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ID:2268037
大小:62.50 KB
页数:23页
时间:2017-11-15
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1、本科毕业设计(论文)中英文对照翻译院(系部)电气工程与自动化学院专业名称电气工程及其自动化年级班级 学生姓名 指导老师王23UnattendedsubstationandsubstationautomationThedevelopmentofautomaticreclosingmadetheunattendedsubstationpractical.Automaticoperation,withoutthecontinuouspresenceofanattendant(operator),wasfirsttriedonthesynchronousconvertersubstationss
2、upplyinganinterurbanelectricrailwayin1914.Intheearly1920s,thedevelopmentofautomaticreclosing,protectiverelays,andmeansforautomaticcontrolofvoltagemadeitpossibleforacsubstationstobecompletelyautomatic.Duringtheperiodwhenthesubstationshadtobecontrolledmanually,itwasnecessarythattheyhandleenoughpowe
3、rtojustifytheoperator`swages.Thisdictatedlargestations,frequentlyservinglargeareasbymeansofmanyfeeders.Thefeedersthatservedthemoredistantpartsofanareahadtogoalongwaybeforetheypickedupanyload.Furthermore,astheloadonalargesubstationgrows,transformercapacityhastobeadded.Thisincreasestheshort-circuit
4、currentonthesecondarysidesometimestheshort-circuitcapacityexceedstheinterruptingcapacityofthecircuitbreakersalreadyinstalled.Appropriateremediesincludebussectionalizing,theinstallationofreactorsorsomecombinationofthetwo.Suchmeasuresarefrequentlyexpensiveandinconvenientandtheyconstituteanundesirab
5、lelimitationonoperatingflexibility.Oncetheunattendedsubstationbecameareality,thesubstationcouldbemadesmaller.Locatednearertheload,andlongfeederswerenolongernecessary.Thisnewmethodofdistributionhadbecomeavailablesinceloadgrowthcouldnowbeaccommodatedbyinstalling23anothersubstationthatcouldcarrypart
6、softhearealoadsformerlycarriedbyadjacentsubstations.Usually,thereisnointerconnectionbetweenthecircuitsenergizedbythevarioussubstations.Consequently,thereisnoincreaseinshort-circuitseverity.however,atthedistributionlevel,tieswitchesareusedtoswitchfeedersorfeedersectionsbetweentransformersinthesame
7、stationortoadjacentsubstationsforsubstationtransformerloadmanagement.Automaticcontrolhasbeenappliedtolargerandlargersubstations,andtomanyhydroelectricgeneratingstations.Itisalsousedonindividualcircuitsandequipmentinman
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