摘要

本文首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了变电站的主接线，然后又通过负荷计算及供电范围确定了主变压器台数，容量及型号，同时也确定了站用变压器的容量及型号，最后，根据最大持续工作电流及短路计算的计算结果，对高压熔断器，隔离开关，母线，绝缘子，电压互感器，电流互感器进行了选型，从而完成了电气一次部分的设计。

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。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。该设计主要从理论上在电气主接线设计、短路电流计算、电气设备的选择、配电装置的布局、防雷设计、发电机、变压器和母线的继电保护等方面做详尽的论述，并与火力发电厂现行运行情况比较，同时，在保证设计可靠性的前提下，还要兼顾经济性和灵活性，通过计算论证火电厂实际设计的合理性与经济性。采用软件绘制了大量电气图和查阅相关书籍，进一步完善了设计。

关键词：变电站；短路电流计算；电气主接线；发电厂

Abstract

Firstly, this paper analyzes the load development trend according to the parameters of the system, circuit and all loads given in the task book. The establishment of the clarified the necessity from the aspects of load growth, and then through the proposed generalization of substation and line direction, and through the analysis of load data, safety, economy and reliability into consideration, determine the substation main wiring, then on the main transformer was determined by the load calculation and power supply scope sets, capacity and model number, At the same time, the capacity and type of transformer used in the station are also determined. Finally, according to the calculation results of the maximum continuous working current and short circuit, the selection of high voltage fuses, isolation switches, busbars, insulators, voltage transformers and current transformers is carried out, so as to complete the design of the electrical primary part.

Main electrical wiring is the primary part of electrical design of power plant and substation, and also constitutes an important link of power system. The determination of main wiring is closely related to the reliability, flexibility and economy of the whole power system and power plant and substation. The use of electric energy has penetrated into every field of society, economy and life, and the capacity of thermal power equipment accounts for 75% of the total installed capacity in China's power supply structure. This paper is a preliminary design of the primary part of a large thermal power plant with a 300MW turbogenerator, mainly completing the design of the main electrical wiring. This design is mainly from the theory in the main electrical wiring design, short-circuit current calculation, the selection of electrical equipment, power distribution equipment layout, design of lightning protection, generator, transformer and bus do detailed discussion of relay protection, etc, and compared with the current operation of the coal-fired power plants, at the same time, under the premise that guarantees the reliability of the design, but also both economy and flexibility, The rationality and economy of actual design of thermal power plant are proved through calculation. Using software to draw a large number of electrical diagrams and refer to relevant books, further improve the design.

Key words: Substation; Short-circuit current calculation; Main electrical wiring; Power plants

完整论文点击如下链接下载：

https://download.csdn.net/download/weixin_45905610/88536898

火电厂电气部分详细设计资源-CSDN文库

CAD图纸点击如下链接下载：

https://download.csdn.net/download/weixin_45905610/88536900

火电厂电气部分设计-图纸资源-CSDN文库