电动机直接启动压降计算表格文件下载.xls

1、电动机直接启动压降计算（从变压器起算）变压器变压器至配电盘电缆铜排容量电流电压阻抗%其他负载率 短路阻抗电阻率长度电阻率KVAKV查表本电机除外查表千米查表STedIedUtedUk%0.6-0.8Ztdlm/mkmm/m125312.50.440.60.0510.0800.0060.170计计算算结结果果空载或轻载时电机直接启动条件：#电机容量小于变压器容量的30%，电机端子压降不超过42%，即-Y降压启动电压,其他负载的压降不超过25%。#重载启动时压降不大于15%母母线线%电电机机%总总压压降降%2.542.549.699.6912.2212.22电动机部分电缆应为配电盘至电机之间各级电

2、缆的总电阻电动机电缆电机长度电阻率长度功率 功率因数容量启动倍数 电机阻抗米查表千米KW查表3-7mm/mKmPdcosSdKiZD60.7067731.0030.893.376.56.59电动机直接启动压降计算（从变压器起算）铜排空载或轻载时电机直接启动条件：#电机容量小于变压器容量的30%，电机端子压降不超过42%，即-Y降压启动电压,其他负载的压降不超过25%。#重载启动时压降不大于15%电动机部分电缆应为配电盘至电机之间各级电缆的总电阻低压铜母线单位长度阻抗值（m/m）（/Km）母线规格电阻R电抗X计算阻抗D（mm）2503502503504（100X10）0.02500.15600.

3、18100.15800.18273（100X10）+80X80.02500.15600.18100.15800.18274（80X8）0.03100.17000.19500.17280.19743（80X8）+63X6.30.03100.17000.19500.17280.19743（80X8）+50X50.03100.17000.19500.17280.1974变压器容量小于630KVA时D=250低压线路单位长度阻抗值（m/m）（/Km）S（mm2）1.52.54电阻R铜芯11.4676.884.3电抗X架空线全塑电缆四芯0.1纸绝缘四芯0.098交联四等芯0.097穿管布线0.140.1

4、30.12阻抗值架空线全塑电缆四芯4.3012纸绝缘四芯4.3011交联四等芯4.3011穿管布线11.46796.88124.3017610162535502.8671.7541.0970.7020.5010.3510.40.380.370.360.350.0940.0870.0820.080.0790.0930.0880.0820.0730.070.0920.0850.0820.080.0790.110.10.09线路单位长度等效阻抗计算结果如下：#1.79901.16100.79350.61690.49572.86871.75651.10040.70680.50730.35982.868

5、51.75621.10010.70580.50100.35792.86851.75611.10010.70650.50100.35982.86911.75401.10150.70200.50100.3624低压线路单位长度阻抗值（m/m）（/Km）0.170951201501850.2510.1850.1460.1170.0950.340.330.320.310.30.0780.0790.0760.0690.070.0680.0780.0770.0760.0770.080.42260.37830.35170.33130.31470.26280.20120.16460.11700.09500.26030.18500.16190.13530.09500.26280.20040.16460.14010.25100.18500.16650.11700.09