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1、青岛理工大学毕业设计（论文）摘要变电站是改变电压的场所。为了把发电厂发出来的电能输送到较远的地方，必须把电压升高，变为高压电，到用户附近再按需要把电压降低，这种升降电压的工作靠变电站来完成。变电站的主要设备是开关和变压器。按规模大小不同，称为变电所、配电室等。随着现代工业的不断发展，人们对电力供应的要求越来越高，特别是供电的安全性、可靠性和稳定性。然而电网的安全性、可靠性和稳定性往往取决于变电站的设计和配置。出于对这几方面的综合考虑，本论文设计了一个35kV的降压变电站。本次设计首先对负荷进行了分析与计算，根据负荷的大小选取主变压器
2、型号，然后根据主接线的经济可靠、运行灵活的要求，为各电压等级选择接线方式，在技术和经济方面进行比较，灵活选取最优的接线方式。设计中还进行了短路电流的计算与高压设备的选择与校验，如高压断路器、高压隔离开关、高压熔断器、电压互感器、电流互感器等。此外设计还进行了防雷保护的计算与整定来保障整个系统的安全运行。关键词：35kV变电站，变压器，防雷保护52青岛理工大学毕业设计（论文）AbstractThesubstationisaplacetochangevoltage.Inordertomaketheelectricenergytransp
3、ortfromthepowerplantstodistantplaces,thevoltagemustbetakenrisetobecomehighvoltage,andthenaccordingtotheusers’demand,thevoltageshouldbereducedcorrespondingly.Abovetheworkiscompletedbythesubstation.Themainequipmentsofsubstationareswitchgearsandtransformers.Accordingtothe
4、differentscaleofthesubstation,theplaceiscalledpowersubstationorpowerdistributionroom,etc..Withthedevelopmentofmodernindustry,thedemandofpowersupplyisincreasinglybecomehigherandhigher,especiallythepowersupplysafety,reliabilityandstability.However,thesecurity,reliability
5、andstabilityofpowersystemareoftendependsonthesubstation’sdesignandconfiguration.Byconsideringtheseveralaspects,thisthesisde-signeda35kVstep-downsubstation.First,thisdesignhascarriedontheanalysisandcalculationoftheload,accordingtothesizeoftheloadselectthemaintransformer
6、model,thenaccordingtothemain-wiring’srequirementsofeconomical,reliable,andflexibletoselecttheconnectionmodefordifferentvoltagelevel.Compareintheaspectsoftechnologyandeconomy,selecttheoptimalwayofwiringflexibly.Thedesignalsocarriedoutthecalculationofshort-circuitcurrent
7、aswellastheselectionandcheckingofthehighpressureequipment,suchashigh-voltagecircuitbreaker,high-voltageisolator,high-voltagefuse,voltagetransformer,currenttransformer,etc..Inaddition,thispaperalsoincludingthedesignandsettingcalculationoflightningprotectiontoguaranteeth
8、esecurityofthewholesystem.KeyWords:35kVsubstation，transformer，lightningprotection52青岛理工大学毕业设计（论文）目录摘要IAbstractII第1章绪论
