Unit 1电气设备概述英文版.ppt

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1、Unit1FundamentalsofPowerPlantsandSubstations电厂和变电站基础11IntroductionofPowerPlantsandSubstations电厂和变电站介绍1.1Powersystems电力系统Componentsofpowersystems电力系统的组成部分:Powerplants电厂Transmissionlines输电线路Substations变电站Electricityusers电力用户Asimplepowersystem一个简单的电力系统:MPowerP

2、lants电厂TransmissionLines输电线路Substations变电站Users用户Generators发电机10kV38.5kV35kV6.3kV2Basicstructureofamodernpowersystem:GSGSSmallGSGSResidentialCommercial120/240VSingle-phasesecondaryfeeder3-phaseprimaryfeederIndustrialcustomer22kV20kV500kV500kV500kV500kVTrans

3、missionsubstation115kV230kV345kV24kVTransmissionsystem(230kV)TosubtransmissionanddistributionTielineBulkpowersystemSubtransmissionanddistributionsystemIndustrialcustomerTielinetoneighbouringsystemDistributionsubstation31.2SubstationsFunctionsofsubstations:T

4、ochange(increase/decrease)voltagesfromavaluetoarequiredlevel,tosatisfytherequirementsofthesystemandcustomersTogather,transferordistributethepowerenergyTobeelectricalnodesinapowernetworkforcontrollingandchangingthenetworktopologyandoperatingpatternbyswitchin

5、gdevices4Typesofsubstations:TransmissionsubstationsCentralsubstationsThemainsubstationsinthesystem,areconnectedtomorethan2powersourcesTransfersubstationsTotransferpowerfromasubstationtoanothersubstationDistributionsubstationsRegionalsubstationsProvidepowers

6、upplytoalocalareaCustomersubstationsToprovidepowersupplytoalargecustomeroragroupofcustomers51.3PowerplantsFunctionsofpowerplants:Powersourcesofpowersystems,toconvertprimaryenergy(chemicalenergy,mechanicalenergy,nuclearenergy,etc.)toelectricalenergyMaintypes

7、ofpowerplants:Fossil-fuelpowerplantsHydropowerplantsNuclearpowerplantsCoalOilGas6Basicprocessofpowergenerationincoal-firedpowerplants:71.2CategoriesofthePrimaryandSecondaryEquipmentDefinitionofPrimaryequipment:Theequipmenttobeusedforproducing,transferringan

8、ddistributingthepowerenergy,usuallywithhighvoltages.CategoriesofthePrimaryEquipment:(1)Equipmentforpowergenerationandtransformation,suchasgeneratorsandtransformers(2)Switchingdevices,suchascircuitbreak