Assume balanced sources (equal, 120° apart), 123 phase sequence and balanced loads.
IL1
a
1
Ia
I1
V1 + 120?20°
4 + j3 ?
Z
ILn
N
V3
n
Z
Z
I3
V2
I2
IL3
b
2
Ic
Ib
IL2
3
Line current $I_{L1}$ = Ex: 123 ? Ex: 45°
Load current $I_a$ = ?
Line voltage $V_{12}$ = ?