机械加工车间供配电及设计.doc

目录 设计任务·······················································1 设计要求·······················································1 设计目的·······················································1 二、车间用电计算负荷··················································1 （一）电力负荷的概念及车间概况········································1 （二）计算负荷的含义及其确定方法······································1 三、供电方式及主接线设计··············································6 （一）车间供电方式的确定··············································6 （二）车间供电主接线设计··············································7 四、短路计算及设备选择················································8 （一）电源供电系统短路电源计算········································8 （二）设备选择························································10 五、配电柜设计························································10 六、电气平面布局······················································13 七、致谢······························································13 参考文献······························································14 附录··································································15 ???????????????????????????????????????????? 机械加工车间供配电设计 摘??要?： 根据设计内容及要求，分析机械加工车间的负荷性质、负荷大小和负荷的分布情况，设计出主变压器的主接线方式，解决该机械加工车间车间负荷及负荷可靠性的问题。再通过短路电流的计算，从而选择合适的导线电缆，按所得计算结果选择低压设备。实现安全、可靠、优质、经济的供电，增加产量,提高产品质量，提高劳动生产率,降低生产成本为目的。完成对机械加工车间供配电系统的设计。? 关键词：? ?负荷计算；供电方式；短路计算；低压配电系统 一、设计任务 （一）设计要求 通过提供的简单数据设计出具体可行的工厂供配电系统，使得设计具有一定的可行性。通过所学习的计算负荷的计算、供电方式及短路计算等。设计出所要求的设计内容。 二、车间用电计算负荷 （一）电力负荷的概念及车间概况? 1.电力负荷的概念 在电力系统中，电气设备所需用的电功率称为负荷或电力（W或KW）。由于电功率分为视在功率、有功功率和无功功率，?一般用电流表示的负荷，实际上是对应视在功率而言。 电力负荷又称电力负载。它有两种含义：一是指耗用电能的用电设备或用电单位，如说重要负荷、不重要负荷、动力负荷、照明负荷等。另一种是指用电设备或用电单位所耗用的电功率或电流大小，如说轻负荷（轻载）、重负荷（重载）、空负荷（空载）、满负荷（满载）等。电力负荷的具体含义视具体情况而定。电力负荷的分级按用户电力负荷的重要性及要求对其供电连续性和可靠性程度的不同，一般将电力负荷分三等级。一级负荷、二级负荷、三级负荷。? 三级负荷?：所有不属于一级和二级负荷的电能用户均属于三级负荷。三级负荷对供电无特殊要求，允许较长时间停电，可采用单回路供电。 2.机械加工车间概况 编号 用电设备名称 数量 铭牌上额定功率 功率因数 备注 1 冷加工机床 0 合计KW 0.14~ 0.16 0.5 2 吊车组 1 10.5KW 0.12 FC=25% 3 1号电焊机 1 22KVA 0.6 FC=60% 4 2号电焊机 2 8.95KVA 0.6 FC=100% (1)本车间的负荷性质?