Vr = 230/_0 
Vy = 230/_-120 
Vb = 230/_120 

Ir = 30/_-30 
Iy = 30/_-90 
Ib = 30/_120 

Nuetral current = 10.98+j(-19.02) 

The supply voltage of phase R to nuetral = Er = 239.82/_-2.54 volts