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东北电力大学 成人高等教育毕业设计 题 目： 35kV箱式变电站设计 学生姓名：张立佳 专 业：电气工程及其自动化 完成时间 ：2012年4月20日摘 要摘 要箱式变电站又称户外成套变电站，即将高压受电、变压器降压、低压配电等功能有机地组合在一起，安装在一个防潮、防锈、防尘、防鼠、防火、防盗、隔热、全封闭、可移动的钢结构箱体内，机电一体化，全封闭运行，特别适用于矿山、住宅小区等城市公用设施，用户可根据不同的使用条件、负荷等级选择箱式变电站。箱式变电站发展于20世纪60年代至70年代欧美等西方发达国家推出的一种户外成套变电所的新型变电设备，进入20世纪90年代中期，国内开始出现简易箱式变电站，并得到了迅速发展。随着中国城市现代化建设的飞速发展，城市配电网的不断更新改造，必将得到广泛的应用。本课题的主要内容包括箱式变电站的发展应用，箱式变电站的结构分类，以及箱式变电站一次系统设计极其设备选型以及二次系统设计。35kV箱式变电站的设计高压侧额定电压为35kV，低压侧额定电压为10kV，主变压器容量为5000kVA。主接线采用单母线分段接线。 关键词：箱式变电站；结构，一次系统，二次系统 I目 录目 录摘 要 ····································································································· 目 录 ···································································································· 第一章 引言 ························································································ 1第二章 箱式变电站的类型、结构与技术特点 ······································· 22.1 箱式变电站的类型 ········································································ 22.2 箱式变电站的技术特点 ································································· 22.3 箱式变电站的箱体要求 ································································ 3第三章 35kV箱式变电站的总体结构设计 ············································· 53.1 箱式变电站对主接线的基本要求 ··················································· 53.2 主接线的选择 ················································································ 53.3 高压接线方式 ················································································ 63.4 箱式变电站箱体的确定 ································································· 63.5 变压器的散热处理 ········································································ 63.6 箱式变电站总体布置 ····································································· 7第四章 35KV箱式变电站一次系统设计与设备选型 ······························· 84.1 一次系统设计 ················································································ 84.2 箱式变电站设备选型应注意的方面 ················································ 84.3 设备选型的基本原理 ····································································· 84.4 高压一次设备的选型 ····································································· 84.5 低压一次设备选型 ········································································ 94.6 高压熔断器的选择 ········································································ 134.7 开关柜的选型 ················································································ 13第五章 35kV箱式变电站二次系统设计 ················································· 135.1 二次系统的定义及分类 ································································· 145.2 电气测量仪表及测量回路 ······························································ 145.3 二次系统设计 ················································································ 155.4 断路器控制与信号回路 ································································· 155.5 控制回路设计 ················································································ 23 结论 ······································································································· 27 参考文献 ······························································································· 28 致谢 ······································································································· 29II第一章 引 言第一章 引 言随着矿山机电的发展，要求高压直接进入负荷中心，形成高压受电-变压器降压-低压配电的供电格局，所以供配电要向节地、节电、紧凑型、小型化的方向发展，箱式变电站(简称箱变)正是具有这些特点的最佳产品，因而在矿山电网中得到广泛应用。箱式变电站外壳采用钢板或者合金板，配有双层顶盖，隔热性好。外壳及骨架全部经过防腐处理，具有长期户外使有的条件。外形及色彩可与环境相互协调一致。安装方便。箱变高压侧采用负荷开关加限流熔断器保护。发生一相熔断器熔断时，用熔断器的撞针使负荷开关三相同时分闸，避免缺相运行。低压侧采用负荷开关加限流熔断器保护，自动空气开关欠电压保护或过电流保护就会动作，低压运行不会发生。- 1 -第二章 箱式变电站的