A balanced three-phase -connected source is shown in Fig. P11.21. a) Find the Y-connect...

A balanced three-phase -connected source is shown in Fig. P11.21.

a) Find the Y-connected equivalent circuit.

b) Show that the Y-connected equivalent circuit delivers the same open-circuit voltage as the original -connected source.

c) Apply an external short circuit to the terminals A, B, and C. Use the -connected source to find the three line currents I_aA, I_bB, and I_cC.

d) Repeat (c) but use the Y-equivalent source to find the three line currents.