Answer Posted / sachin

actually at the time of transformer rating decided the
following factor to be consider
1.Connected Load
2.Power fACTOR
3.fUTURE eXPANSION

KW=KVA*P.f
630=KVA * 0.8
KVA = 630/0.8
KVA = 787.5 KVA

So the Transformer size is 800KVA

THIS CALCULATION IS EXACTLY CORRECT

BUT FOR FUTURE EXPANTION WE CONSIDER 30 % MARGINE FOR THAT

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