电气工程变电站毕设完整版

摘要煤炭能源是国民经济发展中重要的因素之一。煤炭在我国一次能源生产和消费结构中占据70%以上的比例。并且随着国民经济的讯速发展和工业现代化的不断推进，对电力系统的需求也不断提高。因此对于电力系统的重要组成部分——变电站也要不断更新。本设计对35kv四老沟煤矿地面变电站进行了全面的改进和设计。本设计对四老沟矿包的自然气候地理环境等因素进行详细分析，来确定变电所位置和供电电源；对电气主接线的选择、高压设备的选择与校验、负荷计算、短路电流计算，各种继电保护整定计算和选择皆有详细的说明。特别对主结线的选择，变压器的选择，还有一些电气设备如断路器、电压互感器、电流互感器等的选择校验作了仔细的分析和说明。最后进行了变电站的运行维护。关键词：35kv变电站、主结线选择、计算负荷、短路电流、运行维护、高压电气设备选择；ABSTRACTPositiveenergyisoneofthemostimportantfactorinthedevelopmentofnationaleconomy.CoalinprimaryenergyproductionandconsumptionstructureinChinahasoccupiedmorethan70%oftheproportion.Andwiththerapiddevelopmentofnationaleconomyandtheadvancementofindustrialmodernization,totherequirementofpowersystemalsocontinuetoimprove.Soforthepowersystemisanimportantpartofsubstationwillbeconstantlyupdating.Thisdesignforthesilaogou35kvtransformersubstationcomprehensivedesignandimprovement.Thisdesigntothesilaogoupackageofgeographicalenvironment,climateandothernaturalfactorsareanalyzed,Todeterminethepowersupplyandsubstationlocation;Themainconnectionofchoice,thechoiceofhigh-voltageequipment,loadcalculation,short-circuitcurrentbasis,theprotectionofvariousoptionsandsettingcalculationtherearedetailedinstructions,inparticularthechoiceofthemaincable,choice,therearesomeelectricalequipmentsuchascircuitbreakers,currenttransformers,highvoltagetransformer,andsothechoiceofcheckingadetailedanalysis.Keywords:35kvsubstation；themainconnectionofchoice；loadcalculation,short-circuitcurrentbasis；lightningprotectiongrounding；Thechoiceofelectricalequipment.目录1、供电电源及供电方式的确定....................................................................................................11.1矿井概述：........................................................................................................................11.1.1自然地理环境.........................................................................................................21.2变电所位置........................................................................................................................21.2.1变电所设置.............................................................................................................21.3供电电源确定....................................................................................................................31.3.1电源确定.................................................................................................................32、变电所负荷统计与主变压器的选择........................................................................................72.1矿井电力负荷统计........................................................................................................72.2无功功率...........................................................................................................................72.2.1全矿补偿前自然功率因素....................................................................................72.2.2拟定Cosφ提高到0.95..........................................................................................72.2.3总补偿功率............................................................................................................72.2.4补偿后的功率因数................................................................................................72.3主变压器选择....................................................................................................................72.3.1容量计算................................................................................................................72.3.2无功补偿后主变压器损耗....................................................................................92.3.3总计算负荷............................................................................................................93、短路电流计算............................................................................................................................93.1计算短路电流的目的和任务............................................................................................93.1.1研究短路电流的目的.............................................................................................93.1.2研究短路电流的任务.............................................................................................93.2确定基准值.....................................................................................................................103.3计算短路中各主要元件的电抗标么值.........................................................................103.3.135kV侧架空线的标么值.....................................................................................103.3.2变压器的电抗标么值..........................................................................................103.3.3电缆线路电抗标么值..........................................................................................103.4各点短路总电抗标么值及三相短路电流.....................................................................113.4.135kV母线短路电流............................................................................................123.4.210kV母线短路电流............................................................................................133.4.3主井电缆短路电流...........................................................................