35kv变电站电气部分设计毕业设计

1郑州航空工业管理学院毕业论文（设计）2013届电气工程及自动化专业班级题目35kv变电站电气部分设计姓名学号指导教师职称二○一三年五月十二日2内容摘要变电站是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济运行，是联系发电厂和用户的中间环节，起着变换和分配电能的作用。电气主接线是发电厂变电所的主要环节，电气主接线的拟定直接关系着全厂电气设备的选择、配电装置的布置、继电保护和自动装置的确定，是变电站电气部分投资大小的决定性因素。变电站是把一些设备组装起来，用来切断、接通、改变或者调整电压的。在系统中，变电站成了输电和配电的集节点。本次设计首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了35kV，10kV以及站用电的主接线，然后又通过负荷计算及供电范围确定了主变压器台数，容量及型号，同时也确定了站用变压器的容量及型号，并进行了短路电流计算等内容，从而完成了35kV电气一次部分的设计。关键词主变压器；电气主接线；短路电流；电气设备3AbstractAsubstationistheelectricalpowersystemimportantconstituent,itaffectstheentireelectricalpowersystemdirectlythesecurityandtheeconomicalmovement,isrelatesthepowerplantanduser'smiddlelink,isplayingthetransformationandtheassignmentelectricalenergyrole.Theelectricalhostwiringisthepowerplanttransformersubstationkeylink,theelectricalhostwiringdrawsupisrelatingtheentirefactorydirectlytheelectricalequipmentchoice,thepowerdistributionequipmentarrangement,therelayprotectionandtheautomaticdevicedetermination,isthetransformersubstationelectricitypartinvestmentsizedeterminingfactor.Thetransformersubstationisassemblessomeequipment,usesfortoshutoff,theconnection,thechangeortheregulationvoltage.Inthesystem,thetransformersubstationhasbecometheelectrictransmissionandthepowerdistributioncollectionnode.Thisdesignfirstactsaccordingtointheprojectdescriptiontogivethesystemlogicalcircuitandallloadparameter,theanalysisloadtrendofdevelopment.Hadexpoundedfromtheloadgrowthaspectthestationconstructionnecessity,thenthroughtoplanstoconstructthetransformersubstationthesummaryaswellasthegoingbeyondalinedirectionconsidered,andthroughtoshouldersthematerialtheanalysis,safe,theeconomyandthereliableaspectconsidered,haddetermined35kV,10kVaswellasthestationuseelectricitythemainwiring,thencalculatedthroughtheloadandsuppliespowerthescopetodeterminethemaintransformerTaiwannumber,thecapacityandthemodel,simultaneouslyalsohaddeterminedstoodwithcontentsandsoontransformercapacityandmodel,thushascompleted35kVelectricitypartialdesigns.KeywordsMaintransformer，Singlebusbarsegmentwiring，Shortoutinthe-electriccurrent，Electricequipment4目录第1章概述.....................................................................6第2章设计任务及要求............................................................82.1设计任务...................................................................82.2设计要求...................................................................82.2.1技术要求...............................................................82.2.2设计内容...............................................................8第3章变电站的总体设计分析.....................................................103.1变电站的主要设备组成......................................................103.2负荷分析..................................................................103.3变电站主接线方案的确定....................................................113.4主变压器选择..............................................................123.4.1主变台数的考虑原则....................................................123.4.2变压器容量的确定......................................................123.4.3调压方式的确定........................................................133.4.4容量比................................................................133.4.5主变压器的参数计算....................................................13第4章短路电流计算.............................................................154.1短路电流的目的及其假定....................................................154.1.1短路电流计算的目的....................................................154.1.2基本假定..............................................................154.2基准值计算................................................................154.2.1计算短路电路中各元件的电抗及总电抗....................................164.2.2计算三相短路电流和短路容量............................................17第5章电气设备的选择...........................................................205.1电气设备选择的基本原则....................................................205.2断路器....................................................................205.2.135KV侧断路器的选择...................................................205.2.2选择校验..............................................................205.2.310KV侧出线断路器及分段断路器的选择...................................215.2.4选择校验..............................................................215.3隔离开关..................................................................225.3.135KV侧隔离开关的选择.................................................225.3.210KV侧隔离开关的选择.................................................235.4电流互感器的选择..........................................................245.4.1电流互感器的初选......................................................245.4.2电流互感器的校验......................................................255.4.3电压互感器的选择......................................................265.5母线的选择................................................................275.5.135KV母线的选择.......................................................2755.5.210KV母线的选择.......................................................295.6避雷器的选择....................................................