Answer Posted / ramesh patel

Hi,
1. The distribution transformer is meant for 3phase 4wire
system and is for utilities where the fourth wire i.e
neutral is required by users for protection and control of
the switch-gears and power network.
2. Primary delta and secondary star connection prevent the
source side harmonics to impact the secondary side utilities.
3.No need to carry neutral wire of the 400VAC system to the
transformer, if primary is delta connected bcz only three
wire solve the purpose in delta /Star and neutral wire
easily connected to star point of secondary.

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