35kv工厂降压电气系统设计.doc

学号： 常 州 大 学 毕业设计（论文） （2012届） 题 目 学 生 学 院 专业班级 校内指导教师 专业技术职务 校外指导老师 专业技术职务 二○  35kV工厂降压电气系统设计 电力系统的发展是研究开发与生产实践相互推动、密切结合的过程。电力系统的研究与开发，还在不同程度上直接或间接地对于信息、控制和系统理论以及计算技术起了推动作用。 The design of 35kV factory’s electrical system Abstract： The development of the power system is the process which development and production practices to promote each other closely. The factory power design must conform to the relevant provisions of the National Institute of Standards. This text designs a 35KV electrical system according to the factory load and the requirements of the Industrial Park, including 35KV and 6KV voltage levels. The main content of the paper which include the load calculation, the main line connection, the selection of high-voltage equipments, the short circuit current calculation and the relay protection of the line. There are some detailed explanations for parameter of the component. For example: selection for transformers, circuit breakers and current transformers, the other high-voltage components and the relay protection. The main line connection and the selection of the final components displayed intuitively by CAD drawings, and detailed description of design elaborate in the last chapter. Key words： Tload calculations, selection of transformer, the main line connection, short-circuit current calculation, the selection of electrical equipment and the relay protection目 录 摘 要： I 1 绪论 1 1.1 课题的研究意义 2 1.2 国内外研究现状 2 1.3 发展趋势 2 1.3.1 做好电力规划，加强电网建设 3 1.3.2 联合系统 3 1.3.3 IT技术 3 2 负荷计算 4 2.1 负荷计算的意义 4 2.2 负荷计算过程 4 2.3 功率因数的补偿 6 2.3.1 提高功率因数的意义 7 2.3.2 功率因数的补偿方式 7 3 电力变压器的选择 9 3.1 电力变压器选择遵循的原则 9 3.2 电力变压器的型式选择 9 3.3 电力变压器的台