Answer / serwox

Reasons are as follows:
Efficiency of one 3 phase transformer is slightly higher
than the overall efficiency of three single phase transformers.

Space and weight is greater for the 3 single phase tx than 1
single 3 phase tx hence cheaper to transport a 3 phase tx.

Answer / manthesh

we can surely use three 1-phase transformer but it cost more
than the single 3-phase transformer and maintenance cost is
high for three 1-phase transformers

Answer / s.p.arya

For the same rating we mostly using single 3-phase x-mer instead of the three 1-phase x-mer becoz 1. low floor space required for their installation 2.light weighted 3.cost is 15% less 4.maintenance & handling is suitable compair than three 1-phase x-mers

Answer / michael

We use 3 single phase transformer connected in DELTA instead of 1 single phase transformer because of:
1. space consumption
2. higher cost
3. for example 1 transformer in 3 single phase connected in delta fails to operate, still there is 2 transformer running open delta and still there is a supply in other line, rather than if 1 single phase transformer fails.

Answer / pragati

As compared to a bank of single phase transformers,the main
advantages of a 3 phase transformer is that it occupies less
floor space, less weight,cost is less for about 15% and the
only unit is to be handled and connected.we can save iron.
saving in iron is due to the joint use of magnetic paths
between the coils.

Answer / debashis das

Any where(motor,dianamo etc) using 3phase instead of 1
phase icrease the efficiency of convertion and also cost
saving.

Answer / ramkumar

one Three phase transformer will occupy less space compare
to 1 phase transformer and also maintenence is much high.

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