FLIR CM85 - Page 55

FLIRCM82USERMANUALDocumentIdentifier:CM82‐en‐US_AD
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5.8.2Three‐PhasePowerMeasurements

5.8.2.1Three‐PhaseThree‐WireBalanced/Unbalanced
Thepowerofathree‐phasethree‐wirewye(star)configurationismeasuredintwosteps,in
accordancewithFigure5.4.Thetotalpoweristhesumofthetwomeasurements:W=W
1
+
W
2
.


Figure5.4Three‐phasethree‐wiremeasurements
1. SetthefunctionswitchtotheWposition.
2.
Ensurethatthemeterissettoactivepowermeasurement.Ifthe orthe 
indicatorisdisplayed,presstheMODEbuttonrepeatedlyuntilnoneofthese
indicatorsaredisplayed.

3.
Taketwomeasurementsoftheactivepower,inaccordancewithFigure5.4.
4.
Tomeasureanddisplaythepowerfactor,presstheMODEbuttonrepeatedlyuntilthe
indicatorisdisplayed.
5.
Readthepowerfactorvalueonthedisplay.
 Ifthevalueisdisplayedwithoutasign,thephaseofthecurrentsignalislagging
behindthevoltagesignal(inductiveload).
 Ifthevalueisdisplayedwithaminussign(–),thephaseofthecurrentsignalis
leadingthevoltagesignal(capacitiveload).
6. Toreturntoactivepowermeasurements,presstheMODEbuttonrepeatedlyuntil
neitherthe northe indicatorisdisplayed.