power system monitoring and control facilities on protective relays

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1、编号：毕业设计(论文)外文翻译（原文）院（系）：机电工程学院专业：电气工程及其自动化学生姓名：陆开荣学号：指导教师单位：电气工程姓名：李彩林职称：副教授2012年5月27日1PowerSystemMonitoringandControlFacilitiesonProtectiveRelaysAbstract:Itisnowpossibletoconsiderintegratingthefunctionsofthepowersystemprotectionsystemswiththoseofthelocalandremotedatacollectionandcontrolsys

2、tems.Astructuredapproachtothisintegrationisnecessary.However,ifthefullbenefitsaretoberealized.Asolutionwhichwillsolvemanyoftheproblemspreviouslyassociatedwiththisintegrationispresentedtogetherwithanexampleofhowitmightinfuturebeappliedinatypicalsubstation.Keywords:Digitalcommunications.Integ

3、ration1.IntroductionThecurrentpracticeinpowersystemtransmissionanddistributionenvironmentsistoseparatethefunctionsofthelocalcontrol,protectionandsupervisorycontrolanddataacquisition(SCADA)systems.Onereasonforthishasbeenthetechnicalconstraintthathaslimitedtheamountofintegrationwhichcanbereli

4、ablyachieved.Localcontrolfacilitieshaveconsistedofhardwiredpanelstakingupmuchcontrolroomspace.Controllogichasbeenprovidedbyhardwiredcontactsorprogrammablelogiccontrollers.Untilrecentlymuchoftheprotectionequipmenthasconsistedofanaloguedevices,againtakingupmuchspace.Mostmodernprotectiondevice

5、susingelectronicandmicroprocessortechnologieshavesofarconcentratedonreducingthespacetakentoimplementtraditionalprotectionfunctions.Generally,SCADAsystemshavebeenaddedmorerecentlyandhavesuppliedtheirowntransducers,interfaceunitsandwiring.Thesehavegrownupinparallelwiththelocalcontrolandprotec

6、tionsystemsdespitethefactthatthisoftenresultedinmuchfunctionalduplication.WhereinformationconcerningtheprotectionoperationhasbeenrequiredbytheSCADAsystemthishasbeenderivedinasecondaryfashion,forexample,feedingtheprotectionoutputsbackintoSCADAdigitalinputunits.Recenttechnologyadvanceshaveled

7、totherealizationthatthisdegreeofduplicationisbecominglessandlessnecessary.GiveninfinitecomputingpoweritcouldbearguedthattheinformationnecessarytoperformprotectionfunctionsisallavailableorcanbemadeavailableontheSCADAnetwork.ItisconceivablethenThattheSCADA