CTG007_Power Factor Correction Guide

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1、CTG007TechnologyGuidePowerfactorcorrectionAnintroductiontotechnologyandtechniquesReducingenergyusemakesperfectbusinesssense;itsavesmoney,enhancescorporatereputationandhelpseveryoneinthefightagainstclimatechange.TheCarbonTrustprovidessimple,effectiveadvicetohelpbusinesses

2、takeactiontoreducecarbonemissions,andthesimplestwaytodothisistouseenergymoreefficiently.Thistechnologyguideintroducespowerfactorcorrection,discussingpracticalactionthatorganisationscantake.ContentsUnderstandingpowerfactor01Powerfactorcorrection02Implementingpowerfactorco

3、rrectiontechniques03Glossary04Powerfactorcorrection0UnderstandingpowerfactorWhatispowerfactor?Figure1RelationshipbetweentotalpowerandusefulpowerPowerfactorisawayofdescribinghowefficientlyelectricalpowerisconsumed.ItreferstopowerinanalternatingTotalpower—kVAcurrent(AC)el

4、ectricalcircuit,eitherforasinglepieceReactiveofequipmentoralloftheelectricalequipmentatasite.power—kVAThepowerthatisdrawnfromthenetworkcanbeRdescribedasconsistingoftwoparts—usefulpowerandUsefulpower—kW100kWreactivepower.Powerfactor=Usefulpower=cosθUsefulpoweristhepowerth

5、atequipmentneedstoachieveTotalpowerthetaskathandanditismeasuredinkW.ReactivepowerisdrawninadditiontousefulpowerbyareactiveloadandismeasuredinkVA.TheconsumptionofReducingtheeffectsofreactivepowerwillcausetheangleθRreactivepowerdoesnotcontributetoachievingthetask.togetclos

6、erto0º,meaningthepowerfactorwillgetclosertounity.Powerfactorcorrectiontechniquescanachievethis.Theusefulpowerandthereactivepowertogetherdeterminethepowerdrawnfromthenetwork,thatis,thePoorpowerfactorhasnegativeimplicationsforbusinessestotalpower(alsoknownasapparentpower),

7、measuredinbecauseit:kVA.TotalpowerisnotthelinearsumofusefulpowerandDrawsmorepowerfromthenetwork—costingmoretoreactivepower.However,lesseningtheeffectsofreactiveachievethesametaskspowerwillreducethepowerneededfromthenetworktocompletethesametasks.Canincura‘poorpowerfactorp

8、enalty’fromthesupplier,sometimescalleda‘reactivepowercharge’Powerfactoristheratioofdeliveredusefulpower