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CompositionofCRH380B-EMUElectricTractionSystemRailwayVehicleEnglishPart1:ReadingMaterialRailwayVehicleEnglishPart1:ReadingMaterial
Multipleunittrains,referredasEMU,areformedinto"units"or"sets"oftwoormorecars.Theyareoftensemi-permanentlycoupledtogether,onlybeinguncoupledinsideaworkshopforheavymaintenance.Thefacilityfortheelectrictractionsystemtobespreadoutalongthetrain,comparedwithcrammingitalltogetherintoabulkylocomotive,allowedanumberofsmallpowerunitstobedistributedunderneaththefloorsofseveralvehiclesinthetrain.TheelectrictractionsystemoftheEMUincludesthepowersupplypartandthetractiontransmissionpartoftheEMUitself.Thepowersupplypartreferstothemaincircuitfromthesubstationtothepantograph,whilethe
transmissionpartoftheEMUitselfreferstothemaincircuit
fromthepantograph,tractiontransformer,tractionconvertertothetractionmotor.Part1:ReadingMaterial
Fig.4-3showsthecircuitdiagramoftractionsystemofonepowerunitofCRH380BEMU.ThepantographontheroofofTC02coachreceivesAC25kVfromOCS,andthentransmitstheelectricenergytothetractiontransformerinstalledunderTC02coachthroughthehigh-voltagecablearrangedontheroofandvehicleend.Thesecondarysideofthetransformerinducesavoltageof4×1850Vandsendsittotheconverterunitunderthemotorvehiclethroughtheconnectingfeederbetweencoaches.Pan—pantograph;CT—contactpowergrid;TF—transformer;TC—tractionconverter;Tm—tractionmotor.Part1:ReadingMaterial
PantographisacomponentthatobtainselectricenergyfromOCS,asshowninFig.4-4.Sincethehigh-voltagelineisconnectedtotwotractionunitsofCRH380BEMU,onlyonepantographneedstoberaisedinnormaloperation,andthepantographisdrivenbycompressedair.CXpantographisselectedforCRH380BEMU,mainlyincludinganinsulator,underframe,shockabsorber,APIMdevice,ADDdevice,upperandlowerarms,upperandlowerguiderods,bowhead,carboncontactstrip,etc.Part1:ReadingMaterial
TheshapeofCRH380BEMUtractiontransformerisshowninFig.4-5.Itisasingle-phasetransformerwithratedvoltageofAC25kV.ThetransformerconvertstheOCSAC25kVontheprimarywindingintothevoltageoffoursecondarywindingsandsuppliespowertothetractionconverter.Thetransformermainlyincludesironcore,winding,insulatingsleeve,oiltank,oilpump,oilcooler,electricforceddraftfanandotherparts.Theoilpump,oilcoolerandelectricforceddraftfanconstitutetheoilcirculatingaircoolingsystemofthetransformer.Part1:ReadingMaterial
CRH380BEMUhasfourtractionconverterssuspendedonthevehiclefloor.Thefunctionofthetractionconverteristoconverttheelectricalsystemtomeettheneedsofthetractiontrainandtractioncontrolfortheformofelectricalenergy.Eachtractionconverterhastwogroupsoffour-quadrantchopper(4QC)modules,onePWMinvertermodule,onegroupoftractioncontrolunit,coolingsystemandintermediateDClink.Eachgroupofinvertercontrolsfourtractionmotors.Themainfunctionoftheconverteristoobtain3200~3600VintermediateDCvoltagefromtheAC1850V/50Hzoutputbythetractiontransformerthroughfour-quadrantrectifier,andthensupplypowertothetractionmotorthroughtheinverteroutputvoltageandthree-phaseACvoltagewithadjustablefrequency.Part1:ReadingMaterialTheoutlineofthetractionconverterisshowninFig.4-6.
CRH380BEMUisequippedwith16tractionmotors,whicharethree-phasefourstageasynchronoustractionmotors.Thetractionmotorsareinstalledonthebogie,andeachwheelsetofthepowerbogieisdrivenbythetractionmotor.Themotorisathree-phasefourpoleasynchronoustractionmotor,whichiscomposedofrotor,stator,casingandaccessories.Thestatoriscomposedofstatorcoreandstatorwinding,whichismainlyusedforgeneratingcircularmagneticfield.Part1:ReadingMaterialTherotoriscomposedofrotorcoreandrotorwinding,whichismainlyusedtoconvertelectricenergyintotractionenergyanddrivethewheelsettorotate.
Thereareninekeytechnologiesofhigh-speedEMU,includinglightweightcarbody,high-speedbogie,brakingsystem,systemintegration,tractioncontrolsystem,tractionconverter,tractiontransformer,tractionmotor,trainnetworkcontrolsystem,etc.ItcanbeseenthatthecompositionandcontrolofEMUtractionsystemplaysanimportantroleinthedevelopmentofEMUtechnology.RailwayVehicleEnglishPart2:VocabularyPart2:Vocabularyfrequency頻率insulatingsleeve絕緣套管insulator絕緣子rectifier整流器shockabsorber阻尼器inverter逆變器carboncontactstrip碳滑板rotor轉(zhuǎn)子ratedvoltage額定電壓stator定子winding繞組magneticfield磁場(chǎng)Part3:CommentariesforLongDifficultSentencesRailwayVehicleEnglishPart3:CommentariesforLongDifficultSentences123
Thepowersupplypartreferstothemaincircuitfromthesubstationtothepantograph,whilethetransmissionpartoftheEMUitselfreferstothemaincircuitfromthepantograph,tractiontransformer,tractionconvertertothetractionmotor.供電部分指的是從變電站到受電弓,而動(dòng)車組自身的傳動(dòng)部分指的是從受電弓、牽引變壓器、牽引變流器到牽引電機(jī)的主電路部分涉及的內(nèi)容。
ThetransformerconvertstheOCSAC25kVontheprimarywindingintothevoltageoffoursecondarywindingsandsuppliespowertothetractionconverter.變壓器將一次繞組上的接觸網(wǎng)AC25kV轉(zhuǎn)換為四個(gè)二次繞組的電壓,并給牽引變流器供電。
Thetractionmotorsareinstalledonthebogie,andeachwheelsetofthepowerbogieisdrivenbythetractionmotor.牽引電動(dòng)機(jī)安裝在轉(zhuǎn)向架上,動(dòng)力轉(zhuǎn)向架的每個(gè)輪對(duì)都由牽引電動(dòng)機(jī)驅(qū)動(dòng)。RailwayVehicleEnglishPart4:ExerciseandActivityPart4:ExerciseandActivity1.Directions:canyoutellwhichofthefollowingitemsarethecomponentsofpantograph,transformer,converter,tractionmotor?Trytoclassifythem.Underframe,Upperarm,lowerpullrod,up
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