Answer / engr.abdurrahim

As your Question, I think in your transformer is having
interturn fault or single phasing or may be LG
fault.Without load if any fuse blown means connected things
(Transformer)itself having problem.

Solution:
Do the Meggaring and check insulation between, phases at HV
side,LV side,
Check insulation between phase to neutral, Phase to earth.
Check Earth resistance also.

Answer / pillay

It could be just high inrush current,
incorrect fuse size or a defective fuse
in the first place.If it recurs than
further investigations should be taken.

Answer / niranjan

Due to high inrush of current or there may an inter turn
fault on ther primary side of the transformer

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