Answer / azhar ali

When voltage is stepped up its current reduces and loss of voltage due to transmission is reduced and delta is used for transmission to save one wire.

Answer / gunasekaran

basically generator are star connected with neutral earthing
but GT are delta connected because one voltage level one earthing should be permissible it should be at source end if it is more than one earthing third harmonics getting closed path it will destroyed the normal wave form.for transmission transformer is source end so it is earthed.

Answer / gulshan goyal

if any harmonic has been generated then i should not be go
outside for transmission thats whhy we use generation in
delta because in delta harmoics induced enf creates the
circulating current.For transmission we needed 1.higher
voltage which can be achieved 1.732 times by just having
delta to star 2.in star connection we have star point which
can be used for protection by adding earth relay to that point.

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