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1、建筑工地施工现场用电计算及导线选择方案本工程所有10mm以上电缆采用五芯铝芯电缆，10mm以下为五芯铜芯电缆。1.1、施工一区计算及导线选择1、确定用电负荷:(1)、塔式起重机Kx = 0.85 Cos = 0.6 tg = 1.33将Jc =40%统一换算到Jc1 =25%的额定容量Pn = 32kWPe = n(Jc/Jc1)1/2Pn = 1(0.4/0.25)1/232 = 40.48 kWPjs = KxPe =0.8540.48 = 34.41kWQjs = Pjs tg=34.411.33 = 45.87 kvar(2)、塔式起重机Kx = 0.85 Cos = 0.6 tg =
2、 1.33将Jc =40%统一换算到Jc1 =25%的额定容量Pn = 32kWPe = n(Jc/Jc1)1/2Pn = 1(0.4/0.25)1/232 = 40.48 kWPjs = KxPe =0.8540.48 = 34.41kWQjs = Pjs tg=34.411.33 = 45.87 kvar(3)、建筑施工外用电梯Kx = 0.85 Cos = 0.6 tg = 1.33Pjs = 0.8511 = 9.35 kWQjs = Pjs tg=9.351.33 = 12.47 kvar(4)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.34
3、 = 1.2 kWQjs = Pjs tg=1.21.02 = 1.22 kvar(5)、自落式混凝土搅拌机Kx = 0.75 Cos = 0.85 tg = 0.62Pjs = 0.755.5 = 4.125 kWQjs = Pjs tg=4.120.62 = 2.56 kvar(6)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.653 = 1.95 kWQjs = Pjs tg=1.951.02 = 1.99 kvar(7)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.653 = 1.95 kWQjs = Pj
4、s tg=1.951.02 = 1.99 kvar(8)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.653 = 1.95 kWQjs = Pjs tg=1.951.33 = 2.6 kvar(9)、交流电焊机Kx = 0.5 Cos = 0.4 tg = 2.29将Jc =50%统一换算到Jc1 =100%的额定容量Pn = Sn Cos = 90.4=3.6kWPe = n(Jc/Jc1)1/2Pn = 1(0.5/1)1/23.6 = 2.55 kWPjs = KxPe =0.52.55 = 1.27kWQjs = Pjs tg=1.272.29 =
5、 2.92 kvar(10)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.35.5 = 1.65 kWQjs = Pjs tg=1.651.02 = 1.68 kvar(11)、灰浆搅拌机Kx = 0.5 Cos = 0.55 tg = 1.52Pjs = 0.52.2 = 1.1 kWQjs = Pjs tg=1.11.52 = 1.67 kvar(12)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.653 = 1.95 kWQjs = Pjs tg=1.951.02 = 1.99 kvar(13)、钢筋弯曲机K
6、x = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.653 = 1.95 kWQjs = Pjs tg=1.951.02 = 1.99 kvar(14)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.653 = 1.95 kWQjs = Pjs tg=1.951.33 = 2.6 kvar(15)、交流电焊机Kx = 0.5 Cos = 0.4 tg = 2.29将Jc =50%统一换算到Jc1 =100%的额定容量Pn = Sn Cos = 90.4=3.6kWPe = n(Jc/Jc1)1/2Pn = 1(0.5/1)1/23.6 =
7、 2.55 kWPjs = KxPe =0.52.55 = 1.27kWQjs = Pjs tg=1.272.29 = 2.92 kvar(16)总的计算负荷计算，总箱同期系数取 Kx = 0.9总的有功功率Pjs = KxPjs = 0.9(34.41+34.41+9.35+1.2+4.12+1.95+1.95+1.95+1.27+1.65+1.1+1.95+1.95+1.95+1.27) = 90.435 kW总的无功功率Qjs = KxQjs =0.9(45.87+45.87+12.47+1.22+2.56+1.99+1.99+2.6+2.92+1.68+1.67+1.99+1.99+2
8、.6+2.92) = 117.306 kvar总的视在功率Sjs = ( Pjs2+Qjs2 )1/2 = (90.4352+117.3062)1/2 = 148.119 kVA总的计算电流计算Ijs = Sjs/(1.732Ue) = 148.119/(1.7320.38) = 225.05 A2、1号干线线路上导线截面及分配箱、开关箱内电气设备选择:在选择前应对照平面图和系统图先由用电设备至开关箱计算，再由开关箱至分配箱计算，选择导线及开关设备。分配箱至开关箱，开关箱至用电设备的导线敷设采用铝橡皮绝缘导线。(1)、塔式起重机开关箱至塔式起重机导线截面及开关箱内电气设备选择（开关箱以下用电器
9、启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx Pe /(1.732Ue Cos) = 140.48/(1.7320.380.6) = 102.5Aii)选择导线选择YJV-435+116 ，直接埋地时其安全载流量为115A。iii)选择电气设备选择开关箱内隔离开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A，漏电保护器为 DZ10L-250/3。(2)、塔式起重机开关箱至塔式起重机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ij
10、s = Kx Pe /(1.732Ue Cos) = 140.48/(1.7320.380.6) = 102.5Aii)选择导线选择YJV-435+116 ，直接埋地时其安全载流量为115A。iii)选择电气设备选择开关箱内隔离开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A，漏电保护器为 DZ10L-250/3。(3)、建筑施工外用电梯开关箱至建筑施工外用电梯导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx Pe /(1.732Ue Cos) = 111/(1.7320.
11、380.6) = 27.86Aii)选择导线选择YJV-425+116 ，直接埋地时其安全载流量为98A。iii)选择电气设备选择开关箱内隔离开关为DZ10-100/3 ，其脱扣器整定电流值为Ir = 80A，漏电保护器为 DZ15L-100/30。(4)、插入式振动器开关箱至插入式振动器导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.7 tg = 1.02Ijs = Kx Pe /(1.732Ue Cos) = 10.8/(1.7320.380.7) = 1.74Aii)选择导线选择YJV-46+14 ，直接埋地时其安全载流量为
12、48A。iii)选择电气设备由于开关控制5台用电器，开关的电流为Ir=1.745.00(台数)= 8.68 A。选择开关箱内隔离开关为DZ5-20/3 ，其脱扣器整定电流值为Ir = 16A，漏电保护器为 DZ15L-100/30。(5)、自落式混凝土搅拌机开关箱至自落式混凝土搅拌机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.85 tg = 0.62Ijs = Kx Pe /(1.732Ue Cos) = 15.5/(1.7320.380.85) = 9.83Aii)选择导线选择YJV-46+14 ，直接埋地时其安全载流量为4
13、8A。iii)选择电气设备选择开关箱内隔离开关为DZ5-20/3 ，其脱扣器整定电流值为Ir = 16A，漏电保护器为 DZ15L-100/30。(6)、钢筋切断机开关箱至钢筋切断机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.7 tg = 1.02Ijs = Kx Pe /(1.732Ue Cos) = 13/(1.7320.380.7) = 1.51Aii)选择导线选择YJV-44+11.5 ，直接埋地时其安全载流量为37A。iii)选择电气设备选择开关箱内隔离开关为Hk1-15/3，漏电保护器为 DZ15L-100/30。
14、(7)、钢筋弯曲机开关箱至钢筋弯曲机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.7 tg = 1.02Ijs = Kx Pe /(1.732Ue Cos) = 13/(1.7320.380.7) = 1.51Aii)选择导线选择YJV-44+11.5 ，直接埋地时其安全载流量为37A。iii)选择电气设备选择开关箱内隔离开关为Hk1-15/3，漏电保护器为 DZ15L-100/30。(8)、木工圆锯开关箱至木工圆锯导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx Pe /(1.732Ue Cos) = 13/(1.7320.380.6) = 7.6Aii)选择导线选择YJV-44+11.5 ，直接埋地时其安全载流量为37A。iii)选择电气设备选择开关箱内隔离开关为Hk1-15/3，漏电保护器为 DZ15L-100/30。(9)、交流电焊机开关箱至交流电焊机导
