2×300MW火力发电厂电气部分设计.doc

2×300MW火力发电厂电气部分设计PAGE PAGE 9 摘要由 HYPERLINK /view/66230.htm \t _blank 发电、 HYPERLINK /view/38014.htm \t _blank 变电、 HYPERLINK /view/66235.htm \t _blank 输电、 HYPERLINK /view/66240.htm \t _blank 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 HYPERLINK /view/41372.htm \t _blank 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; 厂用电动机选择等等。关键词： 发电厂；变压器；电力系统；电气设备。Abstract By the power generation, substation, transmission, distribution and composition of energy consumption and other aspects of production and consumption systems. Its function is a natural energy through the powerplant into electricity generation, and then the transmission and substation systems and power distribution systems will be supplied to the load center. Main electrical wiring is power plant and substation electrical design of the first part, also constitute an important part of the power system. Determine the main terminal of the power system as a whole and power plants, substations own operation reliability, flexibility and economy are closely related. And selection of electrical equipment, power distribution equipment configuration, relay protection and control of the development have a greater impact. Energy use has penetrated into the social, economic, all areas of life, and in the power structure of the capacity of the total installed capacity of thermal power equipment for 75%. This article is equipped with two sets of 300MW generator in a large part of the initial power plant design, primarily to complete the electrical main wiring design. Including electrical wiring in the form of the main comparison of choice; the main transformer, start / standby transformer and high voltage auxiliary transformer capacity calculation, th