3.29 Consider three ideal single-phase transformers (with a voltage gain of n) put together

as a delta-wye three-phase bank as shown in Figure 3.33. Assuming positive-sequence

voltages for Van, Vbn, and Ven, find Van', Vb's and en in terms of Van Vbir and Ven

respectively.

(a) Would such relationships hold for the line voltages as well?

(b) Looking into the current relationships, express I, I, and I in terms of I, I, and

Ic, respectively.

FIGURE 3.33

A-Y connection for

Problem 3.29

(c) Let S' and S be the per-pbase complex power output and input, respectively. Find

S' in terms of S.

a o

bo

со

n'

b'