摘要:电能是当今社会的主要能源，随着经济社会的不断发展，我国对电力的需求量也在逐年增加，迄今为止，我国电力工业已经进入了大机组、大电厂、大电力系统、高电压和高自动化的新阶段。这就对电力系统的安全、稳定运行提出了更高的要求，特别是国家正大力发展电力，加大了对大机组、大电厂的投资力度，因此电厂的设计就显的尤为重要，基于此背景，故将火力发电厂的设计作为本次毕业设计的题目。

　　　本次毕业设计主要是针对2×100MW火电厂进行电气一次部分的设计。设计的主要内容包括：电气一次主接线和厂用电系统的构成与设计、短路电流计算、导体与电气设备的设计与选择。通过已知的原始资料，在结合相关的工程实践，本次设计较好的完成了2×100MW火电厂电气一次部分的设计，电气主接线，导体，电气设备的设计，都是经过理论的验证和严格的计算，最后设计出了满足火电厂安全运行的电气一次部分，所有设计的内容均在计算机上完成，所设计出的火电厂电气主接线图纸在AUTOCAD上绘制完成。

关键词：一次主接线 ；短路电流计算；导体 ；电气设备

Abstract: The electricity is the main energy in today's society, with the development of social economy, China's demand for power in increase year by year, so far, our country electric power industry has entered the big unit, big power plant, big power system, high voltage and high automation of the new stage. This is in power system security and stable operation of a higher demand, especially the country is developing power, increase the power of large unit, the investment, so the design of the power plant on the significant particularly important, based on this background, the design of coal-fired power plants as the graduation design topic. 

　　　The graduation design is mainly aimed at 2 x 100 MW coal-fired power plant electrical a part of the design. The design of the main content includes: electrical a Lord wiring and factory electricity the structure of the system and design;Short-circuit, current calculation; Conductor and electrical equipment in the design and selection. Through the known original material, in combination with the engineering practice of related, the design good has completed 2 x 100 MW coal-fired power plant electrical a part of the design, the main electrical wiring, the conductor, electrical equipment design, it is through the verification, and strict theoretical calculation, and finally designed to meet the safe operation of the electric power is a part, all of the content is designed on the computer to complete, the design of the main electrical wiring drawings in thermal power plants on the painted AUTOCAD.

Keywords: A lord connects the line Go together;the electricity device; Electricity        Conductor;  Electricity equipments.