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220KV变电站电气主接线系统设计I摘要本说明书以220KV地区变电站设计为例，论述了电力系统工程中变电站部分电气设计（一次部分）的全过程。通过对变电站的主接线设计，站用电接线设计，短路电流计算，电气设备动、热稳定校验，主要电气设备型号及参数的确定，运行方式分析，防雷及过电压保护装置的设计，电气总平面及配电装置断面设计和无功补偿方案设计，较为详细地完成了电力系统中变电站设计。限于毕业设计的具体要求和设计时间的限制，本毕业设计只对变电站电气一次部分做了较为详细的理论设计，而对其电气二次部分并没有涉及，这有待于在今后的学习和工作中进行研究。关键词：变电站短路电流动稳定热稳定过电压保护装置无功补偿220KV变电站电气主接线系统设计IIABSTRACTThestatementaboutthe220kvtransformerareasubstationdesign,discussedsomeelectricaltransformerstationsdesign(onepart)inpowersystemsengineeringoftheentireprocess.Throughthemaintransformerstationswiringdesign,stationswiringdesignstations,shortcircuitcurrentcalculations,checkelectricalequipmentmovingandthermalstability,setthemainelectricalequipmentmodelsandtheparameters,theoperatingmode,designover-voltageprotectionandminedevices,designgeneralelectricgraphicanddistributiondevicesflood,andwithoutpowercompensation.Lastly,completedsubstationdesigninpowersystem.Limitedtothespecificdesignrequirementsanddesigntimeofconstraints,Thedesignonlyisapartoftheelectricaltransformerstations,anditssecondpartdidnotinvolve,whichresearchitinfuturestudyandwork.KEYWORDS:Substation,Shortcircuitcurrents,Movingstability，Thermalstability，Over-voltageprotectiondevices，Withoutpowercompensation220KV变电站电气主接线系统设计III目录摘要..................................................................IABSTRACT...............................................................II第1章引言.............................................................2第2章.主接线设计......................................................3·2.1电气主接线的一般要求..............................................3·2.2主接线选择的主要原则..............................................4·2.3主接线方案设计....................................................4·2.3.1方案拟定及技术比较...........................................4·2.3.2方案的经济性比较.............................................6·2.3.4主变的选择...................................................10·2.3.4.1选择原则..............................................10·2.3.4.2容量计算.................................................11第3章站用电接线及设备用电源接线方案..................................13·3.1所用电源数量及容量...............................................13·3.2所用电源引接方式.................................................13·3.3所用变压器低压侧接线.............................................14·3.4所站用电接线.....................................................14·3.5备用电源.........................................................14第4章短路计算........................................................15·4.1短路故障产生的原因...............................................15·4.2短路故障的危害...................................................16·4.3短路电流计算的目的...............................................17·4.4短路电流计算的内容...............................................17·4.5短路电流计算方法.................................................18·4.6三相短路电流周期分量起始值的计算.................................18·4.6.1短路电流计算的基准值.........................................18·4.6.2网络模型.....................................................18·4.6.3三相短路电流周期分量起始值的计算步骤.........................18第5章设备的选择及动、热稳定校验.....................................23·5.1.按正常工作条件选择电气设备......................................23·5.2.按短路状态校验..................................................24·5.3断路器、隔离开关的选择原则.......................................25·5.4.互感器的选择....................................................28·5.4.1电流互感器的选择.............................................28·5.4.2电压互感器的选择............................................30·5.4.3熔断器的选择................................................30·5.4.4所设备如下表.................................................32·5.5.裸导体的选择...................................................33220KV变电站电气主接线系统设计IV·5.5.1一般要求:..................................................34·5.5.2导体的选择...................................................34·5.5.3截面的选择..................................................34·5.6.运行方式分析..................................................37第6章配电装置........................................................39·6.1配电装置的基本要求:..............................................39·6.2配电装置的类型及特点.............................................39·6.3配电装置的设计原则...............................................40·6.4配电装置设计的基本步骤...........................................41·6.5配电装置的选用...................................................41·6.6电气总平面布置...................................................43第7章防雷及过电压保护装置设计........................................44·7.1避雷针...........................................................44·7.2避雷器...........................................................45·7.3防雷接地.........................................................46·7.4变电所的防雷保护.................................................47·7.5变电所的进线段保护...............................................48·7.6接地装置.........................................................48第8章无功补偿........................................................49·8.1提高功率因数的意义...............................................49·8.2补偿装置的确定：.................................................49·8.3功补偿容量计算...................................................50·8.3.1补偿的最