PF9800seriesUser’sManual
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21
Intheformula
，
wheren
：
themaximumharmonicordersetbyuser
；
k：harmonicorder;
Uk
：
Theeffectivevalueofsingleharmonic
voltage
；
Ik
：
Theeffectivevalueofsingleharmonic
current
；
Note:Incalculatingthetotalharmonicvoltage,currentandpower,lossandcalculate
fromthefundamentaltotheeffectivevalueofthemaximumharmonic,and0
harmonicvalue(DCcomponent)andtheharmonicvaluewhichismorethanthe
maximumarenotcalculated.
5.4JudgmentFunctionofLimit(PF9804)
PF9804hasthejudgmentfunctionofupperandlowerlimit,theoperationsareas
showninFigure5.3.
Figure5.3ThesetupofPF9804limit
TheJudgmentofUpperandLowerLimitofActivePowerandCurrent
OK Whenthemeasuredpowerandcurrentarewithinthepreset
upperandlowervalue(PL≤PM≤PHandAL≤AM≤AH),the
greenOKindicatorwilllightup.
LOWER Whenthemeasuredpowerorcurrentislowerthanthepreset
lowervalue(PM<PLorAM<AL),theLOWERred
indicatorwillturnonandthegreenOKindicatorwill
extinguish,andthecorrespondingunitindicatorWorAwill
twinkle,andthebellwillring.
UPPER Whenthemeasuredpowerorcurrentisupperthanthepreset
uppervalue(PM>PLorAM>AL),theUPPERredindicator
willlightup;ThegreenOKindicatorwillextinguish,and
thecorrespondingunitindicatorWorAwilltwinkle,andthe
bellwillring.
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