低压电缆电压降自动计算.xls

低压电缆电压降自动计算.xls

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电电压压降降的的计计算算对对于于阻阻抗抗位位ZZ的的导导体体，利利用用下下列列公公式式计计算算电电压压降降：

式中k是一个系数，等于：

2，当为单相和两相系统时；，当为三相系统时。

是负载电流（A），如果没有提供其他信息，则应考虑电缆的载流能力。

L是导体的长度（km）。

n是每相并联的导体数量。

r是每千米单根电缆的电阻（/km）。

x是每千米单根电缆的电抗（/km）。

是负载的功率因数，通常，由下列公式计算相对于额定值Ur的百分比：

根据不同的截面积和电缆的构成，以下表格给出了50Hz时单位长度电缆的电阻值和电抗值；当为60Hz时，电抗值应乘以1.2。

当当为为长长电电缆缆时时，根根据据电电压压降降确确定定导导体体截截面面积积的的方方法法：

当为长电缆或特殊设计规范要求限制最大电压降时，使用基于热考虑进行的截面积验证可能出现负结果。

为确定正确的截面积，通过下列公式计算最大。

与表412中的Ux进行比较，选择Ux低于Uxmax所对应的界面接，此截面积即为最小截面积。

）sincos（xrnLkIkZIUbb3cos2cos1sinrUUu%LIUuUbrx%maxbI额定电压Ur（V）：

380额定电压Ur（V）：

380电缆长度L（km）：

0.2系数k：

2电缆构成：

负载电流Ib（A）：

30电缆根数n：

1电缆构成：

负载电流Ib：

30电缆长度L（km）：

0.2功率因数cos：

0.85电缆根数n：

1查表得到的电压降Ux：

1.41每千米单根电缆的电阻r（/km）:

1.43电压降U计算结果（V）:

8.46负载的功率因数cos：

0.85相当于额定值Ur的百分数：

0.022263每千米单根电缆的电抗x（/km）:

0.0817cos2：

0.72251-cos2：

0.2775sin：

0.526783k=2时，电压降U计算结果（V）:

15.10246k=3时，电压降U计算结果（V）:

13.07911相当于k=2时额定值Ur的百分数：

0.039743相当于k=3时额定值Ur的百分数：

0.034419由上面的公式算出的相当于额定值Ur的百分数数值太高时，根据下面的公式计算：

要求的最大允许压降：

0.02额定电压Ur（V）：

400负载电流Ib：

56电缆长度L（km）：

0.14Uxmax：

1.020408比较查表得到的电压比U：

0.81反过来验算的电压降（V）：

6.3504相当于百分比为：

0.0158761.732051单单位位长长度度铜铜电电缆缆的的电电阻阻和和电电抗抗S（mm2）单芯电缆双芯/三芯电缆r（/km）80x（/km）r（/km）80x（/km）1.514.80.16815.10.1182.58.910.1569.080.10945.570.1435.680.10163.710.1353.780.0955102.240.1192.270.0861161.410.1121.430.0817250.8890.1060.9070.0813350.6410.1010.6540.0783500.4730.1010.4830.0779700.3280.09650.3340.0751950.2360.09750.2410.07621200.1880.09390.1910.0741500.1530.09280.1570.07451850.1230.09080.1250.07422400.09430.09020.09660.07523000.07610.08950.0780.075单单位位长长度度铝铝电电缆缆的的电电阻阻和和电电抗抗S（mm2）单芯电缆双芯/三芯电缆r（/km）80x（/km）r（/km）80x（/km）1.524.3840.16824.8780.1182.514.680.15614.960.10949.1770.1439.3580.10166.1120.1356.2280.0955103.6910.1193.740.0861162.3230.1122.3560.0817251.4650.1061.4940.0813351.0560.1011.0770.0783500.7790.1010.7960.0779700.540.09650.550.0751950.3890.09750.3970.07621200.310.09390.3150.0741500.2510.09280.2590.07451850.2030.09080.2060.07422400.1550.09020.1590.07523000.1250.08950.1290.075铜铜电电缆缆在在cos=1cos=1的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.529.625.6330.226.152.517.8215.4318.1615.73411.149.6511.369.8467.426.437.566.55104.483.884.543.93162.822.442.862.48251.781.541.811.57351.281.111.311.13500.950.820.970.84700.660.570.670.58950.470.410.480.421200.380.330.380.331500.310.270.310.271850.250.210.250.222400.190.160.190.173000.150.130.160.14）/（kmAVUx铜铜电电缆缆在在cos=0.9cos=0.9的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.526.7923.227.2823.632.516.1714.0116.4414.24410.158.7910.318.9366.85.896.895.96104.143.584.13.6162.642.282.652.29251.691.471.71.48351.241.081.251.08500.940.810.940.81700.670.580.670.58950.510.440.50.431200.420.360.410.351500.360.310.350.31850.30.260.290.252400.250.220.240.213000.220.190.210.18）/（kmAVUx铜铜电电缆缆在在cos=0.85cos=0.85的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.525.3421.9425.7922.342.515.3113.2615.5513.4749.628.339.768.4560.455.596.535.65103.933.413.953.42162.512.182.522.18251.621.411.631.41351.21.041.191.03500.910.790.90.78700.660.570.650.56950.50.440.490.421200.420.360.40.351500.360.310.350.31850.30.260.290.252400.260.220.240.213000.220.190.210.18）/（kmAVUx铜铜电电缆缆在在cos=0.8cos=0.8的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.523.8820.6824.321.052.514.4412.5114.6612.6949.087.879.217.9866.15.286.165.34103.733.233.743.23162.392.072.392.07251.551.341.551.34351.150.991.140.99500.880.760.870.75700.640.550.620.54950.490.430.480.411200.410.360.390.341500.360.310.340.291850.310.260.290.252400.260.220.240.213000.230.20.210.19）/（kmAVUx铜铜电电缆缆在在cos=0.75cos=0.75的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.522.4219.4222.8119.752.513.5711.7513.7611.9248.547.48.657.4965.744.975.85.02103.523.053.523.05162.261.962.251.95251.471.281.471.27351.10.951.080.94500.840.730.830.72700.620.540.60.52950.480.420.460.41200.410.350.380.331500.350.310.330.291850.30.260.290.252400.260.230.240.213000.230.20.220.19）/（kmAVUx铝铝电电缆缆在在cos=1cos=1的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.548.7742.2349.7643.092.529.3625.4329.9225.91418.3515.8918.7216.21612.2210.5912.4610.79107.386.397.486.48164.654.024.714.08252.932.542.992.59352.111.832.151.87501.561.351.591.39701.080.941.10.95950.780.670.790.691200.620.570.630.551500.50.440.520.451850.410.350.410.362400.310.270.320.283000.250.220.260.22）/（kmAVUx铝铝电电缆缆在在cos=0.9cos=0.9的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.544.0438.1444.8838.872.526.562327.0223.4416.6414.4116.9314.66611.129.6311.299.78106.755.846.815.89164.283.714.313.73252.732.362.762.39351.991.722.011.74501.491.291.51.3701.060.921.060.91950.780.680.780.681200.640.550.630.551500.530.460.530.461850.440.380.440.382400.360.310.350.33000.30.260.30.26）/（kmAVUx铝铝电电缆缆在在cos=0.85cos=0.85的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.541.6336.0542.4236.732.525.1221.7525.5522.12415.7513.6416.0213.87610.539.1210.699.26106.45.546.455.58164.073.524.093.54252.62.252.632.27351.91.651.911.66501.431.241.431.24701.020.881.010.88950.760.660.760.651200.630.540.610.531500.530.460.520.451850.440.380.430.372400.360.310.350.33000.310.270.30.26）/（kmAVUx铝铝电电缆缆在在cos=0.8cos=0.8的的计计算算比比电电压压S（mm2）单芯电缆双芯电缆三芯电缆单相三相单相三相1.539.2233.9639.9534.592.523.6720.524.0720.84414.8512.8615.0913.0769.948.6110.088.73106.055.246.095.27163.853.343