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1、GenericSpecificationForHighPerformancePowerMonitoring,RevenueMetering,PowerQualityRecording,andRTUFunctionalityNexus®1252Meter2.PRODUCT2.1PowerMetersA.Powermetershallbemulti-function3phasesolidstateunitwithabilitytoconnecttoeither3phase,4wireWyeor3phase,3wiredeltacircuits.B.Pow
2、ermetershallincludetwo10-character,alphanumericpasswords,whichshallprotecttheunitfromunauthorizedtampering.C.Voltageandcurrentinputstothemetershallconformtothefollowingataminimum:1.Monitorshallacceptinputoffour(4)independentvoltageinputsandfour(4)independentcurrentinputsofthest
3、atedcapacity.2.Voltageinputshallbe120voltsACwithavailableoptionfordirectconnectiontovoltagecircuitsofupto600VACwithouttheuseofpotentialtransformers.3.Voltageinputshallbeopticallyisolatedto2500voltsDC.ShallmeetorexceedANSIC37.90.1(SurgeWithstandCapability)4.Currentinputshallbera
4、tedfor5Ampswithinputs2xcontinuousprogrammabletoanyCTrange.5.CurrentinputsshallbesolidU-Boltstudinputswithaten-secondover-currentratingof100Amps,athreesecondover-currentratingof300Amps,andaone-secondover-currentratingof500Amps;at23oC.D.Powermetershallmeasureandreportthefollowing
5、quantitiesataminimum:1.Voltage,bothphasetoneutralandphasetophase,forallthreephases;Auxiliaryvoltage;Phaseanglesforeachvoltagerelativetoeachother.Onecycle,200millisecondsandonesecondreadingsshallbeavailablesimultaneously.2.Current,phaseA,B,C,N-measured,andN-calculated;Phaseangle
6、sforeachcurrentrelativetovoltages.Onecycle,200millisecondsandonesecondreadingsshallbeavailablesimultaneously.Page11of11112112E107747RevF3.Watts(totalandperphase),VARs(totalandperphase),VA(totalandperphase),PowerFactor(totalandperphase)andFrequency.200millisecondsandonesecondrea
7、dingsshallbeavailablesimultaneously.4.AccumulatedWatt-hr,VA-hr,andVAR-hr;Watt-hrreceived;Watt-hrdelivered.VAR-hrandVA-hrreadingshallbestoredineachofthe4quadrantsofpower.5.Powerdemandshallbecalculatedusingfour(4)differentaveragingmethods:ThermalAverage,FixedWindowAverage,Sliding
8、WindowAverage,andPredictedAverage.Valuesforallaveragin
