2X300MW火力发电厂厂电气一次设计

内蒙古科技大学

本科生毕业设计

题 目：2×600MW火力发电厂

厂用电设计

学生姓名：***

学 号：0705130113

专 业：电气工程及其自动化

班 级：电气07-1班

指导教师：***(教授)

摘 要

本文将针对某火力发电厂的设计，主要是对电气方面进行研究。本次设计的电厂在电网占有重要位置，一旦发生事故将引起主网的解裂，所以对电厂主接线形式进行了详细的分析比较，以确定一种安全经济成熟的主接线形式。

首先对火力发电的有关内容做以阐述，并对电力主接线中的设备做以描述。依据所给出的原始数据和接线的基本原则进行了主接线形式的设计,选择了低压侧用双母线三分段，而高压侧用双母线的接线形式。简单的介绍了厂用电，对主变压器进行了选择。在三相短路实用计算基本假设的前提下，对三相短路电流进行了计算。根据负荷计算和短路电流计算的结果对断路器等电气设备进行了选择和校验。根据基本原则结合具体要求，绘制完成电气主接线图的一次部分。

本毕业设计只对电气主接线一次部分做了较为详细的理论设计。通过对本次的设计设计，掌握了一些基本的设计方法，在设计过程中更加稳固了理论知识。

关键词：火力发电 电气主接线 主要设备

Electrical Design for the primary said of the coal-fired

power plant-2*300MW

Abstract

design of the power plant to power grid play an important role, once accident will cause the solution of the crack. So to wiring form of the power plant carrys on the detailed analysis comparison, to determine a safe and economic mature Lord connection form.

First of all the relevant contents of the power to do this,and to the electric wiring the equipment to do argued that description. According to the original data and the basic principles of the wiring design the wring.Choose the low voltage side with a bus, and three segmentation high pressure side with a bus of wiring form. Simple introduced the station service, and choose the main transformer. on the premise of the three-phase short-circuit basic assumptions carry out the three-phase short-circuit current calculation. According to the results of load calculation and short-circuit current calculation,circuit breaker electrical equipment were chosen and calibration.According to the basic principle with specific requirements,paint the main electrical wiring .

The graduation design only for a part of the main electrical wiring goes on detailed design of theory. Through this design, have some basic design methods, in the design process and solid theoretical knowledge.

Key words: Thermal power electrical main wire lightning protection

目录

摘 要 ....................................................................................................................................... I Abstract ...................................................................................................................................... II 目录 .......................................................................................................................................... III

前言 ............................................................................................................................................ 1

第一章 原始资料 ...................................................................................................................... 2

第二章 电气主接线的设计 ...................................................................................................... 3

2.1 电气主接线的设计 ...................................................................................................... 3

2.1.1 电气主接线的设计原则 .................................................................................... 3

2.2 电气主接线的叙述 ...................................................................................................... 3

2.2.1 两种方案的比较 ................................................................................................ 6

2.3 主接线的确定 .............................................................................................................. 7

第三章 厂用电的设计 .............................................................................................................. 8

3.1 厂用电负荷的分类 ...................................................................................................... 8

3.2 厂用电的设计 .............................................................................................................. 9

第四章 短路电流的计算 ........................................................................................................ 10

4.1 短路的基本概念 ........................................................................................................ 10

4.1.1 故障类型及原因 .............................................................................................. 10

4.1.2 短路的危害及措施 .......................................................................................... 11

4.1.3 短路电流计算的目的 ...................................................................................... 12

4.1.4 短路电流计算的基本假设 .............................................................................. 12

4.2 短路电流的计算 ........................................................................................................ 13

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