毕业论文外文文献翻译GeneralRequirementsToConstructionOfSubstation变电站建设的一般要求1.docx
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毕业论文外文文献翻译GeneralRequirementsToConstructionOfSubstation变电站建设的一般要求1
毕业设计(论文)
外文文献翻译
文献、资料中文题目:
变电站建设的一般要求
文献、资料英文题目:
GeneralRequirementstoConstructionofSubstation
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2017.02.14
外文文献一
GeneralRequirementstoConstructionofSubstation
Substationsareavitalelementinapowersupplysystemofindustrialenterprises.Theyservetoreceive,convertanddistributeelectricenergy.Dependingonpowerandpurpose,thesubstationsaredividedintocentraldistributionsubstationsforavoltageof110-500kV;mainstep-downsubstationsfor110-220/6-10-35kV;deepentrancesubstationsfor110-330/6-10Kv;distributionsubstationsfor6-10Kv;shoptransformersubstationsfor6-10/0.38-0.66kV.Atthemainstep-downsubstations,theenergyreceivedfromthepowersourceistransformedfrom110-220kVusuallyto6-10kV(sometimes35kV)whichisdistributedamongsubstationsoftheenterpriseandisfedtohigh-voltageservices.
Centraldistributionsubstationsreceiveenergyfrompowersystemsanddistributeit(withoutorwithpartialtransformation)viaaerialandcablelinesofdeepentrancesatavoltageof110-220kVovertheenterpriseterritory.Centraldistributionsubstationdiffersfromthemaindistributionsubstationinahigherpowerandinthatbulkofitspowerisatavoltageof110-220kV;itfeaturessimplifiedswitchingcircuitsatprimaryvoltage;itisfedfromthepowertoanindividualobjectorregion.Low-andmedium-powershopsubstationstransformenergyfrom6-10kVtoasecondaryvoltageof380/220or660/380.
Step-uptransformersubstationsareusedatpowerplantsfortransformationofenergyproducedbythegeneratorstoahighervoltagewhichdecreaseslossesatalong-distancetransmission.ConvertersubstationsareintendedtoconvertACtoDC(sometimesviceversa)andtoconvertenergyofonefrequencytoanother.Convertersubstationswithsemiconductorrectifiersareconvertenergyofonefrequencytoanother.Convertersubstationswithsemiconductorrectifiersaremosteconomic.Distributionsubstationsfor6-10kVarefedprimarilyfrommaindistributionsubstations(sometimesfromcentraldistributionsubstations).Withasystemofdividingsubstationsfor110-220kV,thefunctionsofaswitch-gearareaccomplishedbyswitch-gearsfor6-10kVatdeepentrancesubstations.
Dependingonlocationofsubstationstheirswitch-gearmaybeoutdoororindoor.Thefeedandoutputlinesat6-10kVsubstationsaremainlyofthecabletype.at35-220kVsubstationsoftheaerialtype.Whenerectingandwiringthesubstations,majorattentionisgiventoreliableandeconomicpowersupplyofagivenproduction.
Substationsareerectedbyindustrialmethodswiththeuseoflargeblocksandassembliespreparedatthesiteshopsofelectricengineeringorganizationsandfactoriesofelectricalengineeringindustry.Substationsareusuallydesignedforoperationwithoutcontinuousattendanceofthedutypersonnelbutwiththeuseofelementaryautomaticandsignalingdevices.
Whenconstructingthestructuralpartofasubstation.itisadvisabletouselight-weightindustrialstructuresandelements(panels,floors,etc.)madeofbentsections.Theseelementsarepre-madeoutsidetheerectionzoneandareonlyassembledatsite.Thisconsiderablycutsthetermsandcostofconstruction.
Basiccircuitryconceptsofsubstationsarechosenwhendesigningapowersupplysystemoftheenterprise.Substationsfeatureprimaryvoltageentrances.transformersandoutputcablelinesorcurrentconductorsofsecondaryvoltage.Substationsaremountedfromequipmentandelementsdescribedbelow.Thenumberofpossiblecombinationsofequipmentandelementsisverygreat.Whenelaboratingasubstationcircuitry,itisnecessarytostriveformaximumsimplificationandminimizingthenumberofswitchingdevices.Suchsubstationsaremorereliableandeconomic.Circuitryissimplifiedbyusingautomaticreclosureorautomaticchangeovertoreservefacilitywhichallowsrapidandfaultlessredundancyofindividualelementsandusingequipment.
Whendesigningtransformersubstationsofindustrialenterprisesforallvoltages,thefollowingbasicconsiderationsaretakenintoaccount:
1.Preferableemploymentofasingle-bussystemwithusingtwo-bussystemsonlytoensureareliableandeconomicpowersupply;
2.Wideuseofunitizedconstructionsandbuslesssubstations;
3.Substantiatedemploymentofautomaticsandtelemetry;ifthesubstationdesigndoesnotenvisagetheuseofautomaticsortelemetry,thecircuitryissoarrangedastoallowforaddingsuchequipmentinfuturewithoutexcessiveinvestmentsandre-work.
4.Useofsimpleandcheapdevices-isolatingswitches,short-circuitingswitches,load-breakingisolators,fuses,withdueregardfortheirswitchingcapacitymaydrasticallyc