施工现场临时用电设计与计算.doc

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1、施工现场临时用电设计与计算施工现场临时用电设计与计算施工现场临时用电设计与计算一、该施工现场所需用电设备（包括照明）如下：、施工动力用电情况：“大平板钢管架提升机”一台，电动机功率为7.5KW；“小型井架提升机”一台，电动机功率为5.0KW；“混凝土搅拌机”一台，电动机功率为5.5KW；“砂浆搅拌机”二台，每台电动机功率为2.2KW；“平板振动器”二台，每台电动机功率为1.1KW；“插入式振动器”二台，每台电动机功率为1.1KW；“木工圆盘锯”一台，电动机功率为1.1KW；“木工电刨机”一台，电动机功率为0.7KW；“潜水泵”二台，每台电动机功率为1.5KW；“蛙式打夯机”一台，电动机功率为1

2、.5KW；“电焊机”一台，电动机功率为6KW。、照明用电情况：“室内照明”二十盏，每盏功率为0.06KW；“室外照明镝灯”二盏，每盏功率为3KW。计算步骤：二、估计施工用电总容量：施工现场动力容量：P1=7.5+0.5+5.5+22.2+21.1+21.1+1.1+0.7+21.5+1.5=33.1KW电焊机容量：P2=136=10.39KW室内照明容量：P3=200.06=1.2KW室外照明容量：P4=23=6KW总用电量：P=1.05（K1P1cos+ K2P2+ K3P3+ K4P4）=1.05(0.633.10.75+0.610.39+0.81.2+16)=41.658KVA式中cos

3、、K1、K2、K3、K4 均查建筑施工手册上册表3-57 得。施工动力用电采用380V 三相电源，照明用电采用220V 单相电源。依上述选得SL7-50/10 型三相降压变压器，其主要技术数据为：额定容量为50KVA，高压线额定电压为6KV，低压线额定电压为0.4KV.采用三相五线制作Y 接使用（动力）。三、确定配电室位置和配电线路布置：配电室位置详见施工平面布置图，配电线路采用一路，由总配电盘上总闸刀控制。四、配电导线截面选择：为了安全和节约起见，选用BXR 铜芯橡皮绝缘电缆线。、按导线的允许电流选择：由于各种电动机不是同时使用，在这按用电最高峰进行计算。即以浇筑楼板混凝土时并进行填充墙的砌

4、筑来进行计算。Pmax=7.5+5+5.5+22.2+21.1+21.1=26.8KW该路的工作电流为：I 线=KP3U 线cos=（1.050.626.81000）(33800.75)=34.20A(上式中：U 线=380V，cos=0.75)查建筑施工手册上册表3-65，选用BXR 铜芯橡皮绝缘电缆线，导线标称截面为6mm2（导线持续容许电流为58A）。、按允许电压降选择：为了简化计算，全部负荷集中在线路末端来考虑，从配电室盘到线路末端长度约为100m。允许电压降：S=PL/C=1.050.626.8100（775）=4.385mm2（上式中：允许相对电压降=5，导线系数C 查表3-69

5、得C=77）、按机械强度选择：查表3-64 架空线相线专用保护零线最小截面（铜芯）应为6mm2。、导线选择结果：采用BXR 铜芯五芯橡皮绝缘电缆线16mm2+3100mm2+16mm2。即：一条保护零线、三条相线、一条工作零线。注明：配电室内配有30KW 柴油发电机组一台，专供停电时使用。结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！164y6mjgfo4k0avza,5,yy8n2glq4a9ezdf7uf4,ykxhs0w690ehxgccvzhpuzn2hls.p6y4xa6aqnie70qhckhc1552ukun9ipveyd

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