Question

2) Draw the equivalent circuit of Figure 3 based on the equivalent circuit in Fig. 2 showing all the appropriate impedances in per unit.

Note: Since the transformer model has two windings on the secondary side, you can combine the impedances of the two windings to make a single equivalent winding on the secondary side. In other words, the secondary winding voltage is considered to be 240V and the impedances R2 and X2 are the combined impedances of the two windings on the secondary side

Given a circuit with a three-winding transformer and three loads in Fig. 3. This is a typical distribution transformer which delivers power to your family homes. The 240-V secondary winding is center-tapped and the center neutral wire is grounded, making the two end conductors "hot" with respect to the center tap. A 120-V load, such as Load 2, is connected between a hot wire and the center neutral wire. A 240-V load, such as Load 3, is connected between two hot wires L1 Meas Loed t 120 V 20 W 10 k PO PO V1 Meas VL3 Meas Load3 240 V 30 WW 29kVa Il meas VL.3 14400 V VL 2 Meas VL2 5kVA 4 400-120-120 V L2 Meas Load 2 20 W 10 ka Fig. 3 Three-winding distribution transformer under load

Answer 1

taking+6.ey-F5KVA aa ba e İmfe do 4400v 10. 440 o 2 44002 0.904 T주주00 44002 Mu L:3 2. 22.36 .KvA 乙=

240 197 2_O 30 $932.6 144802