轧钢厂供电系统设计.doc

摘要 工厂供电系统就是将电力系统的电能降压再分配电能到各个厂房或车间中去，它由工厂降压变电所，高压配电线路，车间变电所，低压配电线路及用电设备组成。工厂总降压变电所及配电系统设计，是根据各个车间的负荷数量和性质，生产工艺对负荷的要求，以及负荷布局，结合国家供电情况。解决对各部门的安全可靠，经济技术的分配电能问题。其基本内容有以下几方面：车间负荷计算以及无功功率补偿，导线类型选择, 变配电所位置的电气设计和所址选择, 短路电流的计算及继电保护, 电气设备的选择,车间变电所位置和变压器数量、容量、类型的选择等。关键词：短路电流计算电气设备选择Abstract The factory power supply system is to decline the electric power of electric power system to press to assign electric power again to go to in each factory premises or the car, it is decline by the factory to press a substation, the high pressure goes together with electric wire road, car substation, the low pressure goes together with electric wire road and uses electricity equipments to constitute.The factory always declines to press a substation and goes together with an electricity system design, is the request which produces a craft to the burden according to burden amount and property of each car, and burden layout, combine a national power supply circumstance.Resolve the safe credibility to each section, economy technical llotment electric power problem.It the basic contents have several aspects as follows:Car burden calculation and have no achievement power compensate, lead a line type choice, change to go together with electricity to design the electricity of the position and address choice, short-circuit electric current of calculation and after electricity protection, the choice of electricity equipments, car the choice of the substation position and transformer amount, capacity, type etc. Keywords: The electricity is a part，electricity equipments choice， the lord changes to protect 摘要 I Abstract II 第一章绪论 1 1.1供电的含义及要求 1 1.2供电设计一般原则 2 1.3钢厂负荷性质 2 1.4本设计的要求 3 第二章负荷计算与无功补偿 5 2.1负荷计算的意义 5 2.2负荷计算的方法 5 2.3计算过程 6 2.4无功补偿的原理 9 2.5无功补偿的意义 9 2.6无功补偿计算 10 2.6.1 侧： 10 2.6.2 侧： 11 第三章电气主接线设计 13 3.1电气主接线的概述 13 3.2电气主接线的设计原则 13 3.3电气主接线设计的基本要求 14 3.4电气主接线方案 14 第四章 变压器的选择 16 4.1变压器台数的确定原则 16 4.2变压器的分配 16 4.3变压器容量的确定 16 4.4动力变压器选择 18 第五章短路电流的计算 20 5.1短路电流的概述 20 5.2短路电流产生原因 20 5.3短路电流危害 21 5.4短路的