摘要:发电厂和变电所母线是电力系统中的中的一个重要组成部件，发电机的安全运行对保证电力系统的正常工作和电能质量起着决定性的作用；而变压器是电力系统十分重要的供电元件再者，发电机、变压器本身就是十分贵重的电气元件，所以，继电保护装置对大型水电站的正常运行起着至关重要的作用。
本次设计主要是针对2×100MW水电站进行电气一次主接线及继电保护的设计。其中本设计共包括六章，分别对母线、发电机、变压器的继电保护进行详细介绍，并给出相关的整定计算，画出部分二次接线图。所有设计内容在计算机上完成，并在AUTOCAD2007上绘制了电气主接线图、二次回路图，以及对相关电力系统外文的翻译及学习。
关键词：水电站;继电保护;发电机;变压器;母线;二次回路
Abstract: The power plant and the transformer substation bus bar is in an electrical power system's important building block, generator's safe operation to guaranteed that electrical power system's normal work and the electrical energy quality are playing the decisive role; Furthermore but the transformer is the electrical power system very important power supply part, the generator, the transformer itself are the very precious electrical elements, therefore, relay protection installment to large hydroelectric station normal operation very important function.
The design that a design mainly carries on a lord of electricity to connect the line and protective relaying to 2×100 mw water electricity station. This design altogether includes six chapters, to the bus bar, the generator, transformer's relay protection carries on separately introduced in detail, and gives the related installation computation, draws the partial secondary circuit chart. All design contents are compute on board complete, and drew the electricity lord to connect the line diagram and go together with the electricity device cross section diagram and go together with the plane chart of give or get an electric shock the device in AUTOCAD, and to the related electric power system translation and the study of the outside text.
Key word: Hydropower station,; relay protection; generator, ;transformer ; bus bar; secondary circuit
电气主接线不仅是水力发电厂电气部分设计的主要组成部分，而且也是构成电力系统的重要组成部分，它表明了发电机、变压器、线路、断路器的数量和彼此间的连接方式以及运行方式。电气主接线的确定基于电力系统以及发电厂运行时，对可靠性，灵活性，经济性的要求而决定的，对电气设备选择，配电装置布置，以及二次回路的设计都会产生巨大的影响。因此，首先必须综合各方面的影响因素，再进行全面的分析和计算，在可供选择的主接线方案中，通过技术经济比较，合理确定最终的主接线方案。
电气主接线是由电气设备通过连接线，按其功能要求组成接受和分配电能的电路，成为传输强电流，高电压的网络，由于发电、变电、输电和用电是同时进行且同时完成，所以主接线设计的好坏不仅影响电力系统和发电厂本身，同时也影响到了工农业生产和生活。
