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How to Calculate 11 KV Side Cable size of a 250 KVA Oil
cooled transformer
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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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