I某矿区35kv/10kv变电站设计摘要矿井变电站的设计非常重要,本文针对变压器的选择和变电站负荷计算、电气设备的电气主接线设计、短路电流计算、各种设备的确定和检查,配电室的装设继电保护方案以及制定和设置变电站保护和接地保护展开了设计。重点说明了电气主接线设计方案和选择变压器台数以及容量,一些电气设备如断路器,电流互感器,电压互感器等的确定和检查详细的描述和分析。文中变电站电气主接线,平面布局,一些高压侧和低压侧保护装置显示通过一个直观的CAD图纸描述出来的。变电站的设计更科学和人性化通过配电室中的电力监控系统,可以让值班人员更好的了解和掌握变电站中的运行情况;如果设备出现故障可以直接对设备进行操作并且能很快的处理问题使变电站变配电不至于中断,不会影响到工厂的运行,能够有效的输送电能。关键词:短路电流计算;继电保护;断路器IIAbstractSubstationminedesignisveryimportant,thepaperloadiscalculatedfortheselectionandsubstationtransformers,relayprotectionschemeforidentifyingandcheckingtheinstallation,powerdistributionroomElectricmainwiringdesignofelectricalequipment,short-circuitcurrentcalculation,variousdevicesandtodevelopandSetsubstationprotectionandgroundingprotectionlaunchedadesign.Highlightsthemainelectricalwiringdesignandselectthenumberoftransformerstationsandcapacity,someoftheelectricalequipmentsuchascircuitbreakers,currenttransformers,voltagetransformersandotheridentifyingandcheckingthedetaileddescriptionandanalysis.Substationelectricalwiringinthemaintext,layout,someofthehighsideandlowsideprotectiondevicedisplaysanintuitiveCADdrawingsdescribeout.Substationdesignmorescientificandhumanedistributionchamberthroughpowermonitoringsystemthatallowsdutypersonneltobetterunderstandandmastertheoperationofthesubstation;ifthedevicefailstooperatetheequipmentcanbedirectlyandquicklyprocessingProblemsmakepowerdistributionsubstationnotinterrupted,willnotaffecttheoperationoftheplant,caneffectivelyconveyelectricity.Keywords:Calculationofshort-circuitcurrent;Relayprotection;Circuitbreaker目录摘要.............................................................IAbstract.........................................................II1绪论............................................................12负荷计算........................................................22.1负荷分级.....................................................22.2矿井负荷计算.................................................22.3功率补偿.....................................................83主变压器的选择.................................................103.1变压器台数的选择............................................103.2变压器选择计算.............................................104电气主接线的设计...............................................124.1电气主接线的设计原则和要求.................................124.1.1电气主接线的设计原则....................................124.1.2电气主接线设计的基本要求................................124.2变电站的主接线方式..........................................134.3本所主接线方案..............................................154.3.1电气主接线方案比较......................................155短路电流计算...................................................175.1短路电流计算的一般概述.....................................175.2短路回路参数的计算.........................................185.2.1标么值..................................................185.2.2短路回路中各元件阻抗的计算..............................185.3短路电流的计算过程..........................................216电气设备的选择和校验...........................................246.1确定高压电器的方式..........................................246.2母线的选择..................................................256.2.135KV母线的选择.........................................256.2.210KV母线的选择.........................................256.3电气设备的选择..............................................266.3.1断路器的选择............................................266.3.2高压隔离开关的选择......................................286.3.3电流互感器的选择........................................296.3.4电压互感器的选择........................................316.2.5高压熔断器的选择........................................316.2.6开关柜的选择............................................327变电所的平面布置...............................................347.1变电所位置确定原则..........................................347.2配电室建筑要求.............................................347.3控制室布置................................................348变电所的防雷保护及接地装置.....................................368.1直击雷过电压保护............................................368.2本设计中避雷针的选择.......................................378.3打雷造成的过电压保护........................................379继电保护.......................................................399.1概述.......................................................399.1.1变压器的瓦斯保护.......................................399.1.2变压器的过电流保护......................................399.1.3变压器的差动保护........................................39结束语...........................................................40致谢..........................................................41参考文献.........................................................42附录:英文翻译...................................................43华北科技学院毕业设计第1页共49页1绪论现在,随着现代工业的发展,工业对供电系统可靠性和供电系统的稳定性的要求越来越高。电能在工业中的作用是非常重要的,变电站作为接受和分配电能更是在工业中占据非常重要的地位;因此,分析和设计是一个非常重要的任务作为变电站的发展。大部分的变电站供电系统被用于在电源电压35KV上,通过主变电站和变电站车间两级变压。35KV电压经过主变电站降为10KV电压,再由配电线路引到车间变电站,然后10KV变电站的电压变低电压到220V/380V/660V的电压供电气设备使用。任家庄煤矿供电系统由两个35KV线路供电。这两个进线到变电站是两个35/10kv的主变压器,通常使用一个主变压器,另外一个备用变压器。矿井年产量:240万吨服务年限:50年两回35kV架空电源线路长度:1l=2l=km4;KV35侧系统电抗最大运行方式下:minXx=0.23(Sj=100MVA);KV35侧系统电抗在最小运行方式下:maxXx=0.31(Sj=100MVA);KV10侧要求补偿后功率因数为COS=0.9。自然条件任家庄煤矿位于平原地区