Question

一台额定容量为 50KVA,额定电压为 6000/230V,50Hz的单相变压器,其铁损为300W,满载时的铜损为80O

Answer 1

变压器的额定电流：I1 = 50 / 6 = 8.33 A I2= 50 / 0.23 = 217.4 A

ZL=0.81+j0.61 Z = (0.81*0.81+0.61*0.61)^0.5 = 1.014 Ω

I2 = 220 / 1.014 = 217 A I1 = I2 * 230 / 6000 = 230*217/6000 = 8.31 A

变压器为满载运行.

输出功率（有功功率）: P2= I2*I2*R2 = 217*217*0.81 = 38142 W

输入功率（有功功率）: P1 = P2+ p铁+P铜 = 38142 +300+800 = 39242 W

效率： A = P2/P1=0.972 = 97.2%