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I摘要电力系统是国民经济的重要能源部门，而变电所的设计是电力工业建设中必不可少的一个项目。由于变电所的设计内容多、范围广、逻辑性强，因此要求要有较高的专业水平，并熟悉各种设计规程和设计原理，设计过程中要针对变电所的规模和形式，具体问题具体分析。本文是对大北60kv/10kv二次降压变电所提供的设计方案，设计分为两部分。第一部分说明书中包括了对原始设计条件的分析，导线的选择，无功补偿静电电容器的选择，主变压器的选择，电气主接线的确定，短路计算，各种电气设备的选择与校验，高压配电装置的规划设计，防雷保护的规划设计。在设计和选择设备中都充分考虑到了可靠性，灵活性和经济性。另外，各种断路器、隔离开关、电流互感器型号的选择要与高压配电装置的布置联系在一起考虑。计算书部分包括了计算变电所的最大负荷容量，无功补偿的计算，计算主变压器的容量，化简短路阻抗和计算短路电流，电气设备的校验，和防雷保护保护范围的计算。本设计是有文字说明和图表解释的比较完整的二次降压变电所的设计方案。关键词电力系统，电气设备，变压器，继电保护IIAbstractTheelectricalpowersystemisthenationaleconomyimportantenergydepartment,butthetransformersubstationdesignisintheelectricpowerindustryconstructionanessentialproject.Becausetransformersubstationdesigncontentmany,scopebroad,logical,thereforerequeststohavetohavethehighspecializedlevel,andthefamiliareachdesignregulationsandtheprincipleofdesign,inthedesignprocessmustaimatthetransformersubstationthescaleandtheform,concretequestionconcreteanalysis.Thecontentquitearemany,thescopeisbroad,differentvoltagerank,differenttype,whenheterogeneityloadtransformersubstationdesignstressestheaspectisdissimilar.Thisbookisaboutmishan60/10KVTransformerStationDesignofElectricPortion.Thedesignisdividedintotwoparts.Thefirstpartdescriptionincludeddesignedconditionalanalysistotheoriginality,thechoiceoftransmissionline,staticcapacitorandmaintransformer,keydiagramfinalized,ect.highpressureintransformersubstain,Inallofthedesigntheequipmentschoiceinconsiderationofreliability,flexibilityandeconomy.Moreover,allofthecircuitbreaker,disconnectingswitch,electriccurrentthechoiceoffeelingmachinemodelnumberwanttogotogetherwiththedecorationofgivingorgettinganelectricshockthedevicewithhighpressuretocontacttotogetherconsiderwitheachother.Calculationsincludethecalculationofthemaximumloadcapacityofsubstations,reactivepowercompensation,thecalculationofmaintransformercapacity,ashortwayofcalculatingtheimpedanceandshort-circuitcurrent,electricalequipmentcheck,andthescopeofprotectionlightningprotectioncalculations.Thedesignisatextdescriptionandacharttoexplaintherelativelycompletesecondarystep-downsubstationdesign.Keywordselectricalpowersystem,electricalequipment,transformer,relayprotection目录摘要.........................................................................................................................IAbstract..................................................................................................................II第一篇设计说明书...............................................................................................-1-1变电所设计原则............................................................................................-1-1.1所址选择和所区规划..........................................................................-1-1.2电气部分设计原则..............................................................................-1-210KV线路导线的选择....................................................................................-3-2.1按经济电流密度选择导线经济截面积..............................................-3-2.2选择导线截面积的步骤......................................................................-3-3主变压器容量、台数和型式的选择............................................................-7-3.1变压器选择的规定..............................................................................-7-3.2主变压器容量和台数的选择..............................................................-7-3.3变压器型式的选择..............................................................................-8-4补偿电容器的选择......................................................................................-10-4.1求出变压器的功率损耗....................................................................-11-4.2补偿前平均功率因数计算公式........................................................-12-4.3补偿容量的计算................................................................................-12-4.4确定电容器台数.................................................................................-12-4.5补偿后总平均功率因数计算公式.....................................................-12-5电气主接线方案设计...................................................................................-13-5.1主接线设计的基本要求.....................................................................-13-5.2主接线方案.........................................................................................-14-5.3方案的比较与确定.............................................................................-15-5.4主接线二次方案的说明.....................................................................-15-6短路电流的计算..........................................................................................-16-6.1发生短路的原因和短路的定义........................................................-16-6.2短路的分类.........................................................................................-16-6.3计算短路电流的目的.........................................................................-16-6.4短路电流的计算过程.........................................................................-17-7电气设备的选择..........................................................................................-19-7.1断路器的选择.................................................................................