delta to wye (balanced three phase source)

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http://forum.allaboutcircuits.com – hi there,, I am new to this forum and to this topic as well... First, I have a delta connection with sources in each "leg". Each source has a series impedance with it...and I am asked to transform this into wye equivalent.. So here's what I know (based from my knowledge)...The ones given in the problem are the impedances and the voltages of the voltage sources.. Since the lines a, b and c aren't connected to anything (from the problem. Vab, Vbc and Vca are just open circuit voltages), I can do a kvl around the triangular loop.. From there, it can be seen that Iab, Ibc, and Ica (Embedded)