某大学供电系统设计.doc

学 号 毕业设计说明书 某大学供电系统设计 学生姓名 专业名称 电气工程及其自动化 指导教师 电子与信息工程系 年月日  某大学供电系统设计 The Power System Designing for XX University 摘　　要 通过对设计任务工程背景的分析，确定了各变电所高低压主接线结构，并根据电源情况、负荷水平与功率因数要求等条件对全系统进行了详细设计。首先，计算实际负荷，选择10kV供电用变压器。届时已考虑到无功功率补偿因素，由此可以免去部分迭代过程，计算较为简便。在进行上述设计过程中，确定了无功功率补偿容量，得出计算负荷，由此选择线缆。根据总计算负荷选择35kV供电用变压器并进行无功功率补偿。其次，通过对系统的短路计算分析，选择高低压断路器、高压隔离开关、开关柜和互感器。再次，对35kV和10kV变电所的平面布置、照明、接地和防雷进行设计。最后，根据系统需求进行了计量、测量、保护与控制等二次回路设计。 关键词：供电系统；负荷计算；短路计算；继电保护 ABSTRACT This design determined the high and low voltage main structure for each substation by the actual situation of the project, and finished detail for the entire system according to the power situation, the load level, the power factor and other conditions. Firstly, the 10kV power transformers were selected by the actual load calculated. The reactive power compensation was considered when selected the 10kV power transformers. A part of iterative process was removed, so calculation is relatively simple. In the course of that, calculation of the compensation capacity, power load, cable standard were selected. 35kV power transformers was selected base on the total power load , the reactive power compensation was proceed. Secondly, high and low voltage circuit breakers, high voltage isolation switch, switch cabinets and transformers were choosed through analyzes for system short-circuit calculation. Thirdly, layout, lighting, grounding and lightning protection for 35kV and 10kV substation were devised. Finally, the secondary circuit with estimate, measurement, protection and control were devised according to the system requirements. Key words: Power system; Load calculation; Short-circuit calculation; Relay protection 目 录 第 1 章 设计内容概况 1 1.1设计原始依据 1 1.1.1全部用电设备负荷情况 1 1.1.2电源情况 1 1.1.3气象及其它资料 1 1.2设计内容和要求 1 1.3设计方法和步骤 3 1.3.1设计原则和方法 3 1.3.2设计步骤 3 第 2 章 供电系统结构及变电所主接线结构设计 4 2.1供电系统结构设计 4 2.1.1 35kV变电所主接线结构方案选择 4 2.1.2 10kV变电所主接线结构方案选择 7 2.2 变配电站的站用电源 7 第 3 章 系统的负荷分析及主设备选择 8 3.1 系统负荷分析概述 8 3.1.1系统的计算负荷 8 3.1.2无