Answer:
We are to find bar Zy and bar X in this question
We have Va = 480v
IL = 15L-25⁰
When we connect Y we have
Iph = IL = 15L-25⁰
Vph = VL/√3
= 489/√3
= 277.128V
Bar Zy = Vph/Iph = 277.128/15L-25⁰
= 18.475L25⁰
For bar Z
15L-25⁰/√3
= 8.6L-25⁰
VL = 480v
480/8.6L-25⁰
= 55.14L25⁰
Please check attachment.
