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1、光CT原理PPTContentIntroductionNXCTOpticalCTSensorsBetterSolutionstoyourProblemsToday’stechnicalspecsandstandardsbasedonoil-filledinstrumenttransformers.WithDigitalInstrumentTransformersensors,obviousfactslikeratio,burden,costevaluation,ormountingarrangementcanbereconsideredOurD
2、ITproposeanewandwiderrangeofsolutions,withanaccumulationratherthanaselectionofadvantages.?Morefunctionsthanbefore.AREVACurrentSensor NXCTDigitalCurrentSensors NXCTSystemComponents3currentsensorsPowersupply&lifierchassis(2U)Sensorchassis(3U)Cable managementboxFeedercables
3、(inconduit)Splicebox (backofrack)6analogoutputs-either1Aor5A(meteringonly)or200mVTrunkcables (buried)DigitalCurrentSensors Whydigital?SecondaryLoadsAnalogMeteringMoststandardslimitaccuracytomax.120%or200%ratedcurrent.Secondary1Anominal=>1.2Ato2AmaxAnalogProtectionCommonprote
4、ctionclassesrequireoutput upto20-30xratedcurrentSecondary1Anominal?20Ato30AmaxUnlikeconventionalITs,digitalsensorsdelivernocurrentorpowertofeedsecondaryloads.Powerisdrawnfromsubstationbatteries.OKforhighlevelanalogmetering, butprotectionrequireslowlevelanalog (0.2V)ordigital
5、inputrelays2A20AOKNODigitalCurrentSensors ScaleFactorAdjustmentRatiochangeNXCTDigitalCurrentSensors Maincharacteristics36kVto1200kVAC25kVto800kVDCWidedynamicrange<1Ato4000A(metering)Upto108kApeak(protection)FrequencyBandwidthDCto6kHZ(upto20kHzforspecialrequests)LongTermStabi
6、lityMeasurementCanada,NYISO,CAISO,LAPEM, andRussianCertificationformetering.Outdooroperatingtemperatures-40°Cto55°C(-40°Fto131°F)Computeraccesstoextensivediagnosticfunctions.Shortleadtimes16weeksfromtimeoforder.Programmablescalefactor(updatescanbemadeatinstallation)Otherrati
7、ngsareavailableuponrequestComparingTechnologiesCT245kVDigitalCT*HairPinTop-CoreWeight±65kg1400kg720kg144lbs3100lbs1600lbsLightweightdesign*Mergingunitinrelaybuildingincluded(equiv.±kg/lbsperphase)ConventionalCurrentTransformers3Conventional CTsExample:2metering+4protectionfu
8、nctions/phase36cables 6-10mm2M2R1R2R3R4M1RelayBuildingFieldM2DigitalCurrent
