In most of the 3-ph systems neutral is provided just to take care of the unbalanced current. Unbalanced current are nothing but when any of the phase is slightly overloaded or in case of phase failure, balanced currents will produced and neutral will carry these currents safely to earth without disturbing the other phases and other connected equipment to the distribution board neutral is generally provided and all the neutrals of the db's (Distribution boards) are interconnected and at the transformer this neutral will solidly grounded.
During any disturbances ,ie: during short circuit condition neutral is used to ground the surge flowing through the lines.
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