its actually wrong to connect it to ground.
in our home there is a separate ground point which is dug into the earth,
same with all poles, a stay wire is connected to a ground sunk into the earth.
same thing we do on our drilling rig when wiring up our gensets, a copper plate is placed in a 3-4 feet deep hole, with calcium, carbon powder on top, and it then watered till it reaches a specified resistance. the neutral is always separate. such earth points are then scattered across the site. all our containers, and metallic structures are connected together with copper cable which is connected to the earth plate.
neutral wire is one end of the coil of the transformer, the other end is the phase wire. in a three phase transformer, all the coils neutral are connected together, and the phase wires are kept separate, hence the 3 phase, 1 neutral.
the ground wire is always kept separate and never is part of the grid. its only for safety purposes.