大学本科学生毕业设计（论文） 中文摘要
摘 要
发电厂是电力系统的一个重要组成部分，它的主要作用是生产和分配电能，其电气接线包括一次接线和二次接线两大部分。本次设计的是（4×100MW）凝汽式发电厂电气一次部分设计。设计的主要内容有：
① 发电厂电气一次部分的接线设计。
1）主接线形式的确定，主要有主变压器的选择、负荷出线导体的选择和各电压等级接线形式的确定；
2）确定发电厂厂用电接线系统，包括厂用工作变压器和备用变压器的选择； ② 计算各母线和发电机端口的三相短路电流，列出短路电流计算结果表。 ③ 电气设备选择和配电装置设计。
1）按正常工作电流选择断路器、隔离开关、互感器等电气设备，并确定高压开关柜的型号；
2）按三相短路电流校验电气设备； 3）列出电气设备选择结果表。
④ 绘制发电厂电气一次接线图和典型间隔断面图。
关键词：发电厂，变电站，电气接线，电气设备
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大学本科学生毕业设计（论文） ABSTRACT
ABSTRACT
The power plants are important components for the power system, and their main role is to produce and distribute electrical energy. Their electrical connection includes two parts that are main connection and secondary connection. In the paper, the electrical primary part of condensing power plants（4×100MW）is designed. The main contents of the design are as follows:
① The design of the main electrical connection for the power plants.
1) Determination of the main electrical connection form, including the selection of the main transformers and the conductors of outgoing loads ,and the determination of the electrical connection form for each voltage level;
2) Determination of the electrical connection system in their own power plant, including the selection of the working transformer and standby transformer.
② The three-phase short circuit currents on each bus and generator outlet need to be calculated, listing the results of the short-circuit currents in a table.
③ The choice of electrical equipment and the design of distribution equipment. 1) Select the electric equipment including circuit breakers、disconnectors、instrument transformers and so on according to the normal operating currents, then determine the type of high voltage switchgear;
2) Check the electrical equipment according to the three-phase short circuit currents;
3) List the results of electrical equipment in table. ④Draw the main electrical connection diagram for power plant and the cross section diagram.
Key words：power plant, substation, electrical connection, electrical equipment
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大学本科学生毕业设计（论文） 目录
目 录
中文摘要 ..................................................................................................................................... I ABSTRACT ............................................................................................................................. II 1 主接线与厂用电接线形式的确定 ........................................................................... 1
1.1 发电厂的电压等级与主接线的基本结构 .......................................................................... 1 1.2 主变压器型式的确定 .......................................................................................................... 1 1.3 接入高、中压母线的发电机台数的确定 .......................................................................... 2 1.4 负荷出线的规划 .................................................................................................................. 3 1.4.1 传输能力要求的负荷出线回路数 ............................................................................. 3 1.4.2 供电可靠性要求的负荷出线回路数 ......................................................................... 5 1.5 主接线中的横向联络关系 .................................................................................................. 5 1.6 厂用电接线形式的确定 ...................................................................................................... 5 1.6.1 厂用电接线的要求 ..................................................................................................... 5 1.6.2 厂用变压器的确定 ..................................................................................................... 6 1.6.3 厂用电母线的分段 ..................................................................................................... 6
2 短路电流的计算 ................................................................................................................ 8
2.1 短路电流计算的目的 .......................................................................................................... 8 2.2 计算步骤 .............................................................................................................................. 8 2.3 绘制短路电流计算结果表 ................................................................................................ 10
3 配电设备的选择 .............................................................................................................. 12
3.1 配电设备的配置原则 ........................................................................................................ 12 3.1.1 开关电器的配置原则 ............................................................................................... 12 3.1.2 电压互感器的配置原则 ........................................................................................... 12 3.1.3 电流互感器的配置原则 ........................................................................................... 12 3.2 配电装置的选择 ................................................................................................................ 12 3.3 配电设备的选择计算条件 ................................................................................................ 13 3.3.1 通用计算条件 ........................................................................................................... 13 3.3.2 特殊选择条件 ........................................................................................................... 14 3.3.3 开关柜的选择 ........................................................................................................... 15 3.4 配电设备的选择结果 ........................................................................................................ 15
4 主接线设计计算 .............................................................................................................. 17
4.1 各负荷站出线导体的选择和校验 .................................................................................... 17
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大学本科学生毕业设计（论文） 目录
4.1.1 负荷1站 ................................................................................................................... 17 4.1.2 负荷2站 ................................................................................................................... 17 4.1.3 负荷3站 ................................................................................................................... 18 4.1.4 负荷4站 ................................................................................................................... 19 4.2发电机-变压器单元接线的计算 ....................................................................................... 19 4.2.1主变压器的选择 ........................................................................................................ 19 4.2.2 发电机组的分配 ....................................................................................................... 19 4.3 厂用变压器的选择计算 .................................................................................................... 20 4.3.1 厂用工作变压器的选择计算 ................................................................................... 20 4.3.2 厂用备用变压器的选择计算 ................................................................................... 20
5 短路电流计算 ................................................................................................................... 21
5.1 求取等值网络 .................................................................................................................... 21 5.1.1 计算元件电抗 ........................................................................................................... 21 5.1.2 短路输入的数据文件 ............................................................................................... 22 5.2 220KV母线三相短路计算 ................................................................................................. 23 5.3 110KV母线三相短路计算 ................................................................................................. 26 5.4 接联络变压器的发电机出口三相短路计算 .................................................................... 29 5.5 接双绕组变压器的发电机三相短路计算 ........................................................................ 31 5.6 6KV母线三相短路计算 ..................................................................................................... 34
6 配电设备的选择计算 ................................................................................................... 35
6.1 220KV电压等级配电设备的选择计算 ............................................................................. 35 6.1.1 联络变高压侧支路 ................................................................................................... 35 6.1.2 220kV母联支路 ........................................................................................................ 36 6.1.3 220kV出线支路 ........................................................................................................ 37 6.1.4 220kV旁路支路 ........................................................................................................ 38 6.2 110KV电压等级配电设备的选择计算 ............................................................................. 39 6.2.1 联络变中压侧支路 ................................................................................................... 39 6.2.2 110kV母联支路 ........................................................................................................ 40 6.2.3 110kV出线支路 ........................................................................................................ 41 6.2.4 110kV旁路支路 ........................................................................................................ 43 6.2.5 双绕组变压器高压侧支路 ....................................................................................... 43 6.2.6 厂用备用变压器高压侧支路 ................................................................................... 44 6.3 10KV电压等级配电设备的选择计算 .............................................................................. 45 6.3.1 联络变侧厂用变压器高压侧支路 ........................................................................... 45
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大学本科学生毕业设计（论文） 目录
6.3.2 联络变侧发电机出口支路 ....................................................................................... 47 6.3.3 双绕组变压器侧厂用变压器高压侧支路 ............................................................... 48 6.3.4 双绕组变压器侧发电机出口支路 ........................................................................... 49 6.4 6KV配电设备的选择计算 ................................................................................................. 50 6.4.1 6kV开关柜的选择计算 ............................................................................................ 50 6.4.2 6kV母线的选择计算 ................................................................................................ 51
参考文献 ................................................................................................................................... 52
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