35KV降压变电所一次系统电气设计

本 科 生 毕 业 设 计 (论 文)

题目：35KV降压变电所一次系统电气设计

教学单位 ____电气信息工程学院_ 姓 名 ____ 李铭____________ 学 号 _____200831002067____ 年 级 _____2008级_________ 专 业 ___电气工程及其自动化 指导教师 ___ 王玉 职 称 ___ 讲师

2011年 12月 3日

摘要

为了把35KV的电压变成10KV给用户使用，本设计设计了35KV降压变电所。设计以负荷为依据，以变电所的最佳运行为基础，按照有关规定和规范，完成了满足供电要求的35KV变电所的一次侧电气设计。设计中先对负荷进行了统计和计算，选出了所需要主变压器型号，然后根据负荷性质及对供电可靠性要求拟定主接线设计，考虑到短路对系统的严重影响，设计中进行了短路计算。设计中还对主要高压电气设备进行了选择，如断路器，隔离开关，电压互感器，电流互感器等。此外还进行了防雷设计和继电保护设计，提高了整个变电所的安全性。

关键词：35KV 变电所 负荷 防雷 总体设计

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Abstract

In order to put the 35 KV voltage into 10KV to user . This design ,designed the 35KVStep-down substation .The design based on actual load ,the best operation based in substations , in accordance with the relevant provisions and norms .and completed to meet the requirements of the 35KV electricity substations preliminary design .Design of the first load of statistics and calculations ,elected for the change Models ,and then load according to the nature and reliability of electricity for the development of the wiring design ,taking into account the short-circuit serious

impact on the system design of a short-circuit basis . Design of the main high voltage electrical equipment on the choices and calculations ,such as circuit breakers ,isolation switches . In addition ,the design and calculation of mine-protected and the security of the entire substations .

Key words:35KV Substation load mine-protected Overall design

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目录

第一章 绪论 ............................................................................................................................. 6 1.1 课题资料 ........................................................................................................................... 6 1.2 主要工作 ........................................................................................................................... 7 第二章 电力负荷计算 ............................................................................................................. 8 2.1 各负载电力负荷计算 ....................................................................................................... 8 2.2 变电所电力负荷计算 ..................................................................................................... 10 2.3全变电所总计算负荷 ...................................................................................................... 12 第三章 变电所址选择及无功补偿装置确定 ....................................................................... 14 3.1 所址的选择 ..................................................................................................................... 14 3.2 无功补偿装置的确定 ..................................................................................................... 14 第四章主变压器电气主接线方案的选择 ............................................................................. 16 4.1主变压器的选择 .............................................................................................................. 16 4.2电气主接线方案确定 ...................................................................................................... 16 第五章 短路电流的计算 ....................................................................................................... 22 5.1短路的原因及其危害 ...................................................................................................... 22 5.2高低压架空线的选择 ...................................................................................................... 23 5.3 35KV短路电流的计算 .................................................................................................. 24 5.4 10KV短路电流的计算 .................................................................................................... 25 第六章 变电所高低压电气设备的选择 ............................................................................... 27 6.2高低压母线的选择 .......................................................................................................... 27 6.3高低压断路器的选择 ...................................................................................................... 28 6.4高低压隔离开关的选择 .................................................................................................. 30 6.5高低压互感器的选择 ...................................................................................................... 31 第七章 继电保护的配置和防雷接地 ................................................................................... 34 7.1继电保护的配置 .............................................................................................................. 34 7.2防雷和接地装置 .............................................................................................................. 35 毕业设计总结 ......................................................................................................................... 36 本文总结 ................................................................................................................................. 36 有待完善的问题 ..................................................................................................................... 36

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