摘要本次设计内容是某地区一座火力发电厂的电气一次部分设计，以及该地的地区电网架构设计。

在地区电网架构设计时，根据该地发电厂装机容量及变电所负荷进行了简单的地区电网架构设想。通过一个110kV和220kV的典型电网结构进行造价估算和年线损估算，在经济比较后确定地区电网的电压等级。而后根据所选电压等级设计了四个地区电网架构方案，在几个方案的造价估算之后确定了最终的地区电网架构，并进行了最大运行方式下的潮流计算。

在火电厂电气部分进行设计时，确定了发电机选型后，根据负荷情况对电气主接线设计了两种方案，并优选了其中一种，根据该方案进行了主变压器的选型。对该方案进行了三相短路计算，根据结果为火电厂的断路器、隔离开关、电压互感器、电流互感器、避雷器、熔断器、母线材质选型，并进行稳定性校验。最后为部分电气设备进行了继电保护配置。设计中使用AutoCAD绘制了火电厂电气主接线一次设备图。84710

毕业论文火力发电厂  地区电网  电气主接线  电气设备  继电保护

毕业设计说明书外文摘要

Title    Electrical part design of thermal power plant   and regional power grid                       

Abstract The design content is a region of a thermal power plant primary electrical part design, as well as the regional power grid architecture design。 

In the regional power grid architecture design, according to the power plant installed capacity and substation load carried out a simple regional power grid architecture。 Through the typical grid structure of a 110kV and 220kV of cost estimation and annual loss estimate, after an economic comparison is made to determine regional power grid voltage level。 Then according to the selected voltage level design of the four regional power grid architecture plan, the cost estimation of several programs to determine the final regional power grid architecture, and carried out the power flow calculation under the maximum operating mode。

In the electrical part of the thermal power plant design, first determine the type selection of generator, according to the load condition design two main electrical connection schemes, and optimized one, then select main transformer according to the scheme。 The three-phase short-circuit calculation is carried out。 According to the results, the circuit breaker, arrester, fuse, isolating switch, voltage transformer, current transformer and bus material selection of thermal power plant are selected, and the stability check is carried out。 In the end, the relay protection configuration for some electrical equipment is carried out。 Design in the use of AutoCAD to draw the power plant main electrical connection and device diagram。

Thermal power plant  Regional power grid  Main Electrical Connection

Electrical equipment  Relay protection

目   录

1  设计任务 1

1。1  原始资料1

1。2  设计内容2

2  设计报告书 3

2。1  资料解读3

2。2  火电厂、水电厂的发电机型号及参数3

2。3  地区接线方案3

2。4  火电厂电气主接线4

2。5  火电厂主变压器型号及参数5

2。6  短路电流水平5

2。7  电气设备选型与校验6

2。8  继电保护配置9

3  设计分析及计算部分13

3。1  变电站功率因数补偿13

3。2  地区用电增幅估算13

3。3  地区电网架构思想14

3。4  该地地区电网电压等级选择15