Answer Posted / kalinath

as we all know that the distibution transformer has an
different loads on each phase even though we are try to
balance them there is no such an ideal case that each
transformer is ideally loaded....
in this scenario as the output of the transformer is star
connected there is a possibility to have a nutral current
in it if we not connect it to the ground then there is a
possibility to flow reverse current in the neutral which is
a very much problem...

i think this is the reason.....

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