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重庆水利电力职业技术学院2011届毕业设计论文1摘要展望未来，我国能否在本世纪中叶基本实现现代化，相当大的程度上取决于能源。电力工业是国民经济的基础，是重要的支柱产业，它与国家的兴衰和人民的安康有着密切的关系，随着经济的发展和现代工业的建设的迅速崛起，供电系统的设计越来越全面、系统，工厂用电量迅速增长，对电能质量、技术经济状况、供电的可靠性指标也日益提高，因此对供电设计也有了更高、更完善的要求。变电站作为电能传输与控制的枢纽必须改变传统的设计和控制模式，才能适应现代电力系统、现代化工业生产和社会生活的发展趋势。本设计讨论的是220kV变电站电气部分设计（一次系统），首先根据原始资料进行分析，负荷计算选择主变压器，然后在此基础上进行主接线设计，再进行短路计算，导体和电气设备的选择，最后进行防雷接地设计。关键词：变电站；负荷计算；短路电流；设备选择；重庆水利电力职业技术学院2011届毕业设计论文2ABSTRACTForsatisfyingthedemandthateconomydevelopment,theauthoritiesconcerneddecidetoconstructayanbeitransformersubstation.ThiseugineeringfirststepdesigncontentsincludesthetransformersubstationofelectricDesign.Thenew-etupsaltaYanBeitransformersubstationobtainpowerformDongjiansubstation(110KV).Terearetwokindsoflocalloadsinthesubstation,Oneis35KV,theotheris10KVPassthetechniquetocomparewiththeeconomy,adoptthefollpwingschemenows1.Therearetwothree-windingtransformersinthesubstation,Voltagegradeadopt121KV2.For220KVmainelectricalconnectonsshalladoptinsidebridgeconnection3.The110KVVenterstheline2return,theadoptionbuildstrolleywire4.Fir110KVand10KVmainelectricalconnectionsemploysinglesectionalizedbus5.Auxiliarypowersystemgetpowerformthe10KVsectionalizedbusKeyphrase:ChangetogiveorgetanelectricshockMaintransformerCurrentcalculationShortcircuitcalculationTheequipmentschoosethetype重庆水利电力职业技术学院2011届毕业设计论文3目录摘要...............................................................11引言.............................................................11.1原始资料............................................................................12电气主接线的设计.................................................22.1电气主接线的概述............................................22.2电气主接线的基本要求........................................22.3电气主接线设计的原则........................................22.4电气主接线的方案选择........................................32.4.1方案拟定...............................................32.4.2方案比较...............................................62.4.3方案确定...............................................63负荷计算和主变压器的选择.........................................73.1主变压器的选择原则..........................................73.1.1主变压器台数的选择.....................................73.1.2主变压器容量的选择.....................................73.1.3主变压器型式和结构的选择...............................83.2负荷计算....................................................93.3无功补偿...................................................113.3.1功率因数定义..........................................113.3.2功补偿容量计算........................................113.4主变压器选择结果...........................................134站用电接线及设备用电源接线方案..................................144.1所用电源数量及容量.........................................144.2所用电源引接方式...........................................15重庆水利电力职业技术学院2011届毕业设计论文44.3所用变压器低压侧接线.......................................154.4所站用电接线...............................................164.5备用电源...................................................165电气部分短路计算................................................175.1短路故障的危害175.2短路电流计算的目的.........................................185.3短路电流计算的内容.........................................195.4短路电流计算方法...........................................195.5三相短路电流周期分量起始值的计算...........................205.5.1短路电流计算的基准值..................................205.5.2网络模型..............................................205.5.3三相短路电流周期分量起始值的计算步骤..................206导体和电气设备的选择............................................246.1按正常工作条件选择电气设备.................................246.2按短路状态校验.............................................256.3高压断路器和隔离开关的选择.................................266.3.1高压断路器的选择......................................276.3.2隔离开关的选择........................................286.4220KV侧断路器隔离开关的选择与校验..........................286.4.1主变压器侧断路器的选择与校验..........................286.4.2主变压器侧隔离开关的选择与校验........................296.5110KV侧的断路器隔离开关的选择与校验........................306.5.1主变压器侧断路器的选择与校验..........................306.5.2主变压器侧隔离开关的选择与校验........................316.635KV侧断路器隔离开关的选择与校验...........................326.6.1主变压器侧断路器的选择与校验..........................32重庆水利电力职业技术学院2011届毕业设计论文56.6.2主变压器侧隔离开关的选择与校验........................336.7互感器的选择...............................................346.7.1电流互感器的选择......................................356.7.2电压互感器的选择......................................406.835KV高压熔断器的选择.......................................426.8.1熔断器的选择概述......................................426.8.235kV侧熔断器的选择...................................436.9导体的选择与校验...........................................446.9.1220kV母线选择........................................446.9.2110kV母线选择........................................456.9.335kV母线选择.........................................456.9.4变压器220kV侧引接线的选择与校验......................476.9.5变压器110kV侧引接线的选择与校验......................476.9.6变压器35kV侧引接线的选择与校验.......................487防雷及过电压保护装置设计........................................507.1避雷针.....................................................507.2避雷器.....................................................527.3防雷接地....................................