摘要本次的毕业设计是110kV工业区降压变电站的设计，该变电站位于新城区，是工业集聚区负荷中心的新建变电所，整个设计分为两部分，电气一次部分和二次部分。电气一次部分的主要内容有：变电所总体分析、负荷分析计算与变压器选择、电气主接线设计、短路电流计算及电气设备选择、配电装置及电气总平面布置设计和防雷保护设计。电气二次设计主要内容有：三个电压等级线路保护整定计算、变压器和电容器保护整定计算。在这次设计中，我通过总体分析与负荷分析对主变进行选择，在满足可靠性、经济性和灵活性的条件下进行主接线的选择，通过短路电流的计算对主要电气设备进行选择和校验，根据变电所设计规范选择配电装置、电气总平面和防雷设计，然后进行了各电压级线路保护整定计算及变压器、电容器保护正定计算，最后用AutoCAD绘制了一次接线图和二次保护图。关键词：变电站，变压器，电气主接线，设备选择，继电保护AbstractThegraduationprojectistodesignindustrialzonebuck110kVsubstation,thesubstationislocatedinthenewcity,andisthecenterofindustrialagglomerationarealoadthenewsubstation,thewholedesignisdividedintotwoparts,thefirstpartandthesecondpartoftheelectrical.Aportionoftheelectricalmaincontentare:overallanalysissubstation,transformerloadcalculationandanalysistoselectthemainelectricalwiringdesign,short-circuitcurrentcalculationandelectricalequipmentselection,electricaldistributionequipmentandgenerallayoutdesignandlightningprotectiondesign.Secondaryelectricaldesignofthemaincontentsare:threevoltagelevelslineprotectionsettingcalculations,transformerandcapacitorprotectionsettingcalculations.Inthisdesign,Ipassedtheoverallanalysisofthemaintransformerandloadanalysistochoose,tomeetthereliability,economyandflexibilityinthechoiceofmainwiringconditions,bycalculatingtheshort-circuitcurrentselectionofmajorelectricalequipmentandparity,accordingtothedesignspecificationschoosesubstationdistributionequipment,electricalgeneralplanandminedesign,thenthevoltagelevelofeachlineprotectionsettingcalculationandtransformers,capacitors,protectivedefinitecalculations,andfinallydrawingawiringdiagramandsecondaryprotectionmapwithAutoCAD.KeyWords:substations,transformers,electricalmainconnectionequipmentselection，equipmentselection,relayprotectionHYPERLINK"http://fanyi.baidu.com/gettts?lan=en&text=Inthisdesign,Ianalyzedthechoiceofthemaintransformerthroughoverallanalysisandload,arethemainwiringofthereliability,economyandflexibilityundertheconditionofselection,selectionandcalibrationofthemainelectricalequipmentthro