沈阳工业大学
4×50MW供热式火力发电厂电气设计
部分
The 4×50MW heating type thermal powerplantelectricity part design
学 院：电气工程学院
专业／班级 ：电气工程及其自动化022班 学 号：24 学 生 姓 名：杨 雪 滨 指 导 教 师：戴 宪 滨
2006 年6 月 14 日
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沈阳工业大学
中文摘要
电力系统专业的毕业设计是一次比较综合的训练，它是我们将在校期间所学的专业知识进行理论与实践的很好结合，运用理论知识和所学到的专业技能进行工程设计和科学研究，提高分析问题和解决问题的能力。在完成此设计过程中，我们可以学习电力工程设计、技术问题研究的程序和方法，获得搜集资料、查阅文献、调查研究、方案比较、设计制图等多方面训练，并进一步补充新知识和技能。本毕业设计论文是4*50MW供热式火力发电厂电气部分设计。为了保证供电的可靠性和一次性满足远期负荷的要求，按照远期负荷规划进行设计建设，从而保证发电厂能够长期可靠供电。
根据毕业设计任务书的要求，综合所学专业知识及《发电厂电气设计手册》等书籍的有关内容，设计过程中完成了主变选择、电气主接线的拟定、短路计算、电气设备选择、配电装置的规划、继电保护和自动装置的规划和防雷保护的规划等主要工作。在此期间，遇到的种种问题均通过反复比较、验算，并请教老师得以解决。毕业设计论文由设计说明书、设计计算书、一套图纸（电气主接线图、总平面布置图、配电装置断面图、防雷保护图）组成。内容较为详细，对今后扩建有一定的参考价值。
近年来，电力在世界各国能源和经济发展中的作用日益增长，它已成为现代社会实用最广、需要最快的能源。发电厂的合理设计与建设是一个极其重要的组成部分。本次设计是通过本人的精心设计论证完成的。整个设计过程中，全面细致的考虑工程设计的可靠性、经济性、灵活性等诸多因素，最终完成本设计方案。通过完成此毕业设计论文，进一步领会我国电力工业建设的政策观念和经济观点，培养对工程技术、经济进行较全面的综合分析能力。
由于时间紧张和能力有限，此论文中难免会出现遗漏和错误，希望老师给予指点和更正。
关键词：火力发电厂 电气设计 短路计算 设备选择 配电装置
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沈阳工业大学
Abstract
The professional graduate in system in electric power design is once more synthesize of training, it is we will during the period of school a profession for learning knowledge proceed theories and practice very good combination, make use of the theories knowledge proceeds with a profession for learning technical ability engineering design with science study, increase analyze problem with problem-solving ability.In complete this design process, we can study the electric power engineering the design, investigative procedure in problem in technique with method, be collected information, checked the cultural heritage, investigate the research, project comparison and design the various training in etc. in graphics, combine further complement the new information knows with technical ability.
This graduate design thesis is a 4*5MW heating type thermal power plant electricity part design.For the sake of dependable that guarantee the power supply with a request that contented long-term burthen, carries according to the forward the programming proceeding design developments, from but guarantee to change to give or get an electric shock can long-term dependable power supply.
Design the request of the mission book according to the graduate, synthesize a programming for learning profession knowledge and 《Thermal power plant electricity design handbook 》 designed waiting dog's- ear relevantly contents, designing in the process completing lord changing choice, electricity lord connecting linear draw- up, short circuit computing, electricity equipments choosing, going together with electricity equiping, after give or get an electric shock the protection with the programming of the automatic device with defend protective programming in thunder etc. main work.Here period, all kinds problems that meet all passes to compare, check to calculate again and again, and ask the can solution in teacher.Graduate to design the thesis from design the
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沈阳工业大学
manual, design calculation book, a set of diagrams paper( the electricity lord connects the line diagram, total flat surface arranges the diagram
and go together with electricity equip cross section diagram, defend thunder protection diagram) constitute.The contents is more detailed, to from now on extend to consults certainly value.
For this year, electric power is in international community energy with economy develop of the function increases increasingly, it have become modern the society is practical the most widely and need the quickest energy.Change the reasonable design that give or get an electric shock are a with developments very constituting the part importantly.
This design is at guiding teacher descend, passing oneself of design what argument complete with meticulous care.Whole design process inside, completely dependable, economic, vivid...etc. many factors that meticulous consideration engineering design, end complete this design project.
Pass to complete this graduate design the thesis, further appreciating the our country the policy idea of electric power industry developments with the economic standpoint, educates to proceed to the engineering technique, economy more completely to synthesize the analytical skill. Because time strain with ability limited, this thesis inside difficult do not need to will appear the lapse with mistake, hope the teacher give to point out with make correction.
Key word: Thermal power plant Electricity design short circuit
calculation The equipments choice electricity equips
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沈阳工业大学
目 录
中文摘要 .................................................................................................................................................... II ABSTRACT ..............................................................................................................................................III 目 录 ........................................................................................................................................................... V 引言 ............................................................................................................................................................. 1 第一部分 说明书 ..................................................................................................................................... 2 第一章 发电厂原始资料分析 ................................................................................................................... 2 第二章 主变压器的选择 ........................................................................................................................... 2 2.1发电厂主变压器的容量和台数的确定： ...................................................................................... 2 2.1.1 有发电机电压母线接线的主变压器 ..................................................................................... 2 2.1.2、单元接线的主变压器 ........................................................................................................... 3 2.2主变压器形式的选择 ....................................................................................................................... 3 2.2.1数的选择 .................................................................................................................................. 3 2.2.2绕组数量和方式的选择 .......................................................................................................... 3 2.3本厂主变压器的选择 ...................................................................................................................... 3 第三章发电厂电气主接线选择 ................................................................................................................. 5 3.1 概 述 .............................................................................................................................................. 5 3.2 主接线的设计原则 ......................................................................................................................... 5 3.2.1主接线的设计依据 .................................................................................................................. 5 3.2.2主接线设计的基本要求 .......................................................................................................... 6 3.3 本厂电气主接线的选择 ................................................................................................................. 7 3.3.1 主接线方案的预定 ................................................................................................................. 7 第四章 短路电流的计算 ....................................................................................................................... 9 4.1计算短路电流的目的： .................................................................................................................. 9 4.2电力系统短路电流计算 .................................................................................................................. 9 4.2.1 基本假定 ................................................................................................................................. 9 4.2.2 一般规定 ................................................................................................................................10 4.2.3 限流措施 ................................................................................................................................10 4.3短路计算点的选择 .........................................................................................................................10 4.4 短路计算方法 ................................................................................................................................ 11 4.5网络变换 ......................................................................................................................................... 11 4.6计算步骤 .........................................................................................................................................12 4.6.1 计算步骤： ............................................................................................................................12 第五章 电气设备的选择与校验 ..............................................................................................................12 5.1设计原则 .........................................................................................................................................12 5.1.1 一般原则 ................................................................................................................................12
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