电力工程基础课设.doc

中北大学 电力工程基础 课程设计说明书 课题名称：某机械厂的高压配电所的设计 组 长： 组 员： 学 院： 专 业： 指导教师： 2015年 6月27日 目录 第一部分 课程设计任务书··································1 第二部分 绪论············································4 1 负荷计算及功率因数初步补偿的计算························4 1.1负荷计算··············································4 1.1.1负荷计算的意义······································4 1.1.2负荷计算的方法······································4 1.1.3各车间负荷的计算····································5 1.1.4所有车间的照明负荷··································7 1.1.5全厂的计算负荷及汇总表······························7 1.2功率因数初步补偿的计算································9 1.2.1功率因数对供电系统的影响····························9 1.2.2功率因数的初步补偿··································9 2 变电所位置与变压器型号的选择··························10 2.1变电所的选择·········································10 2.2变压器型号的选择（台数，容量）··························10 2.2.1变电所主变压器台数的选择···························10 2.2.2变电所变压器型号的选择·····························10 3 主接线方式的选择及图示································11 4 短路电流的计算········································12 4.1短路的基本概念·······································12 4.2短路的原因···········································12 4.3短路后果·············································12 4.4短路形成·············································12 4.5三相短路电流计算的目的·······························14 4.6短路电流的计算·······································14 4.6.1用标幺值计算步骤···································14 4.6.2计算各元件电抗标幺值·······························15 4.6.3两台变压器并列运行时的计算·························16 4.6.4两台变压器分裂运行时的计算·························17 4.6.5短路电流的计算结果·································18 5 无功功率补偿修定······································19 6 厂区高压系统配电设计，进出线的线路结构，敷设方式设计···20 6.1配电系统的接线方式···································20 6.2变压所进出线的选择，敷设方式的设计···················20 6.2.1 0kv高压进线和引入电缆的选择·······················20 6.2.1.1 10kv高压进线的选择校验··························20 6.2.1.2由高压配电室至主变的一段引入电缆的选择校验·······20 6.2.2各车间 380v低压进出线的选择·