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1、高新项目一、二期施工用电负荷计算高新项目一、二期施工用电负荷计算一、计算方法：一、计算方法：1.1.采用需要系数法计算：采用需要系数法计算：有功功率计算公式：Pjs=KxPe（kw）无功功率计算公式：Qjs=Pjstg（kvar）视在功率计算公式：Sjs=Pjs2Qjs2=Pjs（kvA）cos其中：Pjs表示有功功率；Qjs表示无功功率；Sjs表示视在功率；Pe表示用电单位设备总容量；Kx表示需要系数；cos表示用电单位设备功率因数；tg表示cos相应的正切值；2.2.施工用电计划（参见上附表一）：施工用电计划（参见上附表一）：联系工作制电动机的设备功率等于额定功率；对反复、短时、断续工作的
2、用电设备的设备容量要进行换算。对反复、短时工作制电机的设备容量(如塔吊),Pe 是指统一换算到暂载率Jc=25%(用Jc25 表示)时的额定功率,即:Pe=式中:Pn电动机铭牌额定功率,kW;JC电动机铭牌暂载率。对断续工作制设备(如电焊装置)的设备容量是指暂载率换算到100%的额定功率,即:式中:SN电焊机铭牌容量,kVA;JCN电焊机铭牌暂载率;cosN额定功率时功率因数。二、负荷计算：二、负荷计算：负荷计算采用表格的形式列出，具体参见附表：三、变压器的容量计算、选择：三、变压器的容量计算、选择：(1)(1)施工电动机用电总有功功率为：施工电动机用电总有功功率为：220.1220.1KWK
3、W，总无功功率为，总无功功率为224.33kvar224.33kvar：；电焊机用：；电焊机用电总有功功率为：电总有功功率为：41.06KW41.06KW，无功功率为：，无功功率为：41.87kvar41.87kvar；(2)(2)照明估算为照明估算为19.819.8KWKW；无功功率为：；无功功率为：10.08kvar10.08kvar；（3 3）总有功功率：）总有功功率：220.1+41.06+19.8=280.95kw220.1+41.06+19.8=280.95kw；总无功功率：总无功功率：224.33+41.87+10.08=276.28kvar224.33+41.87+10.08=
4、276.28kvar则总的视在功率为：则总的视在功率为：Sjs=Pjs2Qjs2=280.952276.282=398.89kvA398.89kvA；（4 4）同时使用系数取：）同时使用系数取：0.90.9；总有功功率为：；总有功功率为：280.95x0.9=252.86kw280.95x0.9=252.86kw；总无功功率为：总无功功率为：280.95x0.9=248.65kvar280.95x0.9=248.65kvar；总视在功率为：总视在功率为：398.89x0.9=359KW398.89x0.9=359KW。则功率因数为：则功率因数为：cos=Pjs=252.86/359=0.7=2
5、52.86/359=0.7；Sjs这样低的功率因数，会导致变压器的容量选择偏大，又会增大供电线路这样低的功率因数，会导致变压器的容量选择偏大，又会增大供电线路的电压损失（即：影响电压质量）的电压损失（即：影响电压质量），所以必须改善功率因数。方法是在，所以必须改善功率因数。方法是在变电所装设移相电容柜进行无功补偿，补偿总量为：变电所装设移相电容柜进行无功补偿，补偿总量为：150kvar150kvar。补偿后的无功功率为：补偿后的无功功率为：98.65kvar98.65kvar；则补偿后的视在功率为：则补偿后的视在功率为：Sjs=Pjs2Qjs2=252.862(248.65150)2=271.
6、42kvA=271.42kvA，补偿后的功率因数为：补偿后的功率因数为：cos=252.86/271.42=0.93=252.86/271.42=0.93 (5)(5)施工现场生活办公用电负荷要考虑实际情况施工现场生活办公用电负荷要考虑实际情况,正确评估正确评估,最好能列项统计负荷最好能列项统计负荷,当无法统计时当无法统计时,应考虑总容量应考虑总容量8%8%10%10%作为生活办公用电量。作为生活办公用电量。(6)(6)总视在功率：总视在功率：q=271.42xq=271.42x（1+0.081+0.08）=293.13 kvA=293.13 kvA则变压器容量的选择为：则变压器容量的选择为：
7、P=1.10P=1.10P=1.1x293.13=322.45kvAP=1.1x293.13=322.45kvA按照以上结果可以选择一台按照以上结果可以选择一台400KVA400KVA的变压器，的变压器，但由于采用需要系数法计算的结果偏小，但由于采用需要系数法计算的结果偏小，所以应该选择一台所以应该选择一台500KVA500KVA的变压器。的变压器。一期计算表：一期计算表：设备名称塔吊 50m交流弧焊机对焊机井架施工电梯砼输送泵合灰机搅拌机振动棒振动板高压水泵钢筋弯曲机钢筋切断5.007.001.001.005.000.700.750.883.507.000.700.750.884.903.0
8、84.31HJ20080m21.003.000.6033.900.350.701.0211.8712.10型号额定功数量暂 载换后功率需要系数KxcoTg有功功率负荷计算无功功率视在功率率（kw）（台）率QT80A52.001.000.2552.000.300.701.0215.6015.91100.001.000.5049.500.350.701.0217.3317.6711.0030.0032.206.007.503.003.3030.003.000.002.002.002.003.003.001.0033.000.350.651.1711.5513.510.000.350.651.170
9、.000.0064.400.600.701.0238.6439.4112.000.600.651.177.2015.000.600.651.179.009.000.400.701.023.609.900.400.701.023.968.4210.533.674.0430.000.700.701.0221.0021.42机卷扬机木工圆盘锯木工刨床割管机套丝机液压弯管机手电钻电动式压泵砂轮切割机管道泵电锤手持电砂轮钨灯镝灯总计乘 0.9 的同时系数补偿补偿后1.101.003.503.009.002.003.300.700.750.882.319.000.901.008.102.030.0010.
10、083.006.003.001.001.002.003.000.700.750.882.106.000.700.750.884.206.000.700.750.884.201.853.703.702.301.002.300.700.750.881.611.421.001.101.003.001.000.700.750.880.703.300.700.750.882.310.622.033.003.003.001.003.003.001.001.009.000.600.701.025.409.000.600.701.025.403.000.700.750.882.101.000.700.750.
11、880.705.515.511.850.627.501.007.500.250.651.171.882.197.000.900.521.606.30391.10347.50195.45195.18276.22312.75351.990.71175.90175.66248.60-1000.92175.9075.66191.48二期计算表：二期计算表：需要设备名称额定功数量暂载换后系cos塔吊 50m交流弧焊机对焊机井架施工电梯砼输送泵合灰机搅拌机振动棒21.00100.0011.0030.0032.206.007.503.003.000.6033.900.350.701.0211.871.000
12、.5049.500.350.701.0217.333.000.001.002.002.002.0033.000.350.651.1711.550.000.350.651.170.0032.200.600.701.0219.3212.000.600.651.177.2015.000.600.651.179.006.000.400.701.022.4012.1017.6713.510.0019.718.4210.532.4516.9524.7517.770.0027.6011.0813.853.43率（kw）（台）52.00率功率数KxTg有功功率负荷计算无功功率15.91视在功率22.291.0
13、00.2552.000.300.701.0215.60振动板高压水泵钢筋弯曲机钢筋切断机卷扬机木工圆盘锯木工刨床割管机套丝机液压弯管机手电钻电动式压泵砂轮切割机管道泵电锤手持电砂轮钨灯镝灯总计乘 0.9 的同时系数补偿补偿后3.3030.002.001.006.600.400.701.022.6430.000.700.701.0221.002.6921.423.7730.005.001.005.000.700.750.883.503.084.677.007.501.001.007.000.700.750.884.907.500.250.651.171.884.312.196.532.883.0
14、03.003.001.003.003.001.001.009.000.600.701.025.409.000.600.701.025.403.000.700.750.882.101.000.700.750.880.705.515.511.850.627.717.712.800.931.001.101.003.001.000.700.750.880.703.300.700.750.882.310.622.030.933.082.301.002.300.700.750.881.611.422.153.006.003.001.001.002.003.000.700.750.882.106.000.7
15、00.750.884.206.000.700.750.884.201.853.703.702.805.605.601.101.003.503.006.001.003.300.700.750.882.316.000.901.005.402.030.005.043.085.406.063.500.900.521.603.15346.10347.50167.76167.86239.42312.75311.490.70150.98151.08215.48150.98-8071.08166.880.90一、二期计算汇总表：一、二期计算汇总表：设备名称塔吊 50m交流弧焊机对焊机井架额定功率（kw）522
16、110011数量2616暂载换后总需要功率KW10467.849.566系数Kx0.30.350.350.350.250.60.5功率因数Tgco0.70.70.71.02有功功率无功功率31.8224.217.6727.03视在功率44.5733.924.7535.54（台）率%31.21.0223.731.0217.3323.10.651.17施工电梯砼输送泵合灰机搅拌机振动棒振动板高压水泵钢筋弯曲机钢筋切断机卷扬机木工圆盘锯木工刨床割管机套丝机液压弯管机手电钻电动式压泵砂轮切割机管道泵电锤手持电砂轮钨灯镝灯电动机总电焊总照明总总计乘 0.9 的同时系数补偿补偿后3032.267.533.
17、330577.5333111.12.33631.113.5032255111133111622246152096.612151516.530577.5993116.64.6612126.61570.350.60.60.60.40.40.70.70.70.250.60.60.70.70.70.70.70.70.70.70.70.90.90.651.170.70.651.170.651.170.70.70.71.021.021.0207.2966.6213.54.91.885.45.42.10.70.74.623.224.28.48.44.6213.56.341.0619.8059.128.421
18、0.536.126.7321.423.084.312.195.515.511.850.620.624.072.833.77.397.394.07010.0841.8710.08-150082.811.0813.858.579.43304.676.532.887.717.712.80.930.936.164.295.611.211.26.1613.512.123591.0257.960.750.880.750.880.651.170.70.71.021.020.750.880.750.880.750.880.750.880.750.880.750.880.750.880.750.880.750.8810.521.6445.4117.322526.23220.1224.33347.5312.75584.7280.95276.28398.89252.86248.650.70.93252.8698.65271.42