电力专业外语.docx
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电力专业外语.docx
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电力专业外语
南京工程学院
期末考查报告书
成绩
电气工程专业外语B
院(系、部、中心)电力工程学院
专业电气工程及其自动化
班级智能081
学生姓名武浩
学号206081034
任课教师朱建忠
2010年12月南京
Page1.Translation(变压器)
1Englishtext
Fromreference1
Transformeraredevicesusedtolowerorraisevoltage,andconsistessentiallyofamagneticcorebuiltupofinsulatedsiliconsteellamination,andusuallywoundwithtwodistinctsetsofcoils,suitablylocatedwithrespecttoeachotherandtermedtheprimaryandsecondarywindings.
Astheprimaryandsecondarywindingsarewoundonthesamecore,andasthemagnetizingfluxiscommontothetwowindings,obviouslythevoltageinducedinasingleturnofeachwindingwillbethesame,andtheinducedvoltagesintheprimaryandsecondarywindingsare,therefore,indirectproportiontothenumberofturnsinthosewindings.
Similarly,secondaryequivalentvaluesimpedance,resistanceandreactancecanbederivedfromtheprimaryvaluesusingthesquareoftheprimarytosecondarytransformationratio.
Recallthatthereisa30。
phasedifferencebetweenphasevoltageandlinevoltageofaStarconnectedtransformerwinding;similarlythereisa30。
phasedifferencebetweencorrespondingvoltagewhenconnectedinstaranddelta.
Keywords:
lamination,proportion
Fromreference2
General
a.Type.Step-uptransformersforusewithmainunitsshouldbeoftheoilimmersedtypeforoutdooroperation,withacoolingsystemasdescribed,suitedtothelocation.GeneralCorpsofEngineerspowertransformerdesignpracticeiscoveredbyGuideSpecificationforCivilWorksConstructionCW-16320.
b.Three-phasetransformers.Inthemajorityofapplications,three-phasetransformersshouldbeusedforgeneratorstep-up(GSU)applicationsforthefollowingreasons:
(1)Higherefficiencythanthreesingle-phaseunitsofequivalentcapacity.
(2)Smallerspacerequirements.
(3)Lowerinstalledcost.
(4)Lowerprobabilityoffailurewhenproperlyprotectedbysurgearresters,thermaldevices,andoilpreservationsystems.
(5)Lowertotalweight.
(6)Reductioninweightsanddimensionsmakinglargercapacitiesavailablewithinpracticalweightandsizelimitations.
c.EHVapplications.InapplicationsinvolvinginterconnectiontoEHV(345kVandabove)systems,reliabilityandapplicationconsiderationsdictatetheuseofsingle-phaseunitsduetolackofsatisfactoryindustryexperiencewiththree-phaseEHVGSUtransformers.
d.Transformerfeatures.Regardlessofwindingconfiguration,foranygivenvoltageandKVArating,withnormaltemperaturerise,thefollowingfeaturesshouldbeanalyzedfortheireffectontransformerlifecyclecosts:
(1)Typeofcooling.
(2)Insulationlevelofhigh-voltagewinding.
(3)Departurefromnormaldesignimpedance.
e.Transformerconstruction.TherearetwotypesofconstructionusedforGSUtransformers.Thesearethecoreformtypeandtheshellformtype.CoreformtransformersgenerallyaresuppliedbymanufacturersforlowervoltageandlowerMVAratings.Thecoreformunitisadaptabletoawiderangeofdesignparameters,iseconomicaltomanufacture,butgenerallyhasalowKVA-to-weightratio.TypicalHVrangesare230kVandlessand75MVAandless.ShellformtransformershaveahighKVA-to-weightratioandfindfavoronEHVandhighMVAapplications.Theyhavebettershort-circuitstrengthcharacteristics,arelessimmunetotransitdamage,buthaveamorelabor-intensivemanufacturingprocess.BothformsofconstructionarepermittedbyCorps’transformerguidespecifications.
Rating
ThefullloadKVAratingofthestep-uptransformershouldbeatleastequaltothemaximumKVAratingofthegeneratororgeneratorswithwhichtheyareassociated.WheretransformerswithauxiliarycoolingfacilitieshavedualortripleKVAratings,themaximumtransformerratingshouldmatchthemaximumgeneratorrating.
Keywords:
arrester,parameter,specification
Fromreference3
Rollthesealedtypedistributiontransformercoreisdevelopedinrecentyears,thenewgenerationoflownoise,lowloss,anditscoretransformernojuncture,reduceno-loadlossandno-loadcurrentno-loadcurrent,high~80%,60%lowerinironwirewoundoncontinuouswindings,tight,concentricitywell.Noisedropped10decibels.Duetothecontinuouswinding,ironmakesfulluseofthemanufacturingofsexualorientation,no-loadlossreducedby20%~30%,isanewgenerationofhigh-techenergy-savingandenvironmentalprotectionproducts.
ThesealedtypedistributiontransformerUSESdon'thangcorestructure,makeinternalandexternaltankcompletelyisolated,nostoragecabinets,thethermalchangesintransformertankoperationbyelasticcorrugatedchipstomakecompensationforexpansion,transformeroilandinsulationpartswithoutsideair,water,andtheseparationoftransformeroilandslowtheagingininsulationparts.Seal
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