What is the result when 3 kva power requirement is being supplied by 250 kva transformer?
The result is that the transformer runs cool and contented.
The '250 KVA' rating on the transformer is its maximum ability
to
transfer power from its input to its output without
overheating,
NOT an amount of power always running through it.
If the 3 KVA load happens to be the only thing connected to
the
transformer at the time, then only 3 KVA flows into the
transformer
from the primary line, and only 3 KVA leaves the transformer
secondary.