河南四建股份有限公司 通许县产业聚集区30万㎡厂区2#、3#、4#楼临时用电施工组织
设计
Kx = 0.70，Cosφ = 0.70，tgφ = 1.02 Pjs = Kx×Pe = 0.70× 3.00 = 2.10kW Qjs = Pjs×tgφ = 2.10× 1.02 = 2.14kVar
(61)水泵组
Kx = 0.70，Cosφ = 0.70，tgφ = 1.02 Pjs = Kx×Pe = 0.70× 15.00 = 10.50kW Qjs = Pjs×tgφ = 10.50× 1.02 = 10.71kVar
(62)钢筋室外加工照明组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 8.00 = 8.00kW Qjs = Pjs×tgφ = 8.00× 0 = 0.00kVar
(63)木材加工模板照明组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 8.00 = 8.00kW Qjs = Pjs×tgφ = 8.00× 0 = 0.00kVar
(64)警卫照明(1000W/km)组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 10.00 = 10.00kW Qjs = Pjs×tgφ = 10.00× 0 = 0.00kVar
(65)塔式起重机_QTZ63组
Kx = 0.30，Cosφ = 0.70，tgφ = 1.02 将Jc = 40%统一换算到Jc = 25%的额定容量
Pe = n×(Jc/Jc1)1/2×Pn = 1×(0.40/0.25)1/2×44.00 = 55.66kW Pjs = Kx×Pe = 0.30× 55.66 = 16.70kW Qjs = Pjs×tgφ = 16.70× 1.02 = 17.03kVar
(66)插入式振动器_ZX50C组
Kx = 0.70，Cosφ = 0.68，tgφ = 1.08 Pjs = Kx×Pe = 0.70× 2.20 = 1.54kW Qjs = Pjs×tgφ = 1.54× 1.08 = 1.66kVar
(67)钢筋调直机组
Kx = 0.70，Cosφ = 0.40，tgφ = 2.29 Pjs = Kx×Pe = 0.70× 2.80 = 1.96kW Qjs = Pjs×tgφ = 1.96× 2.29 = 4.49kVar
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河南四建股份有限公司 通许县产业聚集区30万㎡厂区2#、3#、4#楼临时用电施工组织
设计
(68)钢筋切断机组
Kx = 0.70，Cosφ = 0.40，tgφ = 2.29 Pjs = Kx×Pe = 0.70× 5.50 = 3.85kW Qjs = Pjs×tgφ = 3.85× 2.29 = 8.82kVar
(69)钢筋调直切断机_GT6/8组
Kx = 0.70，Cosφ = 0.40，tgφ = 2.29 Pjs = Kx×Pe = 0.70× 5.50 = 3.85kW Qjs = Pjs×tgφ = 3.85× 2.29 = 8.82kVar
(70)钢筋弯曲机组
Kx = 0.70，Cosφ = 0.40，tgφ = 2.29 Pjs = Kx×Pe = 0.70× 1.00 = 0.70kW Qjs = Pjs×tgφ = 0.70× 2.29 = 1.60kVar
(71)交流电焊机_BX3-120-1组
Kx = 0.45，Cosφ = 0.45，tgφ = 1.98
将Jc = 40%统一换算到Jc = 100%的额定容量
Pe = n×(Jc/Jc1)1/2×Pn = 1×(0.40/1.00)1/2×4.05 = 2.56kW Pjs = Kx×Pe = 0.45× 2.56 = 1.15kW Qjs = Pjs×tgφ = 1.15× 1.98 = 2.29kVar
(72)圆盘锯组
Kx = 0.70，Cosφ = 0.70，tgφ = 1.02 Pjs = Kx×Pe = 0.70× 5.00 = 3.50kW Qjs = Pjs×tgφ = 3.50× 1.02 = 3.57kVar
(73)灰浆搅拌机_UJ325组
Kx = 0.70，Cosφ = 0.70，tgφ = 1.02 Pjs = Kx×Pe = 0.70× 3.00 = 2.10kW Qjs = Pjs×tgφ = 2.10× 1.02 = 2.14kVar
(74)水泵组
Kx = 0.70，Cosφ = 0.70，tgφ = 1.02 Pjs = Kx×Pe = 0.70× 12.00 = 8.40kW Qjs = Pjs×tgφ = 8.40× 1.02 = 8.57kVar
(75)钢筋室外加工照明组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 8.00 = 8.00kW
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河南四建股份有限公司 通许县产业聚集区30万㎡厂区2#、3#、4#楼临时用电施工组织
设计
Qjs = Pjs×tgφ = 8.00× 0 = 0.00kVar
(76)警卫照明(1000W/km)组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 10.00 = 10.00kW Qjs = Pjs×tgφ = 10.00× 0 = 0.00kVar
(77)木材加工模板照明组
Kx = 1.00，Cosφ = 1.00，tgφ = 0 Pjs = Kx×Pe = 1.00× 8.00 = 8.00kW Qjs = Pjs×tgφ = 8.00× 0 = 0.00kVar
(78)总的计算负荷计算，干线同期系数取 Kx = 0.90 总的有功功率 Pjs = 1.1×Kx×ΣPjs =
1.1×0.90×(2.10+16.70+13.20+7.35+10.50+9.00+1.96+3.85+0.70+2.80+3.00+3.50+3.85+4.20+1.26+8.00+4.00+20.00+8.00+8.00+8.00+1.00+5.00+1.96+16.70+3.30+0.77+22.54+3.85+0.70+2.80+3.50+2.10+8.40+1.05+16.70+3.30+1.54+2.80+1.96+2.10+3.00+3.50+3.85+1.54+1.05+8.00+8.00+10.00+16.70+3.30+2.31+1.96+3.85+0.70+1.15+2.80+2.10+3.50+2.10+10.50+8.00+8.00+10.00+16.70+1.54+1.96+3.85+3.85+0.70+1.15+3.50+2.10+8.40+8.00+10.00+8.00) = 423.41kW
总的无功功率 Qjs =1.1×Kx×ΣQjs =
1.1×0.90×(2.14+17.03+13.47+7.93+11.32+20.62+4.49+8.82+1.60+6.42+5.95+3.57+3.93+4.28+1.29+0.00+0.00+0.00+0.00+0.00+0.00+0.00+0.00+2.00+17.03+3.37+0.83+24.30+8.82+1.60+6.42+3.57+2.14+8.57+1.07+17.03+3.37+1.66+6.42+4.49+4.81+5.95+3.57+3.93+1.57+1.07+0.00+0.00+0.00+17.03+3.37+2.49+4.49+8.82+1.60+2.29+6.42+2.14+3.57+2.14+10.71+0.00+0.00+0.00+17.03+1.66+4.49+8.82+8.82+1.60+2.29+3.57+2.14+8.57+0.00+0.00+0.00) = 366.83kVar
总的视在功率
Sjs = (Pjs2+Qjs2)1/2 = (423.412+366.832)1/2 = 560.21kVA 总的计算电流计算
Ijs = Sjs/(1.732×Ue) = 560.21/(1.732×0.38) = 851.18A
2.3、选择变压器
根据计算的总的视在功率选择SL7-800/10 型三相电力变压器，它的容量为800.00kVA≥560.21kVA×1.20(增容系数)能够满足使用要求，其高压侧电压为10.00kV同施工现场外的高压架空线路的电压级别一致。
2.4、选择总箱的进线截面及进线开关
(1)选择导线截面：
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河南四建股份有限公司 通许县产业聚集区30万㎡厂区2#、3#、4#楼临时用电施工组织
设计
i) 按安全载流量：
上面已经计算出总计算电流Ijs = 851.18A ii) 按允许电压降：
S = 1.1×Kx×Σ(PL)/C△U = 1.1 ×0.90×21604.80/(77.00×5.00) = 55.56mm2 iii) 根据前面两条：
电缆线空气明敷，铜芯聚氯乙烯绝缘电缆线VV3×300+2×150 ，其安全载流量为474A，截面面积300mm2，不能能够满足使用要求。
(2)选择总进线开关：DZ10-600/3 ，其脱扣器整定电流值为Ir = 480A。 (3)选择总箱中漏电保护器：未选择。
2.5、2#楼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。动力箱至开关箱，开关箱至用电设备采用铜芯聚氯乙烯绝缘电缆线埋地敷设。照明箱至开关箱，开关箱至用电设备采用铜芯橡皮绝缘导线架空敷设。
(1)蛙式夯土机_HW-32开关箱至蛙式夯土机_HW-32导线截面及开关箱内电气设备选择 i)计算电流
Kx 取 1.0，Cosφ = 0.70
Ijs = Kx×Pe/(1.732×Ue×Cosφ) = 1.0×1.50/(1.732×0.38×0.70) = 3.26A ii)选择导线
按允许电压降：
S = Kx×Σ(PL)/C△U = 1.0×4.50/(77.00×5.00) = 0.01mm2 选择BX-3×1+2×6，空气明敷时其安全载流量为21A。 iii)选择电气设备
选择开关箱内开关为DZ5-20/3 ，其脱扣器整定电流值为Ir = 16A。 漏电保护器为ZBM1-63/10 。
(2)塔式起重机_QTZ63开关箱至塔式起重机_QTZ63导线截面及开关箱内电气设备选择 i)计算电流
Kx 取 1.0，Cosφ = 0.70
Ijs = Kx×Pe/(1.732×Ue×Cosφ) = 1.0×55.66/(1.732×0.38×0.70) = 120.81A ii)选择导线
按允许电压降：
S = Kx×Σ(PL)/C△U = 1.0×132.00/(77.00×5.00) = 0.34mm2 选择BX-3×25+2×16，空气明敷时其安全载流量为145A。 iii)选择电气设备
选择开关箱内开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A。 漏电保护器为ZBM1-225/125 。
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河南四建股份有限公司 通许县产业聚集区30万㎡厂区2#、3#、4#楼临时用电施工组织
设计
(3)双笼电梯开关箱至双笼电梯导线截面及开关箱内电气设备选择 i)计算电流
Kx 取 1.0，Cosφ = 0.70
Ijs = Kx×Pe/(1.732×Ue×Cosφ) = 1.0×44.00/(1.732×0.38×0.70) = 95.50A ii)选择导线
按允许电压降：
S = Kx×Σ(PL)/C△U = 1.0×132.00/(77.00×5.00) = 0.34mm2 选择BX-3×16+2×6，空气明敷时其安全载流量为110A。 iii)选择电气设备
选择开关箱内开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A。 漏电保护器为DZ10L-100/3 。
(4)插入式振动器ZX70开关箱至插入式振动器ZX70导线截面及开关箱内电气设备选择 i)计算电流
Kx 取 1.0，Cosφ = 0.68
Ijs = Kx×Pe/(1.732×Ue×Cosφ) = 1.0×1.50/(1.732×0.38×0.68) = 3.35A ii)选择导线
按允许电压降：
S = Kx×Σ(PL)/C△U = 1.0×4.50/(77.00×5.00) = 0.01mm2 选择BX-3×1+2×6，空气明敷时其安全载流量为21A。 iii)选择电气设备
选择开关箱内开关为DZ5-20/3 ，其脱扣器整定电流值为Ir = 16A。 漏电保护器为ZBM1-63/10 。
(5)自落式混凝土搅拌机_JD350开关箱至自落式混凝土搅拌机_JD350导线截面及开关箱内电气设备选择
i)计算电流
Kx 取 1.0，Cosφ = 0.68
Ijs = Kx×Pe/(1.732×Ue×Cosφ) = 1.0×15.00/(1.732×0.38×0.68) = 33.52A ii)选择导线
按允许电压降：
S = Kx×Σ(PL)/C△U = 1.0×45.00/(77.00×5.00) = 0.12mm2 选择BX-3×2.5+2×6，空气明敷时其安全载流量为35A。 iii)选择电气设备
选择开关箱内开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A。 漏电保护器为DZ15L-40/3 。
(6)钢筋对焊机开关箱至钢筋对焊机导线截面及开关箱内电气设备选择 i)计算电流
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