers.Thankstotheirlinearcharacteristic,moderncurrentandvoltagesensorsprovidegreateraccuracyandreliabilityinsignalmeasurement.Comparedtoinstrumenttransformers,thenewsensorshavethefollowingadvantages:HighaccuracyCompactdimensionsWidedynamicrangeEasyintegrationintheswitchboardThecurrentsensorisbasedontheprincipleoftheRogowskicoilandconsistsofasingleair-coredcoil.Duetothelackofanironcore,thesaturationeffectsofconventionalcurrenttransformersdonotexistanymore.Currentsensorsarethuswellsuitedforthedeploymentofdistanceprotectionanddifferentialprotectionfunctions.Thecurrentsensormeasuresthecurrentvalueusingavoltagesignalthatisproportionaltothederivativeoftheprimarycurrentbeingmeasured.ThenumericalintegrationofthesignalisperformedusingtheDSPintheREF542plusunit.Thecurrentsensorscoverarangefrom0.5to2.0oftheratedcurrent.The80Acurrentsensorsareforexampleverysuitableforapplicationsbetweenacurrentrangeof40Ato160A.Thevoltagesensorisbasedontheprincipleoftheresistivedividerfromwhichthesignalisobtainedandisofatypethatcannotbesaturated.Therefore,thevoltagesensorislinearthroughoutthemeasuringrange.Theoutputsignalisavoltagethatisdirectlyproportionaltotheprimaryvoltage.Thenextfiguresshowsthecombinedsensors.Thecurrentandvoltagesensorsareencapsulatedintoasingleresinunit,andthatisthereasonwhytheyarereferredascombinedorcombisensors.Figure12:CombinedsensorAcapacitivedividerisincorporatedinthecombinedsensortoprovidethepowersupplyforvoltagepresenceindicatorlamps.TheoutputsignalsofthecurrentandvoltagesensorsareconnecteddirectlytotheCentralUnitoftheREF542plus,theydonotrequireadaptationtransformers.Byusingeithermodernsensorsorconventionalmeasurementtransformers,theaccuracyclass1canbefulfilled,onconditionthatthecurrentandvoltagemeasuringvaluesareintherangeofthecorrespondingratedvalues.Theprimaryswitchingdevicesaremonitoredeitherthroughtheauxiliarycontactsorthroughtherelatedsensors,whichprovidethestatusinformationofalltheswitchingcompartmentsintheswitchbay.Besidesthat,signalscomingfromauxiliarycomponentsarealsomonitored.Consequently,atthisinterfacethefollowingactionsareachieved:ControlandinterlockingoftheprimaryswitchingdeviceintheswitchbayControltheCBs,disconnectors,earthingswitchesSupervisionofthespringstatus,ofthecontinuityofCBopencoil,thestatusoftheswitchingdevice.Providingoutputpulsesignalsforexternalenergycountingsystems.ControlofthedisconnectorsdrivemotorsProvidingtheinformationregardinginternalfailure(watchdog.Theinputsofthebinarysignalsareisolatedbyanopto-coupler.Inmostapplications,binaryoutputsareimplementedwithmechanicalrelays.However,inhighlevelapplications,likeaswitchboardinwhichmotorsaredirectlydriven,staticpoweroutputsarerequired.Amaximumof3binaryI/Oboardscanbeinstalled.3DiagnosisandmonitoringTheREF542plusmonitorscontinuoslytheconditionofthesystem,includingtheswitchingdevices.Maintenancerequirementscanthusbeadaptedtotherealsystemconditioninordertoreducedowntimes.ThefollowingtableshowstheparametersmonitoredbytheREF542plus.Alltheparameterscanalsobetransmittedtoacentralcontrolsystemwheretheyareanalyzedandprocessed,sothatthediagnosticsystemscanbeprovidedwithdataforreliabilitycalculationtopredicttheremainingservicelifeandmaintenanceactions.TypeParametersmonitoredSoftwareDiagnosticofREF542plusunitElectricalAuxiliaryvoltagecircuitsPowersupplytomotoroperatorsoftheswitchingdeviceContinuityofwindingsoftheCBopeningcoilMechanicalcomponentsStateofCBoperatingmechanismspringsNumberofmechanicaloperationsGaspressurerespectivelydensityTimeCountofhourstheswitchingdeviceboardinoperation.Contactswitchingtime(fromclosedtoopenusingevents4AnalogoutputAnoptionalanalogoutputmodulewithfourconfigurableoutputscanbeinsertedintheCentralUnit.Theoutputsignalofthismodulecanbesetintherangefrom0to20mAor4to20mA.Eachofthefourchannelscanbeindependentlyactivatedandparameterizedbytheconfigurationsoftware.Thefollowinganalogoutputquantitiesareselectable:AllvoltagequantitiesdirectlyfromtheanaloginputsAllcurrentquantitiesdirectlyfromtheanaloginputsCalculatedresidualcurrentsCalculatedresidualvoltagesCalculatedapparent,activeandreactivepowerCalculatedpowerfactor5CommunicationAnoptionalcommunicationsboardisprovidedforcommunicationwithastationautomationsystem.ThiscanbeanABBstationautomationsystemorathirdpartysystem.WhenusingtheABBstationautomationsystem,alloftheinformationprovidedbytheREF542pluscanbecompletelyaccessedsothatthefollowingcentralizedremotefunctionscanbeimplemented:RemotemonitoringRemotecontrolRemotesettingofprotectionparametersRemotemeasurementEventsrecordingMonitoringofallswitchingdeviceAnalyzeoffaultrecorderdataThefollowingprotocolsforconnectiontoABBstationautomationsystemareavailable:SPA-busLON-busaccordingtoABBLonApplicationGuide(LAG1.4definitionsThesoftwarelibraryLIB542isavailabletointerfacetheREF542plusunitintheABBMicroScadastationautomation.Figure13:ConnectionoftheRE542plusinanABBstationautomationsystemThefollowingprotocolsallowREF542plustobeconnectedtoanythirdpartyautomationsystem:IEC60870-5-103standardincludingtheextensionforcontrolfunctionsaccordingtoVDEW(VereinigungDeutscherElektrizitätswerke=associationofGermanutilitiesDualMODBUSRTU6HousingTheREF542plushousingfortheCentralUnitismadefromsheetaluminium.ItsexteriorischromatizedbothtoprotectthehousingagainstcorrosionandtogaintheshieldingagainstEMCdisturbances.TheCentralUnitallowsasafeintegrationintoaswitchboard.Astandardandawidecaseversion,asshowninthefollowingfiguresareavailable.Inthestandardcaseversion,twobinaryI/Oboardsandanoptionalcommunicationsboardcanbeused.ThewidecaseversioncontainsanadditionalbinaryI/Oboardandtheanalogoutputboard.Figure14:DimensionofthestandardcaseversionFigure15:DimensionofthewidecaseversionThedimensionoftheHMIControlUnitisshowninthenextfigure.Figure16:DimensionoftheHMIControlUnit7Mechanicaldesign7.1REF542plusstandardcaseversion:2I/Oplug-inboardsforcontrolofupto5switchingdevices.1optionalplug-incommunicationboard7.2REF542pluswidecaseversion:3I/Oplug-inboardsforcontrolupto8switchingdevices(withstaticI/Oboard,only7switchingdeviceswithmechanicalI/Oboard.1optionalplug-inboardforoutputof4configurableanalogsignals0to20mAor4to20mA.1optionalcommunicationboard.7.3AnaloginputsREF542plusanaloginputboardisavailableindifferentversionandcanbeequippedwiththefollowingcombinationofinputcurrentand/orvoltagetransformer:3or6currenttransformersforphasecurrents3or6voltagetransformersforphasevoltages1currentorvoltagetransformerfortheresidualcurrentorvoltage1currentorvoltagetransformerformeasurementpurposesWhencombinedsensorsareusedthesignalsareconnectedbyTWINCAMSTplugs.8ListoftheprotectionfunctionsThetablebelowillustratestheprotectionfunctionsinthecur