220kV降压变电所电气设计

摘要

随着我国科学技术的发展，特别是计算机技术的进步，电力系统对变电所的更要求也越来越高。

本设计主要介绍了220kV变电站的主接线设计及变压器的选择，变电所电气主接线设计是依据变电所的最高电压等级和变电所的性质，选择出一种与变电所在系统中的地位和作用相适应的接线方式。在经济角度上要考虑周全，尽量以最少的投资获得最佳的方案。按照要求选择合适的变压器。短路电流计算，对变电站系统中的各个电压等级下的母线发生三相短路时，所流过的短路电流进行了分别计算。电气设备动、热稳定校验，电气设备的选择条件包括两大部分：一是电气设备所需要满足的基本条件，即按正常工作条件选择，并按短路状态校验动、热稳定；二是根据不同电气设备的特点而提出的选择和校验项目。电气总平面及配电装置断而设计，较为详细地完成了电力系统中变电所设计。

设计只对变电站电气一次部分做了较为详细的理论设计，而对其电气二次部分并没有涉及。

关键词：变电所；电路主接线；短路计算；稳定性

The electrical design of 220kV step down

substation Abstract

With the development of science and technology in China, particularly computing technology has advanced, the power system demands on substation more and more.

The article about the 220kV transformer area substation design, discussed some electrical transformer stations design (one part) in power systems engineering of the entire process. Through the main transformer stations wiring design, stations wiring design stations, short circuit current calcularions, check electrical equipment moving and thermal stability, set the main electrical equipment models and the parameters, the operating mode, design over-voltage protection and mine devices, design general electric and distribution devices flood, and without power compensarion. Lastly, substation design is completed in power system.

Limited to the specific design requirements and design time of constraints, the design only is a part of the electrical transformer stations, and its second part did not involve, which research it in future study and work.

Keywords：substation; main circuit wiring; short circuit calculation; stability

目录

摘要 ...................................................................................................................... I Abstract ............................................................................................................... II

第1章 绪论 ........................................................................................................ 1 1.1 课题背景 ................................................................................................... 1 1.2 论文研究的目的和意义 ........................................................................... 1 1.3 论文研究的内容 ....................................................................................... 2 第2章 电气主接线的设计 ................................................................................ 3 2.1 电气主接线的接线方法 ........................................................................... 3 2.1.1 单母线接线及单母线分段接线 ........................................................ 3 2.1.2 双母线接线及分段接线 .................................................................... 3 2.2 电气主接线的设计原则 ........................................................................... 4 2.3 电气主接线的方案选择 ........................................................................... 5 2.3.1 双母线接线方案 ................................................................................ 5 2.3.2 双母线带旁路母线接线方案 ............................................................ 5 第3章 主变压器的选择 .................................................................................... 7 3.1 主变压器的选择原则 ............................................................................... 7 3.1.1 主变压器台数的选择 ........................................................................ 7 3.1.2 主变压器容量的选择 ........................................................................ 7 3.1.3 主变压器型式的选择 ........................................................................ 9 3.1.4 绕组数量和连接形式的选择 ............................................................ 9 3.2 主变压器选择结果 ................................................................................... 9 第4章 220kV变电所短路计算 ...................................................................... 11 4.1 短路造成的后果及其计算目的 ............................................................. 11 4.1.1 短路的后果 ...................................................................................... 11 4.1.2 短路计算的目的 .............................................................................. 11 4.2 变压器的各绕组电抗标幺值计算 ......................................................... 12 4.3 10kV侧短路计算 .................................................................................... 13 4.4 220kV侧短路计算 .................................................................................. 14 4.5 110kV侧短路计算 .................................................................................. 14 第5章 电气设备和导体的选择 ...................................................................... 17 5.1 电气设备选择的一般原则 ..................................................................... 17 5.2 断路器和隔离开关的选择 ..................................................................... 17 5.2.1 220kV侧主变与出线的选择及校验 ............................................... 18