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1、INFLUENCEOFINSTRUMENTTRANSFORMERSONPOWERSYSTEMPROTECTIONAThesisbyBOGDANNAODOVICSubmittedtotheOceofGraduateStudiesofTexasA&MUniversityinpartialful llmentoftherequirementsforthedegreeofMASTEROFSCIENCEMay2005MajorSubject:ElectricalEngineeringINFLUENCEOFI
2、NSTRUMENTTRANSFORMERSONPOWERSYSTEMPROTECTIONAThesisbyBOGDANNAODOVICSubmittedtoTexasA&MUniversityinpartialful llmentoftherequirementsforthedegreeofMASTEROFSCIENCEApprovedastostyleandcontentby:MladenKezunovic(ChairofCommittee)AliAburKrishnaR.Narayanan(Me
3、mber)(Member)WilliamM.LivelyChananSingh(Member)(HeadofDepartment)May2005MajorSubject:ElectricalEngineeringiiiABSTRACTIn
uenceofInstrumentTransformersonPowerSystemProtection.(May2005)BogdanNaodovic,B.S.,UniversityofNoviSad,SerbiaandMontenegroChairofAdvi
4、soryCommittee:Dr.MladenKezunovicInstrumenttransformersareacrucialcomponentofpowersystemprotection.Theysupplytheprotectionsystemwithscaled-downreplicasofcurrentandvoltagesignalspresentinapowernetworktothelevelswhicharesafeandpracticaltoop-eratewith.Thec
5、onventionalinstrumenttransformersarebasedonelectromagneticcouplingbetweenthepowernetworkontheprimarysideandprotectivedevicesonthesecondary.Duetosuchadesign,instrumenttransformersinsertdistortionsinthementionedsignalreplicas.Protectivedevicesmaybesensit
6、ivetothesedistortions.Thein
uenceofdistortionsmayleadtodisastrousmisoperationsofprotectivedevices.Toovercomethisproblem,anewinstrumenttransformerdesignhasbeendevised:opticalsensingofcurrentsandvoltages.Inthetheory,novelinstrumenttransform-erspromiseadi
7、stortion-freereplicationoftheprimarysignals.Sincethementionednoveldesignhasnotbeenwidelyusedinpracticesofar,itssuperiorperformanceneedstobeevaluated.Thisposesaquestion:howcanthenewtechnology(design)beevaluated,andcomparedtotheexistinginstrumenttransfor
8、mertechnology?Theimportanceofthisquestionliesinitsconsequence:isthereanecessitytoupgradetheprotectionsystem,i.e.toreplacetheconventionalinstrumenttransformerswiththenovelones,whichwouldbequiteexpensiveandtime-consuming?Theposedquestionc
