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1、MethodofMeasuringPowerQualityandDevelopmentofMonitorDeviceShuyingYangNorthChinaElectricPowerUniversity,Baoding,P.R.China,071003Abstract—Thispaperanalyzesthemainfactorinpowersystemwhichinfluencespowerquality,andthenecessityofdevelopingmonitordeviceofpowerqualityisanalyz
2、ed.Measuringmethodofpowerqualityindexesandthefeasibilityofmonitordevice’srealizationareresearchedalso.Furthermore,thesoftwareisprogrammedandPS-3powerqualitymonitordeviceisdeveloped.Thehardwaresystemiscomposedofindustrycontrolcomputer,dataacquisitionandanalysismodulebas
3、edon80C198microcontrollerandexternalanalogsignaltransformingbox.Everystandardofpowerqualitycanbetestedandanalyzedbydevicedevelopedinthispaper.Atlast,thedeviceisusedtotestthe35KVbusofasteelfactory.Theresultsshowthatthemethodsadoptedarecorrectandtheprecisionishigher.Inde
4、xTerms—Powerquality,measurement,monitordeviceINTRODUCTIONIntherecentyears,asthefastdevelopmentinmetallurgyindustry,chemistryindustryandelectricalrailwaytechnology,morenonlinearelectricalequipments,suchaslarge-sizedelectric-arcfurnace,electricallocomotives,rectifyingins
5、tallations,converterplantsandsoon,areappliedwidely.Thesenonlineardevicesmaketheelectricnetworkmorenonlinear(harmonics),asymmetric(negativesequence),andfluctuating.Atpresent,muchattentionispaidtopowerqualitymanagementineverycountry.TheStateBureauofQualityandTechnicalSup
6、ervisionhaspromulgatedsixpowerqualitystandards,whicharefocusedondeviationofpowersupplyvoltage,frequencydeviationofpowersystem,fluctuationandflickerofvoltage,harmonicsofpublicnetwork,unbalancedegreeofthreephasevoltage,instantaneousover-voltageandmomentaryover-voltagetoe
7、nsurethatelectricalnetworkandelectricalequipmentsrunsafelyandstably.Thesestandardscanundoubtedlypromotethemanagementlevelofpowerqualityeffectively,butcorrespondingpowerqualitymonitordeviceisrequiredtotestandanalyzethepowerqualityindices.1.METHODSTOMEASURINGPOWERQUALITY
8、INDICES1.1.HARMONICSMEASUREMENTConsideringtheimplementationofdevice,followingprocessesshouldbeincludedtomeasureandcal
