Chapter 3, Problem 3.33P

Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in $\Delta$, place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a’, b’, and c’ such that $V_{AN}$ is $90°$ out of phase with $V_{a\text{'}\eta }$ for positive sequence.