[工学]110kV降压变电所电气部分毕业设计.doc

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 Abstract In peoples social life,electricity plays a very important role.To achieve area power supply load demand,safe and reliable power supply,Its especially 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 including: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 right circuit breaker,isolating switch ,voltage transformer,current transformer andother equipment;Using the short circuit calculation results of selected equipment calibration;Distribution device seletion meet long-term operation inspection;Selecting the avoid thunder device to guarantee the substation in safe design range.In order to elaborate the design,this essay includes the main electrical acircuit diagram. Key words：the main transformer;electrical connection;short-circuit calculation 第1章 绪 论 1 1.1 变电所设计的目的和意义 1 1.2 设计背景及主要内容 1 第2章 负荷计算和无功补偿 2 2.1 负荷计算 2 2.2 无功补偿 2 第3章 主变压器的选择 4 3.1 概述 4 3.2 变压器台数的选择 4 3.3 主变压器的选择 5 第4章