4x200MW大型火电厂毕业设计

第页摘要：发电厂是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济。其中火力发电厂更是占据着非常重要的地位，是电力发展的主力军。本次毕业设计严格遵循火力发电厂的设计规范，通过对电气主接线的设计、厂用电的设计、短路电流的计算、电气设备的选择和校验以及配电装置、防雷装置的设置，简要完成了对所给4×200MW火力发电厂电气一次部分的设计。本次设计中将四台发电机全部升压接入220kV电网，简化了电网结构及电气主接线，省去了升高电压级之间的联络变压器，降低了变压器损耗。在电气设备选择方面尽量选取占地面积小的电气设备，节约土地资源。关键词：火力发电厂，电气主接线，电气设备AbstractPowerplantsplayanimportantroleinpowersystemforthedirectlyinfluenceonthesecurityandeconomyofthewholepowersystem.Includingcoal-firedpowerplantsoccupiesthekeyposition,itisthemainforceinpowerdevelopment.Thegraduationdesignstrictlyfollowedthestandardofthecoal-firedpowerplantdesign.Throughthedesignofthemainelectricalconnection,thecalculationofshort-circuitcurrent,theselectionandcalibrationofelectricalequipmentsandthedesignofdistributiondevice,lightningprotectionequipment,completingtheelectricaldesignofthe4x200MWcoal-firedpowerplant.Thisdesignsendallelectricalenergyto220kVpowergrids,simplifiedthestructureofpowergrids,savingthecontactingtransformerbetweentherisinglevelofvoltageandreducingthelossoftransformer.Inelectricalequipmentselection，trytoselectareasmallelectricalequipmentasfaraspossibletosavethesourceofland.Keywords:coal-firedpowerplants,themainelectricalconnection,electricalequipment第页目录1绪论..................................................................41.1发电厂概述.......................................................41.2毕业设计的主要内容、技术指标......................................42电气主接线设计........................................................52.1概述.............................................................52.1.1电气主接线基本要求.......................................................................................52.1.1220kv电压等级常用主接线...........................................................................52.2拟定主接线方案...................................................62.2.1方案一...............................................................................................................62.2.1方案二...............................................................................................................62.2.3方案比较...........................................................................................................62.3发电机型号选择...................................................72.4变压器选择.......................................................83设计标幺值的计算及短路电流计算........................................93.1设计的基本内容与要求.............................................93.2系统的参数以及待设的火电厂主要电气元件的参数....................103.2.1系统的参数....................................................................................................103.2.2设计的火电厂主要电气元件参数................................................................113.3短路电流的计算..................................................123.3.1f1点短路（看电厂内部）.........................................................................133.3.2f2点短路（看整个系统）...........................................................................153.3.3发电机母线短路（f2点短路看电厂）.......................................................213.3.4f3点短路（矿区母线短路）.......................................................................233.3.4f4点短路（发电机G1G2短路）...............................................................283.3.5f5点短路（发电机G3G4短路）...............................................................314电气设备的选择与效验.................................................344.1概述............................................................344.2电气设备的选择与效验.............................................344.2.1各线路最大工作电流确定.............................................................................344.2.2高压断路器选择与效验.................................................................................354.2.3隔离开关选择与效验.....................................................................................394.2.4电压互感器选择与效验.................................................................................424.2.5电压互感器选择与效验.................................................................................454.2.6线路选择与效验.............................................................................................485防雷保护规划.........................................................515.1概述............................................................515.2架空线路防雷保护................................................515.3电机防雷保护....................................................525.4变压器防雷保....................................................525.5母线防雷保......................................................53第页6配电装置设计.........................................................556.1配电装置选择原则................................................556.2配电装置类型....................................................557设计总结.............................................................568致谢.................................................................579参考文献.............................................................5810附录................................................................59第页1绪论1.1发电厂概述发电厂是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济。发电厂的作用是将其他形式的能量转化成电能。按能量转化形式大体分为火力发电厂、水力发电厂、核能发电厂、风力发电场；考虑发电厂中的地位和作用电力系统中的发电厂可分为大型主力发电厂、中小型地区电厂、及企业自备电厂三种类