Calculate the per unit leakage reactance of a 315 KVA, 11000/440 V, 50HZ 3 phase core types transformer with data and delta star connection.

LV Windings: Inner diameter =0.22m, outer diameter =0.26m, area of conductor= 170mm2, length of coil=0.5m voltage per turn 8V, resistivity=0.21Ω/m/mm2 .

HV Winding diameter =0.29m, outside diameter =0.36m, area of a conductor= 5.4mm2