三相变压器实验报告

第四次实验报告——三相变压器实验内容1测定变比1.1实验拍照、数据、图表U（V）KUVU（V）KVWU（V）KWUK=1/3(KUV+KVW+KWU)U1U1.1V1U2U1.2V1U1V1.1W1U2V1.2W1U1W1.1U1U2W1.2U14281083.964151053.954081043.923.941.2实验结果分析与理解由空载实验测取变压器的原、副方电压的三组数据，分别计算出变比，然后取其平均值作为变压器的变比K。K=U1U1.1U2／U2U1.2U2实验内容2空载实验2.1实验拍照、数据、图表序号实验数据计算数据U0(V)I0(A)PO(W)UO(V)IO(A)PO(W)cos0U2U1.2V1U2V1.2W1U2W1.2U1I2U10I2V10I2W10PO1P02157.2157.3557.280.0110.0100.0190.320.2257.280.0130.540.492277.0177.2477.090.0180.0170.0240.590.4477.110.0201.030.383398.5597.9597.450.0220.0250.0300.980.7897.980.0261.760.3704109.8108.4109.10.0250.0280.0341.261.57109.10.0292.830.3325115.2113.7113.40.0260.0290.0351.391.69114.10.0303.080.2466131.7130.7130.10.0310.0350.0411.901.93130.80.0363.830.1742.2实验结果分析与理解空载时变压器的损耗主要由两部分组成，一部分是因为磁通交变而在铁心中产生的铁耗，另一部分是空载电流在原绕组中产生的铜耗。由于空载电流数值很小，此时铜耗便可以略去，而决定铁耗大小的电压可达到正常值，故近似认为空损耗就是变压器的铁耗，但实质上二者并不等价实验内容3短路实验3.1实验拍照、数据、图表θ=26℃序号实验数据计算数据UK（V）IK（A）PK（W）UK（V）IK（A）PK（W）cosKU1U1.1V1U1V1.1W1U1W1.1U1I1U1I1V1I1W1PK1PK21141312.50.230.220.200.462.7413.20.223.200.638220.519.5190.320.310.300.925.7819.670.316.700.634322.522.023.00.370.340.351.167.4922.500.358.650.634425.024.527.00.430.360.401.439.4525.500.4010.880.616526.525.029.00.460.370.441.6711.7626.830.4213.430.6883.2实验结果分析与理解由于短路实验所加电压很低，因此这时铁心中磁通密度很低，故铁心损耗可以略去，而决定铜耗大小的电流可达正常值，所以近似认为负载损耗就是变压器铜耗。但仍然只是一种近似。实验内容4纯电阻负载实验4.1实验拍照、数据、图表UUV=U1N=55V；cosj2=1序号U（V）I（A）U1U1.1V1U1V1.1W1U1W1.1U1U2I1U1I1V1I1W1I2121821022821900002204197214205131212123198190208199191818184188180196188302829295177169185177403840394.2实验结果分析与理解纯电阻负载时，变压器各端电压与电流成