XITRON XT2640 - Applications; Channels; Electrical Channels; Mechanical Channel

XT2640OperatingManual 13July2016 Page16of187
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8 APPLICATIONS
ThissectiondiscussesingeneraltermstheuseofXT2640channelsandvirtualpoweranalyzers(VPAs)intypicalapplicationsand
shouldbeusedtodecidewhichchannelsandVPAswillbeusedandwhatpurposeeachVPAperformsinauserapplication.Details
regardingconnectingthesignalstothechannelsaregiveninsection9andconfiguringthechannelsandVPAsaregiveninsection
12.4.
8.1 CHANNELS
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ChannelsarenumberedCH1,CH2,CH3andCH4fromlefttorightwhenlookingattheXT2640rearpanel.
8.1.1 ELECTRICALCHANNELS
EachelectricalchannelprovidestheXT2640withonevoltageandonecurrentmeasurementwhicharealwayssimultaneously
sampledtoprovidethebestpoweraccuracy.TheXT2640canhaveonetofourelectricalchannelsinstalled.
Eachelectricalchannelcanbeoneoffourtypesandeachwithoneofthreecurrentinputoptions.Whichchanneltypeandcurrent
inputoptionisinstalledineachpositionisindicatedbyatwolettercodelabelledintheupperleftcornerofeachchannelsub‐panel.
Thechanneltypeisdenotedbythefirstletterofthetwolettercode–
S‐Provides0.1%accuracy,1MHzclassbandwidth,22bitsamplinganda1000Vrmsmaximumcontinuousvoltageinput
A‐Provides0.03%accuracy,1MHzclassbandwidth,24bitsamplinganda1000Vrmsmaximumcontinuousvoltageinput
L–SameastheAtypebutoptimizedfor<150VvoltageapplicationssuchasAC:DCandDC:DCpowersupplies
W‐Provides0.1%accuracy,5MHzclassbandwidth,22bitsamplinganda600Vrmsmaximumcontinuousvoltageinput
Thecurrentinputoptionisdenotedbythesecondletterofthetwolettercode–
D–DualShunt(upto20Armscontinuousand150Apkinrush)inasingleinputterminalpairwithresolutiondownto
0.1µA,alsocapableofbeingusedwithacurrentoutputCT.
H‐HighCurrent(upto30Armscontinuousand200Apkinrush)withresolutiondownto10µA,alsocapableofbeingused
withacurrentoutputCT.
X–ExternalvoltageoutputCTorShuntInput(20µVto15Vrms)withresolutiondownto0.1µV
Eachchannelcanbeindependentlyconfiguredforvoltagescaling(whenusinganexternalPT)and/orcurrentoffsetandscaling
(whenusinganexternalCTorshunt).
8.1.2 MECHANICALCHANNEL
OptionallyCH4canbeamechanicalMTtypechannel.Thisprovidesanalog(DCvoltage)ordigitalspeed,directionandtorqueinputs
forthemeasurementofmechanicalmotororgeneratordata.
8.2 VIRTUALPOWERANALYZERS(ORVPA)
TheXT2640isactuallythreepoweranalyzersinasinglechassiswithasingleuserinterface.ThesearecalledVirtualPower
Analyzers(orVPA)andarenumberedVPA1,VPA2andVPA3.Thenumbersaresolelydescriptiveandotherwiseservenofunction.
Youmayuseanyone,anytwo,orallthreeoftheVPAsdependingonthespecificapplication.
EachVPAcanbeindependentlyconfiguredformeasurementperiod,LFandHFfiltering,harmonicanalysis,signalfiltering,default
measurementcoupling,resultssmoothinganddisplayedsignificantdigits,multi‐channelwiringconfiguration,andefficiency
grouping.VPAsmayoptionallybeconfiguredtobesynchronizedtoeachother.
Eachinstalledelectricalchannelmaybeconfiguredinanyone(ornone)oftheVPAs.EachVPAmaybeconfiguredforuptoall
channelsinstalled(howeverWtypechannelsmaynotbemixedwithothertypesinthesameVPA).Thechannelsdonothavetobe
physicallyadjacentwhenconfiguringtheminaVPA,forexampleitisOKtoconfigureCH1andCH4inoneVPAandCH2andCH3in
another.
Seesections8.3,8.4and8.5forsometypicalusesofVPAsandsection12.4forconfiguringtheVPAs.
CHANNELS(1TO4MAYBEFITTED)