摘要在电力系统中，变电所起着十分重要的作用。为达到地区供电负荷要求，实现安全可靠供电，需要根据5-10年电力系统发展的规划合理设计变电所。本次设计任务为庄河110KV降压变电所电气部分设计。文中阐述了变电所电气部分设计的基本原则、方法及结论。设计主要内容包括：根据10KV侧负荷进行负荷计算及无功补偿，选择54台BGF10.5-100-1W型电容器；根据系统容量选择2台变压器并联运行，型号为SFSZ7-15000/110三相双绕组变压器；经过方案比较，确定电气主接线方式高压侧为双母线接线方式，低压侧为单母线分段的接线方式；确定三个短路点并进行短路电流计算；进行断路器、隔离开关、电压互感器、电流互感器等设备的选择，并利用短路计算的结果对所选设备进行校验；配电装置的选择满足长期运行的要求；选择避雷装置，保证所设计变电所在安全范围内。为了详细说明，本设计绘制了电气主接线图。关键词：主变压器；电气主接线；短路计算AbstractInpeople'ssociallife,electricityplaysaveryimportantrole.Toachieveareapowersupplyloaddemand,safeandreliablepowersupply,It'sespeciallyimportanttodesignthesubstationaccordingtothe5-10yearselectricalsystemdevelopmentplanning.Thisdesignis110KVzhuanghesubstationsstep-downdesign.Inthisessay,wewilltalkaboutthebasicprincipleandmethodofdesign,thebasicangcalculatingmethodsandsteps.Designincluding:Accordingtotheconsumers10KVlateralloadcalculationandchooseBGF10.5-100-1Wtype54setsofreactivepowercompensationcapacitor;Accordingtothesamecapacity2choicesforparalleloperationmodelSFSZ7-15000/110three-phasemaintransformerwindingtransformerdouble;Bycontrastmethodtodeterminethemainelectricalwiring,singlegeneratrixofthebridgesectionoftheconnectionmode;Determingingthreeshort-circuitpointandshort-circuitcurrentcalculation;Choicingtherightcircuitbreaker,isolatingswitch,voltagetransformer,currenttransformerandotherequipment;Usingtheshortcircuitcalculationresultsofselectedequipmentcalibration;Distributiondeviceseletionmeetlong-termoperationinspection;Selectingtheavoidthunderdevicetoguaranteethesubstationinsafedesignrange.Inordertoelaboratethedesign,thisessayincludesthemainelectricalacircuitdiagram.Keywords：themaintransformer;electricalconnection;short-circuitcalculation目录第1章绪论........................................................................................................11.1变电所设计的目的和意义................................................................11.2设计背景及主要内容........................................................................1第2章负荷计算和无功补偿................................................................................22.1负荷计算............................................................................................22.2无功补偿............................................................................................2第3章主变压器的选择........................................................................................43.1概述....................................................................................................43.2变压器台数的选择............................................................................43.3主变压器的选择................................................................................5第4章电气主接线方案的确定............................................................................74.1概述....................................................................................................74.2主接线的接线方案.........................................
