某煤矿厂降压变电站的设计XXX

绵阳师范学院本科生毕业设计（论文）题目某煤矿厂降压变电站设计——向阳煤矿专业电气工程及其自动化院部物理与电子工程学院学号XXXXXXXXXX姓名XXXXXX指导教师XXXXXX教授答辩时间二0一二年五月论文工作时间：2011年12月至2012年5论文题目来源：国家自然科学基金项目编号：四川省自然科学研究项目编号：校级自然科学研究项目编号：某煤矿厂降压变电站的设计——向阳煤矿学生：XX指导教师：XX摘要:煤矿厂供电系统就是将35kv电压先降压再分配到各厂房和矿井中去，它主要由总降压变电站，高压配电线路，各车间变电所，低压配电线路及用电设备组成。总降压变电站及配电系统的设计，是根据每个车间的负荷和性质，生产工艺对负荷的要求,及负荷布局，再结合国家供电要求，解决对各厂房和矿井的安全可靠，经济技术地供配电问题。基本内容有这几个方面：进线电源的选择,主变配电所位置的选择和电气设计,短路电流的计算，二次继电保护,电气设备的选择与校验,各变电所位置，变压器数量及容量的选择,防雷接地装置地设计等。关键词：煤矿厂；供配电；变电站；35kvCoalMineFactoryStep-downsubstationdesign——XiangyangCoalMineFactoryUndergraduate:XXSupervisor:XXXAbstract:Factory'selectricitypowersupplysystemisworkingbysteppingdownthevoltageof35kv,andthendistributeittoeachplantormine,whichconsistsstep-downsubstationplant,highvoltagepowerdistributionlines,plantssubstation,low-voltagedistributionlinesandelectricalequipments.Thedesignofthemainsubstationplantanddistributionsystemisbasedontheloadandthecharacterofeachplant,therequirementsoftheproductionprocesstotheload,andthelayoutoftheload.Andmustcombinethenationalpowersupplysituationtoaddressthevariousdepartments'distributionofpowerproblems,whichmustbesafeandreliable,economicalandtechnical.Thebasicelementsare:thechoiceofthevoltageline,thelocationthemainvariabledistributionandtheelectricaldesign,short-circuitcurrentcalculation,relayprotection,electricalequipmentselectionandchecking,variabledistributionplants'location,theoptionoftransformersubstations'numberandcapacity,andearthingdesignoflightningprotection.Keywords:Factory;supplyanddistribution;DistributionSystem;35kv目录1绪论.............................................................................................................................11.1煤矿厂供电的基本要求..................................................................................11.2变电站的发展状况..........................................................................................11.3设计的要求和内容..........................................................................................12原始资料.....................................................................................................................22.1煤矿厂平面分布图...........................................................................................22.2煤矿厂负荷情况...............................................................................................32.3煤矿厂供电电源情况.......................................................................................33负荷计算和主变压器的选择.....................................................................................43.1负荷分析...........................................................................................................43.2负荷计算...........................................................................................................43.2.1单组用电设备负荷计算公式...............................................................43.2.2多组用电设备负荷计算公式...............................................................43.2.3单组用电设备负荷计算.......................................................................53.2.4多组通电设备即变电所总负荷计算...................................................73.3无功功率的补偿...............................................................................................83.3.1无功功率补偿简述...............................................................................83.3.2电容器补偿容量的计算.......................................................................84主变电站的选址.........................................................................................................94.1变电站站址选择的一般原则[3].......................................................................94.2变电站位置的选择...........................................................................................95变电所主变压器及主接线方案的选择...................................................................105.1变电所主变压器的选择.................................................................................105.1.1主变压器台数的选择.........................................................................105.1.2主变压器容量的确定.........................................................................105.2变电所主接线方案的选择.............................................................................115.2.1主接线的概述[4]..................................................................................115.2.2主接线方案的设计原则与要求[4]......................................................115.2.3变电所主接线方案的比较与选择.....................................................116短路电流的计算.......................................................................................................136.1短路电流的计算.............................................................................................136.1.1确定基准值.........................................................................................136.1.2计算短路电路中各阻抗元件的标幺值.............................................136.1.3最大运行方式下短路电流的计算.....................................................146.1.4最小运行方式下短路电流的计算.....................................................146.1.5在2S点发生短路时，冲击短路电流的计算....................................157电气设备的选择与校验.....................................................