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1、电容无功补偿容量的计算1：集中补偿电容容量的计算已知负荷功率为P（单位为kW），补偿前的功率因数为COS1，需提高功率因数到COS2，所需电容器的容量Q（单位为kvar），可按的计算公式： 每kW有功功率所需补偿容量见下表：kvar/kWCos1Cos20.800.820.840.860.880.900.920.940.960.981.00.441.2881.3421.3931.4451.4991.5531.6121.6751.7491.8362.0390.461.1801.2341.2851.3771.3941.4451.5041.5671.6411.7281.9310.481.0761.1
2、301.1811.2331.2871.3411.4001.4631.5371.6421.8270.500.9811.0351.0861.1381.1921.2461.3051.3681.4421.5291.7320.520.8900.9440.9951.0471.1011.1551.2141.2771.3511.4381.6410.540.8080.8620.9130.9651.0191.0731.1321.1951.2691.3561.5590.560.7280.7820.8330.8850.9390.9931.0521.1151.1891.2761.4970.580.6550.7090.7
3、600.8120.8660.9200.9791.0421.1161.2031.4060.600.5830.6370.6880.7400.7940.8400.9070.9701.0441.1311.3340.620.5150.5690.6200.6720.7260.7800.8390.9020.9761.0631.2660.640.4560.5040.5550.6070.6610.7150.7740.8370.9110.9981.2010.660.3880.4420.4930.5450.5990.6530.7120.7750.8490.9361.1390.680.3270.3810.4320.4
4、840.5380.5920.6510.7140.7880.8751.0780.700.2700.3240.3750.4270.4810.5350.5940.6570.7310.8181.0210.720.2120.2660.3170.3690.4230.4790.5360.5990.6730.7600.9630.740.1570.2110.2620.3140.3680.4220.4810.5440.6180.7050.9060.760.1030.1570.2080.2600.3140.3680.4270.4900.5640.6510.8540.780.0520.1060.1570.2090.2
5、630.3170.3760.4390.5130.6000.8030.800.050.100.160.210.270.330.390.460.550.750.820.050.100.160.220.270.340.410.490.700.840.060.110.160.220.290.350.440.650.860.060.110.170.230.300.390.590.880.060.110.180.250.340.540.900.060.120.190.280.482：单台电动机补偿的容量计算为了防止电动机从电源断开瞬间，在惯性作用而尚未停止时，补偿电容对电动机放电而造成绕组绝缘击穿。因此对
6、单台电动机的补偿要求选用的电容器容量不宜过大。因感应电动机空载时的功率因数是最低的，这时即使补偿到最高，其功率因数也是随着负载增加而下降，不可能出现超前现象。所以对于单台电动机的补偿都将电动机空载时的功率因数提高到1。这时补偿电容器的容量QC（kvar）为：其中，U：电动机额定电压，单位kV； I0：电动机空载电流，单位A。单台电动机的补偿容量也可以从下表中查得。电动机容量（kW）电动机转速（r/min）300015001000750600500补偿容量（kvar）7.52.53.03.54.55.07.0103.53.04.56.57.59.0145.04.06.07.58.511.5176.05.06.58.510.014.5227.07.08.510.012.515.5308.58.510.012.515.018.54011.011.012.515.018.023.04513.013.015.018.022.026.05517.017.018.022.027.533.07521.522.025.029.033.038.010025.026.029.033.040.045.011532.532.533.036.045.052.514540.040.042.545.055.065
