大型火力发电厂电气部分设计_毕业论文

毕业论文（设计）任务书

院（系）电气工程系________ 专业班级XXX 班___________ 学生姓名XXX ____________

一、毕业论文（设计）题目火力发电厂电气部分设计__________________________________________

二、毕业论文（设计）工作自XXX 年3月_J_日起至XXX 年_6_月_ 日止

三、毕业论文（设计）进行地点：______________________________________________________________

四、毕业论文（设计）的内容要求：

（一）设计原始资料

1 •发电厂建设规模

某地区根据电力系统的发展规划，拟新建一座装机容量为700MW 的凝汽式火力发电厂，装机 4 台，2台50MW 机组（U N =10.5kV ）,2 台300MW 机组（U N =15.75kV ），厂用电率6%，机组年利用小时T max=6500ho_____________________________________________________________ 2 •电力负荷及与电力系统连接情况

1）10.5kV电压级：最大负荷20MW，最小负荷15MW , COS = 0.8,电缆馈线10回; _____________ 2）220kV电压级：最大负荷250MW，最小负荷200MW , COS = 0.85, T max=4500h，架空线6

（三）设计要求

1、设计要遵循国家现行法律、法规，贯彻执行国家经济建设的方针、政策和基本建设程序:

2、在满足可靠性的前提下，尽量经济，便于施工、维护、检修、扩建等；

3、积极采用成熟的新产品和新技术，主要设备要做到可靠、适用、先进；

4、变电站应靠近负荷中心，节约用地；具有线路进出线走廊，交通运输方便；

5、电气设备选择结果应以表格的形式给出；

6、图纸要求用AutoCAD绘制，图纸的图幅、图框、文字、符号应符合国家标准的规定。（四）设计成果

1、设计说明书一份

2、发电厂电气主接线图一张

火力发电厂电气部分设计

［摘要］由发电、变电、输电、配电和用电等环节组成的电能生产与消费系统。它的功能是将自然界的一次能源通过发电动力装置转化成电能，再经输、变电系统及配电系统将电能供应到各负荷中心。

电气主接线是发电厂、变电所电气设计的首要部分，也是构成电力系统的重要环节。主接线的确定对电力系统整体及发电厂、变电所本身的运行的可靠性、灵活性和经济性密切相关。并且对电气设备选择、配电装置配置、继电保护和控制方式的拟定有较大的影响。电能的使用已经渗透到社会、经济、生活的各个领域，而在我国电源结构中火电设备容量占总装机容量的75%本文是对配有2台50MV和2台300MW汽轮发电机的大型火电厂一次部分的初步设计，主要完成了电气主接线的设计。包括电气主接线的形式的比较、选择；主变压器、启动/备用变压器和高压厂用变压器容量计算、台数和型号的选择；短路电流计算和高压电气设备的选择与校验；并作了变压器保护配置

［关键词］发电厂；变压器；电力系统；继电保护；电气设备

The Desig n Of Steam power pla nt electrical part

Abstract：By the power generation, transformation, transmission and distribution of electricity and en ergy comp onen ts, and other aspects of product ion and con sumptio n systems. It is the function of the natural world through the power of primary energy into electrical energy power plant, then lost, transforming the system and distribution system will supply power to the load cen ters.

Electrical wiri ng is the main power pla nt, electric substati on desig ned first and foremost part of the power system is also con stitute an importa nt part. Determ in ati on of the mai n cable on the power system as a whole and power plants, substations to run its reliability, flexibility and economy are closely related. And choice of electrical equipment, power distribution equipment configuration, relay protection and control of the means to develop a greater impact. The use of power has in filtrated the social, econo mic, in all areas of life, and in the power structure of Chi na's thermal power equipme nt capacity of the total in stalled capacity of 75%. This article is equipped with 2*50 and 2*300MW turbo-ge nerator of large-scale thermal power plants a part of the preliminary design of the main completed the main electrical wiring design. Including the electrical wiring of the main forms of comparison, the choice; main tran sformer, the start / sta nd-by tran sformer and the high-voltage tran sformer factory with the capacity of calculation, the number of models and options; short-circuit current calculation and high-voltage electrical equipment selection and validation; and made the protection of tran sformer .

Key words: power plant; transformer; power system; relay; electrical equipment.