Answer / muthuvel

In Transmission of Electrical Power,There is no need of Single Phase Output.The neutral is required where ever the Single Phase output is required.And If it is Star system means
we are required to give Three phase Four wire It is economically not good.So only Power System Always having Delta System in Transmission and Star System in Distribution This is very small basics of Transmission and Distribution System.

Answer / subbiah

Neutral is not necessary in transmission

Answer / saji

3 Pahse, 3-wire system is more economical than 3Phase - 4
wire system.

Answer / sounderraj k

To save cost, As Delta connection is three wire system
where as Star connection is four wire system. The neutral
point is made by local Earthing at distribution transformer
secondery end

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