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兰州交通大学毕业设计（论文）-I-摘要城轨主降压变电所主要给牵引变电所和降压变电所供电，对地铁的正常运营具有很重要的作用。在我国加快地铁工程建设，解决公共交通问题的背景下，研究地铁主降压变电所主接线的工程设计，具有十分的重要意义。首先，本文研究了主变电所主接线的选择问题，按照主变电所主接线的行业共识分别提出了高压侧和中压侧的主接线设计方案，通过对比分析，在满足可靠性、灵活性和经济性的要求下确定了主接线的设计方案。其次，根据主变电所的容量要求和变压器的发展，完成变压器台数和型号的选择。接着，将电力系统原始网络图用标幺值法转换，画出其等值电路图，并且按照方便电气设备选择和校验的原则选择短路点，进行短路容量的计算。最后，根据短路电流的计算结果和我国电气设备的发展情况，进行电气设备的选择。根据主接线确定的方案和电气设备的选择结果，利用CAD软件画出主接线图，按照国标规定、电气设备的尺寸和主变电所实际情况进行电气设备的布置，画出了平面布置图和断面图。关键词：主接线；变压器；短路容量兰州交通大学毕业设计（论文）-II-AbstractThemainsubwayStep-downSubstationmainlysupplypowertoTractionSubstationandStep-downSubstation,ithasacrucialroleforthenormaloperationofthewholesubway.Underthebackgroundofacceleratingtheconstructionofthesubwayengineeringandsolvingtheproblemofpublictransportationinourcountry,itisvitalsignificancetostudydesignofthemainwiringofthemiansubwayStep-downSubstationengineeringFirstly,thispaperstudiestheproblemofselectionofmainwiringofmainsubstation,andcomeupwiththemainwiringdesignandconductacomparativeanalysis.Undertherequirementofreliability,flexibilityandeconomytodeterminethedesignschemeofthemainwiring.Secondly,accordingtodesignrequirementsofthemaintransformer’scapacity,completedtheselectionofthetransformer.Then,basedontheequivalentnetworksimplification,selectionandcalculationofshort-circuitpointshort-circuitcapacity.Finally,accordingtotheshort-circuitcurrentcalculationresultsandthedevelopmentofelectricalequipmentofourcountry,tocompleteelectricalequipmentselectionandlayout.TheprogramestablishedundermainwiringandelectricalequipmentselectionresultsusingtheCADsoftwaretodrawthemainwiringdiagram,accordingtothenationalstandard,electricalequipmentsizeandtheactualsituationofthemainsubstationelectricalequipmentlayout,drawafloorplanandsectionalview.KeyWords:Themainwiring,Transformers,Short-circuitcapacity兰州交通大学毕业设计（论文）-III-目录摘要.....................................................................................................................................IAbstract.....................................................................................................................................II目录..................................................................................................................................III1绪论........................................................................................................................................11.1工程背景.....................................................................................................................11.2设计原则和依据.........................................................................................................11.3设计内容.....................................................................................................................22电气主接线的方案确定........................................................................................................32.1电气主接线设计的原则.............................................................................................32.2主接线的设计.............................................................................................................32.2.1高压侧主接线..................................................................................................32.2.2中压侧主接线..................................................................................................52.2.3动力照明系统主接线的设计..........................................................................63变压器的选择........................................................................................................................73.1主变压器的选择.........................................................................................................73.2动力照明系统变压器的选择.....................................................................................94短路电流的计算..................................................................................................................104.1短路电流计算方法...................................................................................................104.2短路电流的具体计算...............................................................................................105电气设备选择及其布置......................................................................................................155.1110kV侧电气设备的选择及校验............................................................................155.1.1断路器和隔离开关的选择及校验................................................................155.1.2互感器的选择................................................................................................185.235kV侧电气设备的选择.........................................................................................195.310kV侧电气设备的选择..........................................................................................205.4电气设备的布置.......................................................................................................21结论..................................................................................................................................22致谢.........................................................................