110kv变电站电气一次部分初步设计.doc

110kV变电站电气一次部分初步设计

摘  要

随着电力技术高新化、复杂化的迅速发展，电力系统在从发电到供电的所有领域中，通过新技术的使用，都在不断的发生变化。变电所作为电力系统中一个关键的环节也同样在新技术领域得到了充分的发展。

根据设计任务书的要求，本次设计为110kV变电站电气一次部分初步设计，并绘制电气主接线图及其他图纸。首先，进行了电气主接线的选择，把电气主接线分为110kV、35kV和10kV三个电压等级，经过各个方案的优缺点比较，确定了各个电压等级分别采用单母线分段带旁母接线、单母线分段带旁母接线和单母线分段接线。其次，根据要求进行了主变压器的选择、短路电流计算、主要电气设备选择及校验，包括断路器、隔离开关、电流互感器、电压互感器、母线等。最后，对防雷保护和接地方案的设计进行了选择。

关键词：变电站；主变压器； 防雷保护  

ABSTRACT

Along with the economic development and the modern industry developments of quick rising, the design of the power supply system become more and more completely and system. Because the quickly increase electricity of factories, it also increases seriously to the dependable index of the economic condition, power supply in quantity. Therefore they need the higher and more perfect request to the power supply. Whether Design reasonable, not only affect directly the base investment and circulate the expenses with have the metal depletion in colour metal, but also will reflect the dependable in power supply and the safe in many facts. In a word, it is close with the economic performance and the safety of the people. Along with the high and quick development of electric power technique, electric power system then can change from the generate of the electricity to the supply the power.

From the guide of engineering design assignment, we have to design primary power-system of 110kV substation and draw main electrical one-line diagram and others. First, the main electrical connection can be divided into three voltage grades: 110kV, 35kV with 10kV.It deposits sectionalized single bus bar scheme, sectionalized single and sectionalized single bus bar scheme per grade. Second, there is a design for main electrical connection in this engineering, the calculation for short-circuit electric current,  the selection of electrical device and calibration including circuit breaker,  isolator, current，transformer, potential transformer ,bus bar etc. At last, the design for distribution installation per voltage grade and lightning protection is also included.  

Keywords：substation; the main transformer; lightning protection

目录

1引言 1

1.1设计的目的与意义 1

1.2负荷情况及分析 1

1.3设计的任务 2

2电气主接线及设计 3

2.1 电气主接线设计的基本要求 3

2.2 主接线接线方式概述 4

2.2.1 110kV电气主接线 6

2.2.2 35kV电气主接线 8

2.2.3 10kV电气主接线 9

3主变压器的选择 11

3.1 主变压器台数的确定 11

3.2主变压器容量的选择 11

3.3 绕组数量和连接形式的选择 12

3.4 主变型式的选择 13

3.5 冷却方式的选择 13

3.6主变型号的选择 13

4短路电流的计算 15

4.1计算短路电流的目的 15

4.2短路电流的计算步骤及结果 16

5电气设备的选择与校验 23

5.1 电气设备选择的一般条件 23

5.2 断路器的选择 25

5.2.1断路器种类选择 25

5.2.2断路器型号的选择和校验 26

5.3隔离开关的选择 28

5.4电流互感器的选择 31

5.5 电压互感器的选择 34

5.6母线的选择 35

6防雷与接地方案的设计 38

6.1 防雷设计 38

6.1.1防雷设计原则 38

6.1.2 避雷器的选择 38

6.1.3 避雷针的配置 41

6.2 接地设计 42

6.2.1 接地设计的原则 42

6.2.2 接地网型式选择及优劣分析 43

7结论与展望 44

致   谢 45

参考文献 46