Answer Posted / a.narasimha rao

Transformer capacity is 250 KVA

Primary current = 250000/1.732x11000= 13.12 Amps

Short circuit current ( 6 times primary current )

total current would comes -----90 amps

Size of the cable --- 3c X 35/ 50 sq.mm 11 kv HT XLPE
cable is required for primary

Secondary side current -----333.35 amps

cable size is 3.5 c X 300 sq.mm AYFY cable is required

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