1、 I 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
2、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。 关键词关键词：主变压器；电气主接线；短路计算 II Abstract In peoples social life,electricity plays a very important role.To achieve area power supply load demand,safe and reliable power supply,Its especial
3、ly important to design the substation according to the 5-10 years electrical system development planning.This design is 110KV zhuanghe substations step-down design. In this essay,we will talk about the basic principle and method of design , the basic ang calculating methods and steps.Design includin
4、g:According to the consumers 10KV lateral load calculation and choose BGF10.5-100-1W type 54 sets of reactive power compensation capacitor;According to the same capacity 2 choices for parallel operation model SFSZ7-15000/110 three-phase main transformer winding transformer double;By contrast method to determine the main electrical wiring,single generatrix of the bridge section of the connection mode;Determinging three short-circuit point and short-circuit current calculation;Choicing the righ
