Cable impedance= (0.037+j0.0115) pu

Equivalent star impedance of 6.6kV winding of the transformer =(0.02+j0.12) pu

Per unit transformer impedance,Zt=(0.0046+j0.031) pu

Total series impedance=(0.046+j0.073) pu

Sending end Voltage =|Vs|=6.56kV (line-to-line)