某冶金机械修造厂总降压变电所及配电系统设计

本科毕业设计说明书某冶金机械修造厂总降压变电所及配电系统设计THEDESIGNOFMETALLURGICALMACHINERYREPAIRYARD,STEP-DOWNSUBSTATIONANDDISTRIBUTIONSYSTEM学院（部）：电气与信息工程学院专业班级：电气08-5班学生姓名：周波指导教师：李红月讲师2012年6月1日安徽理工大学毕业设计I某冶金机械修造厂总降压变电所及配电系统设计摘要本文详细介绍了某煤矿地面35kV变电所的设计。文中对该变电所的负荷计算与变压器的选择、供电系统的拟定与短路计算、变电所电器设备的选择、继电保护方案的拟定与整定以及变电所的防雷与接地皆有详细的说明。特别对主接线的选择,变压器的选择,还有一些电气设备如断路器、电流互感器、电压互感器等的选择和校验作了详细的说明和分析。本次设计的内容紧密结合实际，通过查找大量相关资料，设计出符合当前要求的变电所。设计中除采用了一些固定方式的保护和常规保护，通过电力监控综合自动化系统，可以使变电站内值班人员或调度中心的人员及时掌握变电所的运行情况，直接对设备进行操作，及时了解故障情况，并迅速进行处理，达到供电系统的管理科学化、规范化、并且还可以做到与其他自动化系统互换数据，充分发挥整体优势，进行全系统的信息综合管理。在本次设计中，得到了学校老师、同学的耐心指导和大量帮助，在此对他们表示衷心的感谢和崇高的敬意。关键词:短路电流计算继电保护断路器安徽理工大学毕业设计IITHEDESIGNOFMETALLURGICALMACHINERYREPAIRYARD,STEP-DOWNSUBSTATIONANDDISTRIBUTIONSYSTEMABSTRACTThispaperintroducessomscoalmine35kVsubstationdesignground.Inthispaper,theloadcalculationandtransformersubstationofchoice,powersupplysystemwithshortcircuitcalculation,substationworkedelectical,relayprotectionschemewithsettingandworkedthelightningprotectionandgroundingsubstationisdetailedinstructions.Italsodiscussesthechoiceofmainwiring,highpressureequipmentandallkindsoftheprotectionofrelay,thecalculationofload,shortcurrentandsoonindetail,especially,thechoiceofmainwiring,transformerandsomeelectricequipmentsuchascircuitbreaker,currentandVoltagesensor.Itshowsmainwiringofsubstation,thedistributionofplaneandsomeprotectionequipmentofThedesignnotonlyadoptssomestable-formandgeneralprotectionsbutalsoadoptsPCprotection.Thesyntheticalautomationsystemofelectricpowersupervision,whichcanmakeworkersondutycontrolthesituationofsubstationtimely,operatetheequipmentsdirectly,knowthebreakdownanddealwithitwithoutdelay,sothatthesystemofpowersupplyisscientificandstandardinmanagement.What’smore,itcanexchangedatawithotherautomaticsystemsandgivefullplaytowholeadvantageinordertomanageinformationinallsystemsasawhole.KEYWORD:thecalculationofshortcurrent，theprotectionofrelay，circuitbreaker安徽理工大学毕业设计i目录摘要................................................................................................................................IABSTRACT......................................................................................................................II1绪论.............................................................................................................................11.1论文背景及目的.............................................................................................11.2论文研究方法...............................................................................................11.3供电设计的主要内容...................................................................................12负荷计算与变压器选择.............................................................................................22.1计算负荷定义.................................................................................................22.1.1计算负荷目的..................................................................................................22.1.2计算负荷方法...................................................................................................22.2冶金厂用电负荷计算......................................................................................22.3功率因数的改变..............................................................................................52.4主变压器的选择.............................................................................................62.4.1变压器的分类...................................................................................................62.4.2变压器台数选定原则.....................................................................................62.4.3变压器容量选择原则.....................................................................................72.4.4变压器容量确定..............................................................................................73导线截面的选择.........................................................................................................93.1电线、电缆截面选择.....................................................................................93.2经济电流密度选择原则从两方面考虑.........................................................94主接线的确定与短路计算.......................................................................................114.1变配电所类型的选择...................................................................................114.2接线图的意义和目的...................................................................................114.2.1主接线的设计原则和要求.........................................................................114.2.2主接线..............................................................................................................124.2.3桥形接线.........................................................................................................124.2.4单母线分段接线............................................................................................134.3短路电流的分类与计算方法.......................................................................144.3.1短路的原因....................................................................................................144.3.2短路的种类.............