Answer Posted / prabhu gnanasekaran

In a distribution sector your fault current sector should
be immedietly earthed in order to sequre the equipment
getting damage. So the nearest path will be provided
through out the plant.
Transformer neutral is grounded because your transformer
will be the impotant electrical equipment and this has to
be protected for fault i cannot have a neutral floating and
it has to be earthed properly. It is also earthed in order
to reduce the 3rd Harmonics effect.

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