刘翔毕业设计定稿

南昌工程学院毕业设计(论文)机械与电气工程学院系（院）电气工程及其自动化专业毕业设计（论文）题目某县工业园区110kV降压变电站继电保护设计学生姓名刘翔班级09电气工程及其自动化（2）班学号2009100141指导教师张兴旺完成日期2013年5月28日某县工业园区110kV降压变电站继电保护设计Therelayprotectiondesignabout110kVstep-downsubstationinindustrialparkofthecounty总计毕业设计（论文）47页表格23个插图15幅摘要I摘要电网继电保护用于保护电网及其设备，有鉴于其重要性和技术特点，历来为科研，设计与电网调度运行部门所重视。电网结构、电网运行方式、系统故障形态与异常方式变化多端，为了快速、可靠而又有选择性的切除故障和终止电网的异常状态，长期以来，研究生产了各种线路保护，母线保护以及自动重合闸和低频减载，自动解列等装置，满足电网的需求，为支持大电网的发展，发挥重要的作用。我国的电力工业作为国家非常重要的能源工业，一直都处于优先发展的地位，电力企业的发展也是令人瞩目的。近些年来电力系统的飞速发展对继电保护不断提出新的要求，也使得继电保护得以飞速的发展。本次毕业设计以某县工业园区110kV降压变电站的变压器、输电线路和电气接线方式作为主要原始数据，本设计围绕110kV降压变电站的继电保护设计，根据原始资料所提供的变电站一次系统图，重点介绍变压器的瓦斯保护和差动保护，以及线路的速断保护和过流保护，及其整定的计算内容。通过计算和比较确定了变电站中电气设备的保护和自动装置的初步设计方案和配置选型，同时确定继电保护设计方案。关键字：线路继电保护变压器的继电保护短路计算整定计算AbstractIIAbstractPowerrelayfortheprotectionofpowergridsandequipment,inviewoftheimportanceoftechnicalcharacteristicsandhasalwaysbeenfortheresearch,designandoperationofpowergridschedulingimportancedepartments.Gridstructure,operationmode,systemfailureandabnormalwaysofshiftingpatterns,inordertofast,reliableandselectiveremovaloffailureandabnormalterminationofthestatepowergrid,foralongtimetostudytheproductionofavarietyoflineprotection,busprotectionandautomaticreclosingandunder-frequencyloadshedding,automaticsplittingdevicestomeetthedemandforpowergridstosupportthedevelopmentoflargepowergridsplayanimportantrole.China'spowerindustryasthecountry'smostimportantenergyindustryandhasbeeninprioritydevelopmentofposition,theelectricpowerenterprise'sdevelopmentisremarkable.Inrecentyears,therapiddevelopmentofelectricpowersystemofrelayprotectioncontinuouslyputforwardnewrequirements,butalsomakestherelayprotectiontorapiddevelopment.ThegraduationdesignofStep-downtransformersubstation110kVinindustrialpark,transmissionlineandelectricalwiringwayasmainrawdata,thedesignof110kVsubstationsaroundtherelayprotectiondesign,accordingtoprimitivematerialprovidessubstation,mainlyintroducethefirstsystemchartoftransformerdifferentialprotectionandgasprotection,andwiringinquickbreakprotectionandovercurrentprotection,andsettingcalculationcontent.Throughcalculationandcomparisonidentifiedinthesubstationofelectricequipmentprotectionandautomaticdevicepreliminarydesignschemeandconfigurationselection,determinetherelayprotectiondesign.Keywords:Circuitrelayprotection；transformerofrelayprotection；shortcircuitcalculation；settingcalculation目录III目录摘要......................................................................IAbstract.................................................................II概述.......................................................................1第一章变压器的选择.....................................................31.1概述................................................................31.2绕组数和连接组别的选择..............................................31.3主变容量和台数选择计算..............................................41.4主变压器冷却方式的选择..............................................41.5站用变压器的选择....................................................51.6小结................................................................6第二章电气主接线的选择................................................72.1概述................................................................72.2主接线设计的设计依据................................................72.3主接线设计的基本要求................................................72.3.1可靠性.........................................................72.3.2灵活性.........................................................82.3.3经济性.........................................................82.4主接线方案的选择比较...............................................82.4.1110kV侧电气主接线.............................................82.4.235kV电气主接线...............................................102.4.310kV主接线...................................................112.5小结................................................................12第三章短路电流计算..................................................133.1短路电流计算的目的.................................................133.2变压器电抗.........................................................13目录IV3.3线路电抗...........................................................143.3.1110kV侧d1点短路电流计算.....................................143.3.235kV侧d2点短路电流计算......................................153.3.310kV侧d3点短路电流计算......................................163.4小结...............................................................19第四章电气设备选择与校验............................................204.1高压断路器的选择与校验..............................................204.1.1断路器使用的技术条件：........................................204.1.2110kV侧断路器：..............................................204.1.335kV断路器：.................................................224.1.410kV断路器：.................................................234.2隔离开关的选择与校验..............................................254.2.1隔离开关使用的技术条件........................................254.2.2110kV隔离开关................................................254.2.335kV侧隔离开关的选择.........................................264.2.410kV侧隔离开关的选择.........................................274.3母线的选择与校验.....