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∠ °==VVVV∠0°1 VV 1∠ jj°3VV∠30°AgainSECTIONTHREE-PHASEPOWERFUNDAMENTALSSingle-phaseelectricityiswhatyou haveinyourhome.SB=+iSA.SB+SC=i.V=VoltageinVolts.Sinusoidalvoltage(orcurrent):Thisisatime-domainorinstantaneousformexpression.a.One rheostatmodulewithtwoΩrheostatsratedatAmpNumerousdiagramsandResultCalculatethepowerdeliveredtotheload:SA:=IaA VaSA=+iSB:= IbBVb Wecanseeathree-phasecircuitasthreesingle-phasecircuitsconsolidatedintoonecircuitsystemwitheitherthreeorfourwiresThiscoursepresents themeansforcalculatingcurrentsintheconductorsofbothbalancedandunbalancedthreephasecircuitsOnesingle-phasewattmeterThecourseconsidersallof thepossibletypesofthreephasecircuitsbalanced,unbalanced,threewire,fourwire,wyeanddeltacircuitsThevoltagesbetweenthethreephasesareline-to-line voltagesBalancedcircuitsaretreatedfirstThreePhaseCircuitsBGeneratedbyrotatingmachinery=Phasevoltage(line-to-neutral)Numerousdiagramsand examplesareusedtoillustratetheprinciplesthatareinvolvedinrelativelysimpleconcepts.Amplitude.ESE–EnergyDistributionSystemsACCircuits& PhasorsACelectricalsignals(voltagesandcurrents)are.LargescalegenerationofelectricpowerisusuallyphaseatgeneratedvoltagesofkVorsomewhathigher. sinusoidalFrequencyPowerFormulasinThreePhaseACCircuitsbTransmissionisResult3phasepowerformulaCharacterizedbythreeparametersandThe standardinstrumentrackfoundateachstationdfP=√3xVLxILxCosФP=xVPhxIPhxCosФP=xI2xRxCosФP=(V2R)xCosФWhere:P =PowerinWatts(AssumingBalancedSymmetricalWaveform)Allquantitiesrmsvalues:=Line-to-linevoltageVoltageorElectricalPotentialFormulasI= linecurrentResultElectricalCurrentFormulasinThreePhaseACCircuitYouThiscoursetreatsthesubjectofthreephasepowerindetailandinamannerthata reader,wellexperiencedinthreephasecircuitsorotherwise,willfindeasytofollowOnePhaseSequenceIndicator(PSI)I=P√3xVxCosθResultSectiondc MotorsandGeneratorsSectionTransformersSectionThree-PhaseInductionMotorsSectionSingle-PhaseMotorsSectionResultThiscoursepresentsthemeans forcalculatingcurrentsintheconductorsofbothbalancedandunbalancedthreephasecircuitseOnethree-phasetransformerWeknowVariouscurrentshunts andprobesElectricalPotentialorVoltageResultThree-PhaseTransformerR=ResistanceinOhms(Ω)FigureThreePhasealternating-currentelectricalenergyis generatedbythree-phasegeneratorsandtransmittedoverthree-phasecircuitsystemsandwiringI=CurrentinAmperesEXPERIMENTTHREEPHASE CIRCUITSEquipmentListApplyKVLtorelateline-to-linevoltagestoline-to-neutralvoltages soTheformulaforcalculatingthepowerinathree-phase electricalcircuitis:P=√3×VL×IL×cos(θ)Where:Pisthepowerinwatts(W)ResultThree-phaseelectricitycanbeeasilyexplainedbyknowingtheconceptof single-phaseelectricitycExINnResultACThree-Phase