电力系统外文英语文献资料Word下载.doc

电力系统外文英语文献资料Word下载.doc

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Comparedwiththehigh-voltagedchigh-voltageactransmissionhasthefollowingsomeadvantages:

（1）thecommunicationwithhighenergy;

（2）substationofsimplemaintenanceandcommunicationcostislow;

（3）acvoltagecaneasilyandeffectivelyraiseorlower,itmakesthepowertransmissionandhighpressureWithsafetyvoltagedistribution

HVDCtransmissionandhigh-voltageactransmissionhasthefollowingadvantages:

（1）itonlyneedtwophaseconductorsandactransmissiontothree-phaseconductors;

（2）inthedctransmissionimpedance,noRongKang,phaseshiftandimpactovervoltage;

（3）duetothesameloadimpedance,nodcvoltage,andtransferofthetransmissionlinevoltagedroplesscommunicationlines,andforthisreasondctransmissionlinevoltageregulatorhasbetterproperties;

（4）indcsystemwithoutskineffect.Therefore,theentiresectionofrouteconductorsareusing;

（5）forthesamework,dcvoltagepotentialstressthaninsulation.ThereforedcWireneedlessinsulation;

（6）dctransmissionlineloss,coronatolittleinterferencelinesofcommunication;

（7）HVDCtransmissionwithoutlossofdielectric,especiallyincabletransmission;

（8）indcsystemwithoutstabilityandsynchronizationoftrouble.

Atransmissionandthesecondtransmissionlinesterminatedinsubstationordistributionsubstations,thesubstationanddistributionsubstations,theequipmentincludingpowerandinstrumenttransformerandlightningarrester,withcircuitbreaker,isolatingswitch,capacitorset,busandasubstationcontrolequipment,withrelaysforthecontrolroomoftheequipment.Someoftheequipmentmayincludemoretransformersubstationsandsomeless,dependingontheirroleintheoperation.Someofthesubstationismanualandotherisautomatic.Powerdistributionsystemthroughthedistributionsubstations.Someofthembymanylargecapacitytransformerfeeders,largeareatootherminorpowertransformercapacity,onlyanearloadcontrol,sometimesonlyadoubly-fedwirefeeders（singlesinglevariablesubstation）

Nowforeconomicconcerns,three-phasethree-wiretypecommunicationnetworkiswidelyused,however,thepowerdistribution,fourlinesusingthree-phaseacnetworks.

Coal-firedpowermeansofmainpowergeneratingdrivegenerators,ifcoalenergyisusedtoproduceispushingtheimpeller,thengeneratesteamforceiscalledthefire.Usecoalproducessteamtopromotetherotatingimpellermachineplantcalledcoal-firedpowerplants.Inthecombustionprocess,theenergystoredinthecoaltoheatreleased,thentheenergycanbetransformedintotheformwithinvapor.Steamintotheimpellermachineworktransformedintoelectricalenergy.

Coal-firedpowerplantscouldfuelcoal,oilandnaturalgasis.Incoal-firedpowerplant,coalandcoalintosmallpiecesfirstthroughthebreakfast,andthenputout.Thecoalconveyerfromcoalunloaderpointtocrush,thenbreakfromcoal,coalroomtopileandthencetopower.Inmostinstallations,accordingtotheneedsofcoalis,Smashthecoalstorageplace,nocoalisthroughtheadjustablecoaltosupplycoal,thebrokenpiecesofcoalisaccordingtotheloadchangestocontrolneeds.Throughthebrokenintothechamber,thecoaldustwasinthesecondwindneedenoughairtoensurecoalburning.

Infunction,impellermachineisusedtohightemperatureandhighpressuresteamenergyintokineticenergythroughtherotation,spinandconvertelectricitygenerator.Steamthroughandthroughaseriesofimpellermachineparts,eachofwhichconsistsofasetofstableblade,calledthepipemouthparts,evenintherotorbladesofmobileLicalled.Inthemouthparts（channelbytubenozzle,thesteamisacceleratingformation）tohighspeed,andthefightinLikineticenergyistransformedintotheshaft.Infact,mostofthesteamgeneratorisusedforairis,thereisspreadintodepression,steamturbineoflow-pressuresteamfromthecoagulationturbine,steamintothecondensesintowater,andfinallythecondensatewateristoimplementandcirculation.

Inordertocontinuouscycle,thesemustbeuninterruptedsupply:

（1）fuel;

（2）theair（oxygen）tothefuelgasburningintheconfigurationisamust;

（3）andcondenser,condensedfromthecondensedwatersupply,seaandrivertolake.Commoncoolingtower;

（4）sincewatervapourinsomeplacesincirculation,willdamageprocessofplentyCleanthesupply.

Thesteampowerplantauxiliarysystemisrunning.Forathermalpowerplant,themainauxiliarysystemincludingwatersystem,burninggasandexhaustsystems,condensationsystemandfuelsystem.Themainauxiliarysystemrunninginthewaterpump,condensationandboosterpump,coal-firedpowerplantsinthemillequipment.Otherpowerplantauxiliaryequipmentincludingaircompressors,waterandcoolingwatersystem,lightingandheatingsystems,coalprocessingsystem.Auxiliaryequipmentoperationisdrivenbymotor,usesomebigoutputbymechanicaldrivepumpandsomeoftheimpellerblades,machinedriveoutfromthemainuseofwatervaporimpellermachine.Incoal-firedpowerplantauxiliaryequipment,watersupplypumpandinduceddraftfanisthebiggestneedhorsepower.

Mostoftheauxiliarypowergeneratingunitvolumeincreasedsignificantlyinrecentyears,thereasonisrequiredtoreduceenvironmentpollutionequipment.Airqualitycontrolequipment,suchaselectrostaticprecipitator,dustcollectionoffluegasdesulfurization,oftenusedindustinthenewcoal-firedpowerplants,andinmanyalreadybuiltinpowerplant,thenaturaldriveormechanicaldrive,fountain,coolingtowerinalakeorcoolingcanalhasbeenappliedincoal-firedpowerplantsandplants,wheretheheatreleaseneedtoassistcoolingsystem.

Incoal-firedpowerstations,somedeviceisusedtoincreasethethermalenergy,theyare

（1）economizerandairpreheater,theycanreducetheheatloss;

（2）waterheater,hecanincreasethetemperatureofwaterintoboilingwaterheaters;

（3）theycanincreaseandfilterthethermalimpeller.

Coal-firedpowerplantsusuallyrequiresalotofcoalandcoalreservoirs,howeverthefuelsysteminpowerplantfuelhandlingequipmentisverysimple,andalmostnofueloilplants.

Thegasturbinepowerplantsusegasturbine,whereworkisburninggasfluid.Althoughthegasturbinemustburnmoreexpensiveoilorgas,buttheirlowcostandtimeisshort,andcanquicklystart,theyareveryapplicableloadpowerplant.Thegasturbineburngascanachieve538degreesCelsiusinthecondensingturbine,however,thetemperatureislower,ifgasturbineandcondensermachine,canproducehighthermalefficiency.Ingasturbineturbineacombinedcyclepowerplant.Thegasthroughagasturbine,steamgeneratorheatrecoveryintherewereusedtogeneratevaporheatconsumption.Watervaporandthenthroughaheatedturbine.Usuallyasteamturbine,andonetofourgasturbinepowerplant,itmustberatedoutputpower.