Learn, why the substation transformer neutral is connected to the earth? in Hindi in this video tutorial. Earthing of the neutral wire of the distribution transformer explained in this video.
A need for neutral grounding in the power system is required due to the problems of floating neutral in an electrical system. It helps in, 1- Protection of the transformer and other equipment from high voltage due to switching & lightning transients and some faults. 2 - Easier to measure the line voltage for control and indication.
An educational tutorial on electrical engineering 287 in Hindi by G K Agrawal (Gopal Krishna Agrawal) (with industrial product design experience)