一期工程临电施工负荷计算表
序号设备名称设备台数设备装设功率（PS）需要系数（KX）功率因数COS￠tan￠0.881.020.881.021.021.021.021.020.881.730.751.331.331.330.62有功功率（Pjs）2.259.606.7512.001.968.803.6063.007.809.3088.0028.3518.2051.108.00318.71286.84无功功率（Qjs）1.9.795.9412.242.006.163.67.266.8616.0966.0037.7124.2167.9.96329.83296.85视在功率（Sjs）备注1裁板机10.750.753.002钢筋弯曲机412.000.800.703钢筋切断机39.000.650.754卷扬机215.000.800.705平板振动器22.800.700.706插入式振动器1011.000.800.707加压泵26.000.600.708砼输送泵190.000.700.709砼搅拌机412.000.650.7510塔吊131.000.300.5011砼搅拌站160.000.550.8012对焊机181.000.350.6013交流电焊机252.000.350.6014电渣压力机2146.000.350.6015照明20.000.400.85合计35650.80 取k∑Pp=0.9，k∑Qq=0.9（高压侧有功、无功同时系数均取0.90）456.65412.80 自然功率因数COS￠1=Pjs1/Sjs1=286.84/412.8=0.69，tan￠1=1.05，经无功补偿后功率因数达到COS￠2=0.9，tan￠2=0.48，则补偿容量Qc=Pjs1*（tan￠1-tan￠2）=286.84*（1.05-0.48）=163.50kvar，则补偿后的总视在功率:Sjs2=√（Pjs12+QjS22）=√（286.842+（296.85-163.50）2）=316.32kVA。故选择315kVA的变压器。pjs=sjs×cos￠,Qjs=pjs×tan￠
