摘要厂总降压变电所是工厂供配电的重要组成部分，它直接影响整个工厂供电的可靠运行，起着接受和分配电能的作用。其中电气主接线是总降压变电所的主要环节，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，是决定变电所电气部分技术经济性能的关键因素。本设计根据降压变电所及高压配电系统的设计线路，首先进行车间负荷计算和无功功率补偿，确定主变压器容量台数及各车间变压器；其次从技术和经济方面，根据经济、可靠、运行灵活的原则通过了三种方案的比较，确定了单母线分段供电方式;又进行了厂区10KV配电系统设计。再次，进行短路计算；然后，根据计算结果进行电气设备的选择。最后，进行了整定继电保护、防雷保护和接地装置的设计。设计结果可以满足精密机械厂供电的可靠性，并保证各车间电气设备的稳定运行。关键词：负荷计算,主接线设计，短路计算，配电装置AbstractThetotalstep-downsubstationplantisanimportantpartofpowersystem.Ithasadirectimpacttoreliableoperationoftheertirepowersystemoffactrory,whichisalsorelatesthepowerplantanduser'smiddlelink,playstheroleofshiftingandassigningelectricenergy.Thehostconnectiondirectlyrelatedtothechoiceofelectricalequipmentthelayoutofpowerdistributionequipment,andoutmaticprotectiondevicesidentifiedofthewholeplan,whichisthekeyfactordecidingsubstationelectricalparttechnicaleconomydirectly.Thisdesignisaboutstep-downhigh-voltagesubstationanddistributionsystem.First,itcarriesontheworkshoploadstatisticsandthereactivepowercompensation,definitemaintransformerandvariousworkshopstransformer;Fromaspectsandsoontechnologyandeconomy,adoptedtwokindofplancomparisons,thechoiceeconomically,reliable,themovementnimblemainwiringfirstpowerdocument.Next,itcarriesontheshortcircuitcomputationandequipment'schoice,theverification;Thendeterminesthefactorypowersourcecoil,thebusbarandthehighpressuredistributionline.Finally,itcarriesonthesecondarycircuitplan,theinstallationrelayprotection,theanti-radarprotectionandthegroundingdesign.Thedesignresultmaysatisfythejingyimechanicalrepairshoppowersupplythereliability,andguaranteesthevariousworkshopselectricalequipment'ssteadyoperation.Keywords：Loadcalculation,Mainwiringdesign,Short-circuitcalculation,DistributionDevice目录TOC\o"1-2"\h\uHYPERLINK\l_Toc15148第一章绪论PAGEREF_Toc151481HYPERLINK\l_Toc165501.1工厂供电的意义和要求PAGEREF_Toc165501HYPERLINK\l_Toc185181.2工厂供电设计的一般原则PAGEREF_Toc185181HYPERLINK\l_Toc194821.3本次供电设计的主要内容PAGEREF_Toc194822HYPERLINK\l_Toc30311