60kV降压变电所电气部分设计

编号毕业设计(论文)60kV孙家降压变电所电气部分设计Designof60kVslipsstep-downsubstationelectricalpart学院名称新能源学院专业名称电气工程及其自动化学生姓名学号指导教师教授2015年6月20日本科生毕业设计（论文）I摘要随着社会现代化建设的飞速发展,近年来城市电网建设力度亦随之加大,各地区不同电压等级变电所的建设已成为电力行业中非常重要的一项建设发挥着重要的作用。本毕业设计论文是60kV孙家降压变电所电气部分设计。为了保证供电的可靠性和一次性满足远期负荷的要求，按照远期负荷规划进行设计建设，从而保证变电所能够长期可靠供电首先采用需要系数法，直接求出有功负荷、无功负荷和视在功率负荷。应用计算负荷结果最终确定两台20000kVA变压器作为主变，以及无功补偿值为3742kVar。电气主接线是通过对两种主接线的经济性、可靠性以及优缺点的比较，得出最适合本所要求的主接线。短路电流计算中主要选择了高压侧、低压侧和负荷侧三个短路点进行计算。在正常工作状态下进行电气设备（断路器、隔离开关、电流互感器、电压互感器、母线和避雷针）选择，按短路条件校验电气设备的动稳定和热稳定。高压配电装置中高压侧选择采用屋外配电装置。之后进行变压器的继电保护和防雷保护，变压器继电保护进行瓦斯保护和差动保护计算，防雷保护采用了避雷针进行保护。关键词：变电所；短路计算；电气主接线；设备选择；继电保护本科生毕业设计（论文）IIAbstractWiththerapiddevelopmentofsocialmodernization,andinrecentyears,thecitypowergridconstructionalsoincreased,theareaofdifferentvoltagegradechangeelectricconstructionhasbecomeveryimportantinthepowerindustrytoabuildingplaysanimportantrole.Thisgraduationdesignthesisisthedesignoftheelectricalpartofthe60kVsun'shouseofthebucksubstation.Inordertoensurethereliabilityofthepowersupplyandmeettherequirementsoflong-termload,accordingtothelong-termloadplanningtodesignandconstruction,soastoensurethatthepowersupplycanbelong-termreliablepowersupplyFirstly,theactiveload,reactiveloadandapparentpowerloadareobtainedbyusingthecoefficientmethod.Theapplicationofcalculationloadresultsinthefinaldeterminationoftwo20000kVAtransformerasthemaintransformer,andreactivepowercompensationvalueis3742kVar.Electricmainwiringisthroughthetwomainwiringoftheeconomy,reliabilityandthecomparisonoftheadvantagesanddisadvantagesofthemainwiring.Inthecalculationoftheshortcircuitcurrent,thethreeshortcircuitpointsofthehighvoltageside,thelowpressuresideandtheloadsidearechosen.Underthenormalworkingconditionofelectricalequipment(suchascircuitbreaker,isolatingswitch,currenttransformer,voltagetransformer,busandthelightningrod)choice,short-circuitconditionscheckelectricalequipmentaccordingtothedynamicstabilityandheatstability.Thehighvoltagesideofthehighvoltagedistributiondeviceadoptsthepowerdistributiondeviceoutsidethehouse.Afterthetransformerprotectionandlightningprotection,transformerprotectionforgasprotectionanddifferentialprotection,lightningprotectionfortheuseoflightningrodprotection.Keywords:substation;short-circuitcalculation;electricalmainwiring;equipmentselection;relayprotection本科生毕业设计（论文）III目录第1章绪论..................................................................................................................11.1变电所概述........................................................................................................11.2本文设计内容....................................................................................................1第2章负荷分析计算....................................................................................................32.1负荷计算的内容和目的....................................................................................32.2负荷计算............................................................................................................3第3章无功补偿及主变压器的选择............................................................................53.1提高功率因数的意义和作用、补偿方式........................................................53.2无功补偿计算....................................................................................................63.3主变器的确定....................................................................................................7第4章电气主接线设计................................................................................................94.1主接线设计的基本要求....................................................................................94.2电气主接线的选择..........................................................................................10第5章短路电流计算..................................................................................................155.1短路概述..........................................................................................................155.2短路计算.........................................................................................................17第6章电气设备的选择及校验..................................................................................216.1高压电器选择的一般要求..............................................................................216.2断路器的选择与校验......................................................................................246.2.1高压侧断路器的选择与校验...............................................................246.2.2变压器10kV侧入口处断路器选择与校验.........................................246.3隔离开关的选择与校验..................................................................................256.3.1高压侧隔离开关的选择与校验..........................................................256.3.2变压器10kV侧出口隔离开关选择与校验.........................................266.4互感器的选择与校验......................................................................................276.4.1电压互感器的选择与校验...................................................................276.4.2电流互感器的选择与校验...................................................................276.5母线的选择与校验................................