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I摘要作为常见的小型输电线路终端，10kV变电站担负着输送电力和变压分配的重要任务，是当今社会中，工农业生产和城乡居民生活供电系统中的枢纽。由于其属于小型电路终端，设计和建立成本相对较低，并且应用广泛，所以在我国经济发展中起着重要作用。此次设计主要介绍10kV变电站的电气部分及继电保护设计。设计的内容包括电气一次部分主接线，设备的选择计算。在设计中，综合考虑到安全、经济和可靠性，对系统进行了短路计算和设备的选择、校验，除此之外，还对变电站继电保护系统配置做了简单的闸述。在设计中绘出主线图等相关图文信息，从而完成了10kV变电站电气一次部分和继电保护的设计。关键词：电气设备;电流计算;电气主接线;继电保护IIAbstractAsacommonsmalltransmissionlineterminal,10kvsubstationfortheimportanttaskofthepowerandpressuredistribution,areintoday'ssociety,industrialandagriculturalproductionpowersupplysystemofhubandurbanandruralresidents.Duetoitsterminalbelongstothesmallcircuit,designandsetupcostisrelativelylow,andwidelyused,soplayanimportantroleintheeconomicdevelopmentofourcountry.Thisdesignmainlyintroduces10kVtransformersubstationelectricalpartandtherelayprotectiondesign.Thecontentofthedesignincludingapartofthemainelectricalwiring,equipmentselectioncalculation.Indesign,comprehensiveconsideringthesafety,economyandreliabilityofthesystemshortcircuitcalculationandselectionofequipment,calibration,inaddition,alsoforsubstationrelayprotectiondidsimplyexpoundsthesystemconfiguration.Drawlinesinthedesigndiagramandrelatedgraphicinformation,soastocompletethe10kVtransformersubstationelectricalpartandthedesignofrelayprotectionatatime.Keywords:Electricalequipment;Currentcalculation;Themainelectricalwiring;RelayprotectionIII目录1绪论...........................................................................................................................................11.1电力能源在当今社会的发展和前景....................................................................11.2课题设计的目的、要求及原则.............................................................................21.2.1设计目的...........................................................................................................21.2.2设计要求...........................................................................................................21.2.3设计原则...........................................................................................................22变电站选址.............................................................................................................................33电气一次部分设计................................................................................................................33.1主变压器的选择........................................................................................................33.1.1电气一次设备介绍.........................................................................................33.1.2主变压器的选定.............................................................................................43.2电气主接线设计........................................................................................................43.2.1电气主接线的要求.........................................................................................43.2.2电气主接线的形式与比较选择..................................................................53.2.3中性点的接地方式.........................................................................................73.3短路电流计算.............................................................................................................73.3.1短路电流计算和分析的目的......................................................................73.3.2有名值的归算..................................................................................................73.3.3标么值的归算..................................................................................................73.3.4短路电流计算..................................................................................................74电气一次设备选择................................................................................................................94.1电气设备和载流导体选择的一般条件：..............................................................94.1.1校验热稳定、动稳定和开断电流...........................................................104.1.2依据机械负荷选择端子.............................................................................104.1.3按电器工作的特殊要求校验....................................................................104.2设备的选择与校验..................................................................................................104.2.1电气一次设备的选择..................................................................................104.2.2断路器的选择................................................................................................10IV4.2.3隔离开关的选择...........................................................................................124.2.4电流互感器的选择.......................................................................................134.2.5站用变压器的选择.......................................................................................134.2.6避雷器的选择................................................................................................135继电保护...............................................................................................................................145.1保护装置....................................................................................................................145.1.1保护装置的类型和任务.............