1、 I 摘 要 电力系统以发电、变电、输电、配电和用电等环节组成的电能生产与消费的 一个完整的系统。它主要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。 电气主接线也称为电气主系统一次接线，它是发电厂、变电所电气设计的主 体，也是电力系统网络的重要组成部分。电气主接线反映了发电机、变压器、线 路、断路器和隔离开关等有关电气设备的数量、各回路中电气设备的连接关系及 发电机、变压器与输电线路、负荷间以怎样的方式连接，直接关系到电力系统的 可靠性、灵活性和安全性，直接影响发电厂、变电所电气设备的选择，配电装置 的布置，保护与控制方式选择和检修的安全
2、与方便性。 而且电能的使用已经渗 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 6 台 300MW 汽轮发电机的大型火电厂电气一次部分的 初步设计，主要完成了整个电气一次部分主接线的设计。包括电气主接线的形式 的比较、选择；主变压器、高压厂用变压器台数、容量和型号的选择；短路电流 计算和高压电气设的选择与校验; 以及相关的配电装置设计及选择。 关键词关键词： 发电厂，主接线，变压器，短路计算，电气设备，配电装置 II AbstractAbstract From power generation, substation, transmiss
3、ion, distribution and consumption of energy and other aspects of the composition of production and consumption systems. the function is to the natural world through the power of the primary energy into electrical energy power plant, then lose, substation and distribution system will supply electrici
4、ty to the load center. Electrical wiring is the main power plants, electrical substations of the most important part of the design, but also constitute an important part of the power system. Connection to determine the overall power system and power plants, substations running their reliability, fle
5、xibility and economy are closely related. And choice of electrical equipment, power distribution device configuration, relay protection and control of the formulation has a greater impact. The use of energy has infiltrated the social, economic, all areas of life, and in the power structure of Chinas
6、 thermal power equipment capacity of the total installed capacity of 75%. This article is equipped with 6 sets of 300MW turbo-generator of large-scale thermal power plants a part of the preliminary design, mainly to complete the electrical design of the main terminal. Including the electrical wiring of the main forms of comparison, the choice; main transformer, start / back-up transformers and high voltage transformer factory capacity calculation, the number and types of options; short-circu
