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1、110KV降压变电站的设计摘要随着社会的不断发展,人们对电力供应的要求越来越高,特别是供电的稳定性,可靠性和持续性。然而电网的稳定性,可靠性,持续性往往取决于变电站的合理设计和配置。一个典型的变电站要求变电设备运行可靠,操作灵活,经济合理,扩建方便。出于这几个方面的考虑,本论文设计了一个降压变电站,此变电站有三个电压等级:高压侧电压为110kV,有4回进线,中压侧电压为35kV,有8回出线,2回备用,低压侧电压为10kV,有10回出线,2回备用。同时对于变电站内的主设备进行合理的选型。本设计选择两台SFSZ9-63000/110主变压器,其他设备如站用变,断路器,隔离开
2、关,电流互感器,高压熔断器,无功补偿装置和继电保护装置等等也按照具体要求进行选型,设计和配置,力求做到运行可靠,操作简单,方便,经济合理,具有扩建的可行性和改变运行方式时的灵活性,使其更加贴合实际,更具现实意义。关键字:降压变电站设计电气主接线短路电流计算3ABSTRACTwiththedevelopmentofsociety,people'srequirementfortheelectricitysupplyismoreandmorehigh,especially,thestabilityofelectricity,thecredibilityofelectricit
3、y,thekeepofelectricityHowever,thestabilityofpowergrid,thecredibilityofpowergrid,thekeepofpowergridbedecidedbythereasonabledesignandallocationoftransformersubstation.Atypicaltransformersubstationmodelberequestedtohavereliableelectricequipments,operatevividly,reasonableeconomy,extendconven
4、iently.Proceedfromthisseveralconsiderations,IdesignaStep-downsubstation,thisStep-downsubstationhasthreeelectricvoltagegrades:Thehighvoltagesideisa110kV,whichhave4enteredlines,theintermediatesidevoltageis35kV,thereis8outlinesand2sparelines,thelow-pressuresidevoltageis10kV,thereis10outline
5、sand2sparelines.Tothereasonablechooseofthemainequipmentsinthetransformersubstationatthesametime.ThedesignchoosestwoSFSZ9-63000/110lordtransformers,otherequipments,suchstationtransformer,Circuitbreaker,insulationswitch,Currenttransformer,HighVoltagefuseandRelayprotectiondeviceetc.accordin
6、gtoconcretelyrequirementtochoosetype,designandinstall,hardlytrytoattaincirculatecredibility,operatesimplyandconveniently,reasonableeconomy,havepossibilityandvividlychangestocirculatewayofextension,makeitmoresticktomatchphysically,haverealisticmeaningmore.Keywords:Step-downsubstationdesig
7、nthemainelectricalwiring3Short-circuitcurrentcalculation3论文目录1.设计任务书1.1变电所的规模本次变电所设计为一次区域性变电所,供给附近地区的工业,农业,和居民用电。本期工程一次建成,设计中留有扩建的余地。考虑到实际情况,先建35KV出线8回,2回备用,10KV侧10回出线,2回备用。1.2变电所的基本数据(1)110KV侧基本数据共4回进线,分别通过双回路与系统S1和S2相连,S1对本所110kV母线的短路容量为1500MVA,S2对本所110kV母线的短路容量为1200MVA