A three phase $50$ Hz transformer has a delta$-$wye connection, the line voltage is $22$ kV on primary side $400$ V on the secondary side. The line current on the primary side is $5$ A$.$ Base values at load: $100$kVA, $400$V

Determine a$)$ Base current on the secondary side

b$)$ Load current IA IB IC with VA as reference

c$)$ Turn ratio

d$)$ current with magnitude and phase in each coil the primary