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摘要本次设计为110KV变电站的初步设计书。首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了110kV，35kV，10kV以及站用电的主接线.对电气设备的选型作了详细的说明和计算，短路电流的计算有严格的计算书。又通过负荷计算及供电范围确定了主变压器台数，容量及型号。最后，根据最大持续工作电流及短路计算的计算结果，做出线路保护，变压器保护，母线保护，防雷保护，从而完成了整个变电站设计。关键词:变电站；负荷计算；主接线；电气设备选型；继电保护ABSTRACTThedesignof110KVsubstationsisforpreliminarydesign.First,accordingtothetaskgivensystemandlinebookandalltheparameters,maketheanalysisofloaddevelopmenttrend.Fromtheloadincreasingillustratesthenecessityoftheestablishmentofconstruction,andthenthroughthegeneralizationofsubstationandoutlettoconsider,andthroughtheanalysisofthedataofload,safety,economyandreliabilityintoconsideration,determinethe110KVandconsumers10kVpowerstation,aswellas35kVmainconnection.Analysestheargumentationof110KVsubstationsauto-switchmannerofvariousadvantagesofelectricalequipmentselectionandcalculation,thedetaileddescriptionofshort-circuitcurrentcalculationhavestrictcalculations.Andthroughtheloadcalculationandscopeofsupplydetermined,themaintransformercapacityandmodels.Finally,accordingtothemaximumcontinuousworkingcurrentandshortcircuitcalculationresultsofcalculation,makelineprotection,transformerprotection,busbarprotection,lightningprotection,substationtofinishthewholedesign.Keywords:Transformersubstation；Considerationofload；MainConnection；thechoiceofElectricalEquipment；Relay目录1概述1.1课题来源.............................................................11.2设计依据.............................................................11.3设计范围.............................................................11.4设计分工.............................................................11.5设计的基本要求.......................................................21．6基础资料............................................................21.6.1原始背景资料.......................................................21.6.2变电站负荷情况分析.................................................42电气主接线方案的确定......................................................52.1选择原则.............................................................52.1.1主接线设计的基本要求..............................................62.1.2主接线的设计依据...................................................82.2主接线的方案与分析...................................................82.2.1110KV侧主接线设计.................................................92.2.235KV侧主接线设计.................................................112.2.310KV侧主接线设计.................................................122.2.4所用电设计........................................................133主变压器台数和容量的选择.................................................143.1变压器的选择原则....................................................143.2主变压器型式的选择..................................................143.3主变中性点接地设计..................................................153.3.1110kV侧中性点接地方式...........................................153.3.235kV、10kV侧中性点接地方式......................................153.4主变全绝缘、半绝缘、绕组材料等问题的解决............................163.5变压器台数的选择....................................................163.6变电站负荷计算......................................................173.7变压器容量的选择....................................................183.7.1主变容量选择及校验................................................183.7.2所用变选择........................................................194短路电流的计算...........................................................214.1短路概述............................................................214.2短路电流计算的目的..................................................224.3短路电流计算的条件..................................................224.3.1基本假定..........................................................224.3.2一般规定..........................................................234.4短路电流的标么值算法................................................234.5短路电流计算结果....................................................245变电所电气设备选择.......................................................295.1概述................................................................295.2选择设备的基本原则..................................................305.3断路器的选择........................................................315.3.1选择断路器时应满足以下基本要求....................................315.3.2断路器的主要参数..................................................315.3.3断路器选择其他考虑因素............................................315.3.4110kV断路器的选择：.............................................325.3.535kV断路器的选择：...............................................335.3.610kV断路器的选择.................................................345.4隔离开关的选择......................................................345.4.1隔离开关的作用....................................................355.4.2形式结构..........................................................355.4.3选择条件..........................................................355.4.4选择隔离开关基本要求..............................................355.4.5110kV隔离开关的选择..............................................365.4.635KV隔离开关的选择...............................................365.4.710kV隔离开关的选择...............................................375.5母线的选择....................