Usually, working with Y Connection Style is easier than Delta Connection Style, since you can solve the problem on a per-phase basis. As a result, sometimes we may need to transform a -connected impedance load to a Y-connected impedance load.
The transformation of the source follows the voltage and current relationships explained before.
For balanced impedance loads, we have:
This can be derived based on the fact that the Y-connected load and the corresponding -connected load are equivalent circuits.