110kV平乐站电气一次设备初步设计(庞千钫)

毕业设计说明书题目：110kV平乐站电气一次设备初步设计学院：成人教育学院专业：电气工程及其自动化学生姓名：庞千钫班级：学号：2014119711139指导教师：刘海浪题目类型：理论研究实验研究工程设计工程技术研究软件开发2015年10月10日摘要随着经济的发展和现代工业建设的迅速崛起，对电力系统的要求也越来越高。变电站作为电力系统的重要组成部分，直接影响整个电力系统的安全与经济运行。本次设计为110kV平乐站电气一次设备初步设计，分析原始资料，依据设计任务书的要求和国家有关方面的规章制度，再结合当地的实际情况，考虑远景规划，进行设计。本设计首先根据当地实际情况，进行负荷分析，容量计算确定变电所的主接线方式，选择合适的变压器。然后进行参数计算、画出等值网络图，并计算各电压等级侧的短路电流，列出短路电流结果表。从而选择电压互感器、电流互感器、母线、隔离开关等高压电气设备，并根据相关技术条件和短路电流计算结果对所选择的电气设备进行校验。接着进行主变压器保护整定计算，继电保护计算，最后通过计算选择适合的防雷装置和接地装置的配置。力求设计出一个安全、可靠、经济的符合标准要求的现代化变电所。关键词：主接线短路计算电气设备继电保护防雷接地装置110kVPinglesubstationelectricalpartofthepreliminarydesignAbstractWiththedevelopmentofeconomyandtherapidriseofthemodernindustrialconstruction,higherandhigherdemandsonthepowersystem.Substationasanimportantpartofthepowersystem.itdirectlyaffectthesecurityandeconomicoperationoftheentirepowersystem.Thedesignof110kVstep-downsubstationelectricalpartofthepreliminarydesignitneedtoanalysisofrawdatainaccordancewiththerequirementsofthedesigntaskbookandrulesandregulationsofthecountriesconcerned,andthendesigncombinedwiththeactualsituationandconsideringthevision.Frist,thisdesignanalysisoftheload,Computingcapacity,determinethesubstationmainconnectionmodeandselectasuitabletransformercombinedwiththeactualsituation.Resultstableliststheshort-circuitcurrent.Selectthevoltagetransformer,currenttransformers,bus,isolatingswitchandsoon.Checkonthechoiceofelectricalequipmentaccordtotherelatedtechnicalconditionsandshort-circuitcurrentcalculationresults.Thenforthemaintransformerprotectionsettingcalculationandrelayprotectioncalculation.Choosesuitableconfigurationoflightningprotectiondevicesandgroundingdevicebycalculatingatlast.IthopetodesignaSafe,reliableandeconomicmeetthestandardsofmodernsubstation.keywords:MainwiringShortcircuitcalculationElectricalequipmentRelayprotectionLightningprotectionandgroundingdevicesI目录第一章电气主接线设计.........................................................................................................1第一节原始资料分析.....................................................................................................1一、负荷分析...........................................................................................................1二、本设计负荷分析...............................................................................................1第二节主接线设计原则.................................................................................................2一、电气主接线设计的基本要求...........................................................................2二、电气主接线的设计程序...................................................................................3三、设计步骤...........................................................................................................3四、主接线的基本形式...........................................................................................3第三节主接线设计.........................................................................................................4一、110kV侧接线...................................................................................................4二、35kV侧接线.....................................................................................................5三、10kV侧接线.....................................................................................................5第二章变压器的选择.............................................................................................................7第一节主变压器的选择.................................................................................................7第二节原始资料的负荷计算.........................................................................................7一、主变压器容量的确定.......................................................................................7二、计算最大容量...................................................................................................7第三节主变压器的型号选择.........................................................................................8一、相数的选择.......................................................................................................8二、绕组的选择.......................................................................................................8三、绕组接线方式的选择.......................................................................................8四、调压方式的选择...............................................................................................9五、冷却方式的选择...............................................................................................9第三章短路电流计算...........................................................................................................11第一节短路电流计算的概述.......................................................................................11一、短路电流计算的目的.....................................................................................11二、短路电流计算的一般规定.............................................................................11三、短路电流计算的基本假设.............................................................................11第二节短路电流计算.......................................................................................