摘要在我国电能行业的大发展大繁荣的基础下，发电、变电、输电、配电等环节组成的整个电力系统已经成为我国的支柱产业，特别是发电行业更是重中之重。作为一种将天然的一次能源通过动力发电装置直接有效地转换为清洁、传递速度快的二次能源（电能）的行业，其重要性可想而知。以2台300MW的发电机组为核心的火力发电厂电气部分一次设计是我本次重点研究的问题。在火电厂中电气主接线设计中，可靠性，经济性和安全性对线路方案选择和主接线上设备选择都有不可替代的影响。本文将从电气主接线方案选取开始，对以主变压器和发电机组为基础的发电厂电气设备做出选择。其次，短路电流的计算作为本设计重点，为设备选型提供了重要理论依据。通过本文设计的火力发电厂电气部分一次设计，不但能为我国高用电企业的飞速发展提供有效保障，更为整体经济发展做出了坚实的厚盾。关键词：发电厂电气主接线短路计算设备选型AbstractBased on the development of Chinese power industry ,Powergeneration,transmission and distribution,the composition of theentire power system has become a pillar industry in nowadaysa kind of industry using generating devices transforming primary energyinto secondary energy(electricity)effectively ,it is obviously important.The electrical part of power plant design with 2 X 300MWgenerating units as the core is my key research.In the thermal powerplant's main electrical wiring design,reliability ,economy and safety ofselection in route have irreplaceable effect.This paper will start from the electrical main wiring schemeselection and make choices about electrical equipment for power plantwhich based on Main transformer and generator set.Secondly,thecalculation of short-circuit current as the focus provides an importanttheoretical basis for the selection of equipment.The thermal power plant electrical design of the first part of thispaper design,not only providing China effective protection for the rapiddevelopment of high energy consumption enterprises,but also made asolid thick shield of the whole economic development.Key words:power plantelectrical wiringshort-circuit calculationequipment selectio目录摘要bstrac.......................................................................................................1绪论11.1火力发电的特点及发电过程1.2火力发电厂的电气一次设计.21.3拟定设计环节和设计要求32电气主接线设计52.1电气主接线设计的原则与要求2.2接线方式简述2.2.1单元接线2.2.2单母线接线…82.2.3单母线分段接线.…82.2.4双母线接线2.2.5双母线分段接线2.3电气主接线方案比对及分析….102.3.1方案一接线分析.112.3.2方案二接线分析…2.3.3方案的选取…132.4厂用电接线设计.….143关于发电机与主变压器3.1发电机的选型.153.2主变压器的型号.163.2.1容量的计算3.2.2绕组连接方式的确定…3.2.3主变压器的具体参数…173.3中性点接地方式简述.17