Three single-phase transformers are connected in a Y-Δ configuration to form a three-phase transformer bank supplying a 120 kVA, 230 V, 0.85 pf lag load. Calculations show the primary phase current is 17.39 A and since it is a Y connection, the primary line current is also 17.39 A.
Pre Engineered Building Manufacturers Hyderabad.pptx
13.8.2 Example 1
1. Example 1
Three single phase, 50 kVA, 2300/230 V. 50 Hz
transformers are connected to form a three
phase 4000/230 V transformer bank. The three
phase transformer supplies a 3Φ 120 kVA, 230
V, 0.85 pf (lag) load.
2. Y-!
A1
B1
C1
N1
T1 T2 T3
A2
B2
C2
Figure 10.44: Phase wiring for “Y-∆” transformer.