22027.5kV牵引变电所设计

220/27.5kV牵引变电所设计The Design of 220/27.5kV Traction

Substation

2013 届电气工程系

专业电气工程及其自动化

学号

学生姓名

指导老师

完成日期2013年5月27日

毕业设计成绩单

毕业设计任务书

毕业设计开题报告

摘要

牵引变电所是电气化铁路牵引供电系统的心脏，它的主要任务是将电力系统输送来的三相高压电转换成适合电力机车使用的电能。

设计一个220/27.5kV牵引变电所，首先要选择一个最优方案，画出主接线图，主接线是指牵引变电所内一次主设备的联接方式，也是变电所接受电能、变压和分配电能的通路。它反映了牵引变电所的基本结构和功能。然后进行变压器容量计算和短路计算分析。接着进行防雷和接地的设计。

本次设计实现由220kV降至27.5kV降压变压。主变压器采用三相牵引变压器YN,d11结线方式，额定容量为20MV A。一台投入使用，一台固定备用。变压器低压侧采用单母线分段接线形式，单母线分段采用隔离开关分段，便于故障检修，并能将故障和检修造成的影响局限在一定的范围内。高压侧和低压侧安装断路器和隔离开关,低压侧母线上安装无功补偿装置。无功补偿采用并联电容补偿。变电所内安装所内自用变压器，采用两台自用变压器，一台运行，一台固定备用。

关键词：主接线主变压器电气设备变电所短路计算

Abstract

The traction substation is the heart of the electric railway power supply system, its main task is to convert the three-phase high-voltage electric convey from the power systems to the electricity which is fit the electric locomotive.

To design a 220/27.5kV traction substation,the first of all to choose a the best scheme, draw the Lord the wiring diagram, the Lord wiring is to point the traction substations a main device the connection way, and is also substation accept electric energy, variable pressure and distribution of electric power pathways. It reflects the traction substation basic structure and functional. Then the transformer capacity calculation and short circuit calculation and analysis. And then the lightning protection and grounding design.

The design is substation achieve from 220kV down to 27.5kV step-down transformer. The main transformer uses the way of three-phase traction transformer YN,d11 connection way, the rated capacity is 20MV A. One of the two transformers put into use, another is stationary standby.Transformer low voltage side uses the form of single bus the terminal. Single Bus use isolation switch to segment in order to facilitate troubleshooting and failure and can control the impact of malfunction and repair within a certain range.High side and low side install circuit breakers and disconnectors. Reactive power compensation device installed on the low pressure side of the bus. The reactive power compensation use the parallel capacitor compensation. Substation installas own use transformers . One of the two own use transformer is operationand another is fixed alternate.

Key words:Main connection The main transformer Electrical equipment

Substation Short-circuit calculate

目录

第1章绪论 (1)

1.1世界电气化铁路的发展史 (1)

1.2我国电气化铁道简述 (1)

1.3电力牵引的优缺点 (1)

1.4本设计的主要内容 (2)

第2章牵引变电所电气主接线设计 (3)

2.1电气主接线的基本要求 (3)

2.2供电方案的选择 (3)

2.3 电气主接线方案的确定 (3)

2.3.1220kV侧桥型接线 (4)

2.3.227.5kV侧单母线分段接线 (5)

第3章牵引变压器选择 (6)

3.1牵引变压器概述 (6)

3.2牵引变压器备用方式和台数 (6)

3.3牵引变压器容量的选择 (6)

第4章短路电流计算 (10)

4.1短路电流概述 (10)

4.2短路原因及后果 (10)

4.3短路电流的计算 (10)

第5章电气设备的选择与校验 (16)

5.1概述 (16)

5.2电气设备选择的一般规则 (16)

5.3电气设备选择 (16)

5.3.1断路器的选择 (17)

5.3.2高压隔离开关的选型及校验 (18)

5.3.3电流互感器的选择 (19)

5.3.4电压互感器的选择 (20)

5.3.5避雷器的选择 (20)

5.3.6高压熔断器的选择和校验 (20)

5.3.7支柱绝缘子及穿墙套管的选择和校验 (21)

5.3.8 母线的选择与校验 (22)

5.3.9 自用变压器的选择 (24)

第6章防雷与接地措施 (25)

6.1防雷保护简述 (25)