XITRON XT2640 - Individual Vpa Total Results; Voltage Results; Wye Voltage Result; Delta Voltage Result

XT2640OperatingManual 13July2016 Page30of187
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11.5 INDIVIDUALVPATOTAL RESULTS
11.5.1 VOLTAGERESULTS
VPAtotalmeasurementresultsgivenforvoltageistheaveragephasevoltagefortheVPAdependingontheWIRINGsettingforthe
VPA‐
3ø3w(2ch)or3ø3w(3ch) ThemeanoftheøAC,øBCandøABvoltages.
Otherwise ThemeanofallchannelvoltagesintheVPA
11.5.2 WYEVOLTAGERESULT
ThisisonlyavailableforaVPAconfiguredas3ø3w(2ch)or3ø3w(3ch)andis(meanoftheøAC,øBCandøABvoltages)/√3.
11.5.3 DELTAVOLTAGERESULT
ThisisonlyavailableforaVPAconfiguredas3ø4wandisthemeanofthemeasuredøAC,øBCandøABvoltages.
11.5.4 CURRENTRESULTS
VPAtotalmeasurementresultsgivenforcurrentistheaveragephasecurrentfortheVPAdependingontheWIRINGsettingforthe
VPA‐
3ø3w(2ch) ThemeanoftheøA,øBandøCcurrents.
Otherwise ThemeanofallchannelcurrentsintheVPA
11.5.5 WATTSRESULTS
VPAtotalmeasurementresultsgivenforWattsarethetotalpowercomputedfortheentireVPA.ThisisalwaysthesumoftheWatts
foreachchannelintheVPA.
11.5.6 VARANDVARESULTS
VPAtotalmeasurementresultsgivenforVARandVAarethetotalpowercomputedfortheentireVPA.DependingontheVA/VAR
preferenceconfigurationsettingfortheVPAthisisoneofthefollowing‐
Σ(VAR)setting VARisthesumoftheVARforthechannelsintheVPA
VAiscomputeddirectlyfromtheWandVARusing(totalVA)
2
=(Σ(W))
2
+(Σ(VAR))
2

Σ(VA)setting VAisdependentontheWIRINGsetting–
3ø3w(2ch)setting:totalVA=(Σ(VA))*(√3)/2orforothersettings:totalVA=Σ(VA)
VARiscomputeddirectlyfromtheWandVAusing(totalVAR)
2
=(Σ(VA))
2
‐(Σ(W))
2
withpolaritytaken
fromthesumoftheVARforthechannelsintheVPA
11.5.7 POWERFACTORRESULTS
VPAtotalmeasurementresultsgivenforPFarealwayscomputedfromthetotalWattsandVAfortheVPA.
11.6 INRUSHRESULTS
InmostcasesmeasurementresultsdenotedasInrushintheXT2640arethehighestrecordedrespectivemeasurementresultsince
inrushmeasurementcollectionwaslastreset.Theexceptionstothisare–
ValleyInrush Thelowestrecordedvalleymeasurementresult.
VPAVoltageInrush ThehighestrecordedvoltageofanyphaseintheVPAdependingontheWIRINGsettingfortheVPA
3ø3w(2ch)or3ø3w(3ch) øAC,øBCandøABvoltages
Otherwise  Eachphasevoltage
VPACurrentInrush ThehighestrecordedcurrentofanyphaseintheVPAdependingontheWIRINGsettingfortheVPA
3ø3w(2ch)  øA,øBandøCcurrents
Otherwise  Eachphasecurrent
11.7 PHASERESULTS
Allphasemeasurementresultsaregivenindegreesusingeithera‐180°to+180°ora0°to360°rangeasdefinedbythepreferences
menusetting(see12.3.1.6).
Inmanysituationsthemathematicaldefinitionofphaseisused,i.e.ifaphaseø
21
isreturnedforsignalS
2
withrespecttosignalS
1
,
thensignalS
2
ismathematicallyS
2
.sin(ωt+ø
21
)andS
1
isS
1
.sin(ωt).Howeveritisnotuncommoninsomeindustrysegmentstousea
“delay”baseddefinitionofphaseasillustratedbythedrawingshownbelow‐
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