本科毕业设计__发电厂保护原理及其整定计算的研究.doc

2016届 　 分 类 号： 　　　　　　　　　　　　　　　　　 单位代码：10452 毕业论文（设计） 发电厂保护原理及其整定计算的研究 　　　　　　 姓 名　 　　　杜国利　　 　　 　　　　　　 学 号　　　摘 要 本文最后对新形势下大型发电机变压器保护的发展方向进行了一定展望。 关键字: 发电机；变压器；主保护；整定计算 Abstract With the continuous development of power industry, power plant scale and the capacitance of the generator is also increasing, the attendant is due to the continuous update of relay protection equipment, line protection in China in theory, device manufacturing and operating management have higher level, but is unsatisfactory protection element, its research, operation and management are with the line protection have larger gap. Therefore, how to in the familiar protection principle based on the large generator transformer were reasonable protection configuration and correct setting calculation and improve operation element protection has become a very important issue. Firstly, this paper studies the main power plant equipment protection principle and setting calculation method, which comprises a generator, transformer and generator transformer unit, motors and other main equipment. Secondly the main protection of the generator is mainly introduced the generator main protection analysis, generator rotor turn to turn short circuit or two point grounding analysis, generator other protection analysis. Protection setting calculation of transformer, this paper focuses on two aspects of transformer main protection and backup protection In the end of this paper, the development direction of large generator transformer protection under the new situation is prospected. Keywords: Electric generator; Voltage transformer; Main protection; Setting calculation 目 录 1绪论 4 1.1问题的提出 4 1.2发电厂继电保护及整定计算的发展和现状 5 2 发电机保护原理 5 2.1 发电机差动保护 6 2.1.1 比率制动式纵差保护 6 2.1.2 不完全纵差保护 7 2.1.3 横差保护 8 2.2 发电机转子匝间短路或两点接地保护 8 2.3 发电机失磁保护 9 3变压器保护原理 9 3.1变压器内部故障的主保护整定计算 10 3.1.1 变压器瓦斯保护 10 3.1.2 变压器纵差动保护整定 11