Thesis - Influence of instrument transformers on power syste

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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