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.

The rating of Transformer are 11KV, 22KV, 33KV instead of 10KV, 20KV & 30KV?

2 Answers  

What shall be minimum thickness of firewall in between two transformers and which code specifies it ?

1 Answers  

What is the power factor of a transformer at no load?

0 Answers  

We have one Energy meter for Measuring the voltage,current,power,energy(KWH,KVARH,KVAH) & power factor.The problem is that the meter does not show whether the PF is lagging or leading.So i want to know that is there any way or calculation to find out that whether the PF sign (lagging or leading) depending upon the above mentioned parameters?

4 Answers  

What is the winding resistsnce need to be in a 1000kva, 11kv/415v transformer, between ht winding to lt winding, ht winding to earth, lt winding to earth.?

1 Answers   Trident,

What iz main protection of mediuum voltage motors and what iz the standard IR voltage of 6.6 and 11kv motors.

1 Answers   GE,

what is meant by 3rd hormonics ?

0 Answers   VRVS,

why are use star delta startor.

4 Answers  

WHAT IS DIFFERENCE BETWEEN CAPACITOR AND CAPACITANCE?

0 Answers   Manipal Hospital,

Why two phase welding machine is used instead of three phase welding machine.

0 Answers   Merck,

What is Toroid?. What is the difference between toroid and Current Transformer

1 Answers   DAE,

what will be d.g. capacity to cater together for 14hp A.C. load & 3kw lighting load

0 Answers