电气工程及其自动化专业毕业设计论文--110kV区域变电站电气部分设计(最终55)

-1-四川大学成人教育学院本科生(函授)毕业论文（设计）题目110kV变电站一次部分电气设计办学学院四川大学教学部西藏函授站专业电气工程及其自动化年级2014级指导教师魏振波学生姓名王志永学号201414010212016年5月3日-2-摘要学生：王志永指导教师：魏振波变电站作为电力系统中的重要组成部分，直接影响整个电力系统的安全与经济运行。本论文中待设计的变电站是一座降压变电站，在系统中起着汇聚和分配电能的作用，担负着向该地区工厂、农村供电的重要任务。该变电站的建成，不仅增强了当地电网的网络结构，而且为当地的工农业生产提供了足够的电能，从而达到使本地区电网安全、可靠、经济运行的目的。本论文《110kv变电站一次部分电气设计》，首先通过对原始资料的分析及根据变电站的总负荷选择主变压器，同时根据主接线的经济可靠、运行灵活的要求，选择了两种待选主接线方案进行了技术比较，淘汰较差的方案，确定了变电站电气主接线方案。其次进行短路电流计算，从三相短路计算中得到当短路发生在各电压等级的母线时，其短路稳态电流和冲击电流的值。再根据计算结果及各电压等级的额定电压和最大持续工作电流进行主要电气设备选择及校验（包括断路器、隔离开关、电流互感器、电压互感器等）。最后，并绘制了电气主接线图、电气总平面布置图、防雷保护配置图等相关设计图纸。关键词电气主接线设计；短路电流计算；电气设备选择-3-AbstractPowersystemsubstationasanimportantpartoftheentirepowersystemdirectlyaffectsthesafetyandeconomicoperation.Tobedesignedinthispaperisastep-downsubstationsubstationinthesystemplaystheroleofaggregationanddistributionofelectricenergy,chargedwiththefactorytotheregion,theimportanttaskofruralelectrification.Thecompletionofthesubstationwillnotonlystrengthenthelocalpowergridnetworkstructure,butalsoforthelocalindustrialandagriculturalproductionprovidesenoughpower,sothattheregionalpowergridsoastoachievesafe,reliableandeconomicoperationpurposes.Thepaper110kvsubstationoncepartoftheelectricaldesign,thefirstoriginaldatathroughtheanalysisandselectionbasedontotalloadofthesubstationmaintransformer,themainwiringunderbotheconomicalandreliable,flexibleoperationrequirements,selectthemainconnectionoftwoprogramstobeselectedAtechnicalcomparison,outofpoorprogramtodeterminethemainelectricalsubstationconnectionprogram.Second,theshort-circuitcurrentcalculation,obtainedfromthethree-phaseshortcircuitcalculationoccurswhenshort-circuitthevoltagelevelofthebus,itssteady-statecurrentandtheimpactofshort-circuitcurrentvalue.Accordingtotheresultsandthevoltagelevelofvoltageandmaximumcontinuousoperatingcurrentofthemainelectricalequipmentselectionandvalidation(includingcircuitbreaker,disconnectingswitch,currenttransformer,voltagetransformer,etc.).Finally,themaindrawoftheelectricalwiringdiagram,electricalgenerallayoutmap,lightningprotectionandotherrelateddesignlayoutplandrawings.keywordsElectricalmainwiringdesign;short-circuitcurrentcalculation;electricalequipmentselection;designdrawings1目录第一章设计的内容和要求...............................................................................................................................1一、原始资料分析.......................................................................................................................................1二、设计原则和基本要求.........................................................................................................................2三、设计内容.............................................................................................................................................2第2章主变压器的选择.....................................................................................................................................3一、主变台数的确定...................................................................................................................................3二、本变电站站用变压器的选择...............................................................................................................4三、小结.......................................................................................................................................................5第3章电气主接线的选择.................................................................................................................................6一、选择原则...............................................................................................................................................6二、主接线的基本形式和特点...................................................................................................................7三、变电站的各侧主接线方案的拟定.....................................................................................................7四、小结.....................................................................................................................................................11第4章短路电流计算.......................................................................................................................................12一、短路计算的目的及假设.....................................................................................................................12二、短路电流计算的步骤.........................................................................................................................12三、短路电流计算及计算结果.................................................................................................................13四、小结.....................................................................................................................................................17第5章导体和电气设备的选择.......................................................................................................................18一、电气设备的选择原则.........................................................................................................................18二、断路器和隔离开关的选择............................