XITRON XT2640 - Measurement Result Terminology; Wiring Phase Indications; Leading;Lagging Determination; Peak and Valley Results

XT2640OperatingManual 13July2016 Page29of187
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11 MEASUREMENT RESULTTERMINOLOGY
11.1 WIRINGPHASEINDICATIONS
Forconvenience,measurementresultsforindividualwiringphasesaredenotedbytheuseofphaseletterlabelsintheXT2640.The
useoftheselabelsdependsontheWIRINGconfigurationsetting.
Allmeasurementresultsgivenforanindividualwiringphasearedenotedasfollows‐
øA,øB,øC,orøD Dataobtainedfromthe1st,2nd,3rdor4thchannelsinaVPArespectively;for3ø3w(2ch)WIRINGthisis
onlyusedforcurrentresultsandtheøCdataisthatobtainedfromthecombinationoftheøAandøB
data.
A,B,C,orD Dataobtainedfromthe1st,2nd,3rdor4thchannelsinaVPArespectively(onlywhenaVPAis
configuredforNx1øWIRING).
øAC DataobtainedforvoltageorpowerresultsbetweenøAandøC;for3ø3w(2ch)WIRINGthisisthedata
fromthe1stchannelintheVPA,otherwisebetweenthe1stand3rdchannelsinaVPA(voltageonly).
øBC DataobtainedforvoltageorpowerresultsbetweenøBandøC;for3ø3w(2ch)WIRINGthisisthedata
fromthe2ndchannelintheVPA,otherwisebetweenthe2ndand3rdchannelsinaVPA(voltageonly).
øAB DataobtainedforvoltageresultsbetweenøAandøB(i.e.the1stand2ndchannelsinaVPA,notused
whenaVPAisconfiguredforNx1øWIRING).
N DataobtainedforNeutralcurrentasmeasuredfromthecombinationofthechannelsinaVPA(only
whenaVPAisconfiguredfor2ø3wor3ø4wWIRING).
11.2 LEADING/LAGGINGDETERMINATION
WhetherthecurrentisleadingorlaggingthevoltageisdenotedbythedirectionofanarrowshownimmediatelyaftermostPFdata.
Ifthearrowispointingupwardsthenitisleading,ifdownwardsthenitislagging.
Foranindividualchannel,lead/lagisdeterminedfromthephaseofthefundamentalcurrent(ifavailable)orbyanalysisofthe
signalsbycomputingthepowerresultobtainedbyusingadelayedcurrentsignal(ifnofundamentalisavailable).
ForaVPAtotalthisisdeterminedfromthepolarityofthesumofthechannelVARresults.
Note:
Therearenominimumsignallevelsforleading/laggingdetection.Theindicationisvalidatallsignallevels.
11.3 PEAKANDVALLEYRESULTS
ThereareseveraltypesofpeakmeasurementresultsavailablefromtheXT2640–
HighestPeak ThisisdenotedontheXT2640screensbyPkfollowedbyanuparrowandisthehighestsampledsignal
duringeachmeasurementperiod.
LowestPeak ThisisdenotedontheXT2640screensbyPkfollowedbyadownarrowandisthelowestsampledsignal
duringeachmeasurementperiod.
Peak ThisisdenotedontheXT2640screensbyPkandisthelargest(i.e.withoutregardtothepolarity)
sampledsignalduringeachmeasurementperiod.
Peak‐to‐Peak ThisisdenotedontheXT2640screensbyPkPkandistheresultofsubtractingthelowestpeakresult
fromtherespectivehighestpeakresult.
ValleyPeak ThisisdenotedontheXT2640screensbyVlyandisestablishedasfollows–
Thelargest(i.e.withoutregardtothepolarity)ofallsamplesobtainedforeachsignalwithineveryhalf‐
cycleofthefundamentalperiodisrecorded;thesmallest(i.e.withoutregardtothepolarity)ofthese
recordedhalf‐cyclesampleswithineachmeasurementperiodisrecordedasthesignalvalley
measurementresults.
Thismeasurementresultisonlyavailableifthefundamentalfrequencyisknownandthemeasurement
periodcontainsatleasttwofundamentalcycles.
Peak‐Valley ThisisdenotedontheXT2640screensbyPk‐Vlyandistheresultofsubtractingthevalleyresultfrom
therespectivepeakresultandsoisameasurementofthepeak‐to‐peakmodulationofeachsignalas
determinedovereachmeasurementperiod.
Thismeasurementresultisonlyavailableifthefundamentalfrequencyisknownandthemeasurement
periodcontainsatleasttwofundamentalcycles.
11.4 INDIVIDUALCHANNELRESULTS
AllmeasurementresultsgivenforanindividualchannelaretheresultsforthatchannelwithoutregardtotheWIRINGconfiguration
oftheVPAinwhichthechannelisconfigured.