SETTINGS
Measuringcentres
MC320,MC330,MC350&MC350H ‐ User’sManua
27
Reactivepowerandenergycalculation
Usercanselectbetweentwodifferentprinciplesofreactivepowerandenergycalculation:
Standardmethod:
Withthismethodareactivepowerandenergyarecalculatedbasedonassumptionthatallpower(energy)that
isnotactiveisreactive.
Q
2
=S
2
‐P
2
Thismeansalsothatallhigherharmonics(outofphasewithbaseharmonic)willbemeasuredasreactivepower
(energy).
Delayedcurrentmethod:
Withthismethod,reactivepower(energy)iscalculatedbymultiplicationofvoltagesamplesanddelayedcurrent
samples(seechapterEquationsonpage72):
Q=U×I|
+90°
Withthismethod,reactivepower(energy)representsonlytruereactivecomponentofapparentpower(energy).
Connection
PLEASENOTE
Settingsofconnectionsshallreflectactualstateotherwisemeasurementsarenotvalid.
Connection
Whenconnectionisselected,loadconnectionandthesupportedmeasurementsaredefined(seechapterSurvey
ofsupportedmeasurementsregardingConnectionmodeonpage21).
MainmenuSettingsConnectionConnectionmode
Settingofcurrentandvoltageratios
Beforesettingcurrentandvoltageratiositisnecessarytobefamiliarwiththeconditionsinwhichdevicewillbe
used.Allothermeasurementsandcalculationsdependonthesesettings.Uptofivedecimalplacescanbeset
(up/down).Tosetdecimalpointandprefix(up/down)positionthecursor(left/right)tolast(empty)placeor
thedecimalpoint.
Settingsrange VTprimary VTsecondary CTprimary CTsecondary
Maximalvalue 1638.3kV 13383V 1638.3kA 13383A
Minimalvalue 0.1V 1mV 0.1A 1mA
MainmenuSettingsConnectionVTprimary/VTsecondary/CTprimary/CTsecondary
Usedvoltageandcurrentrange(MC350,MC350HandMC330only)
Settingoftherangeisconnectedwithallsettingsofalarms,where100%represents500Vand5A.Incaseof
subsequentchangeoftherange,alarmssettingsshallbecorrespondinglychanged,aswell.
Nominalfrequency(MC350,MC350HandMC330only)
Avalidfrequencymeasurementiswithintherangeofnominalfrequency±32Hz.Thissettingisusedforalarms
only.