Answer / mayadhar81

1200 kw = 1200*1000 watt
that means 1200000 watt ok
In single Phase for example 1000 watt load,supply 230
volts,current is watts/volts
answer is 1000/230=4.34 amps ok
in 1200000 watts =4.34*1200=5208 amps ok
Per phase current=5208/3=1736 amp
three phase transformer/ generator=1736/1.392=1247 kva dg
or transformer is used for full load.
Then you have used 1500 kva dg or transformer
and put it 80% load.

Answer / niraj

Answer #1 does not take into account the power factor.

Answer / mahendra

KVA=KW/cosφ
KVA= 1200/.9
KVA=1333KVA @80%
KVA= 1500KVA

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