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On paper, paralleling transformers= looks easy.
Same voltage. Same rating.
Close the bus coupler.
But= many sites learn the hard way.
Because transformer paralleling is not a= bout ratings alone.
Three conditions decide success.
First.

 
 
 =

V= ector group and winding configuration
Both transformers must have the sa= me vector group.
Delta=E2=80=93star cannot run in parallel with star=E2= =80=93star.
Phase displacement mismatch creates circulating currents.Protection may not even detect it early.
Second.

 
 
=

Voltage ratio
Even a small voltage mismatch causes reactive power circulation.
One transformer starts pushing VARs into the other.
Loading becomes unequal.
Losses rise.
Power factor drops.
This is silent damage.
Third.

 
 = ;
 = ;
 

Impedance
Impedance decides load shari= ng.
Lower impedance transformer takes more load.
Higher impedance tra= nsformer stays underutilised.
End result.

One transformer = overheats early.
The other looks healthy.
Operators blame loading.Root cause stays hidden.
Now comes the real shock.
Short circuit cur= rent.

 
 
 

Whe= n you parallel transformers, fault current increases sharply.
Your 11 kV= switchgear may suddenly see double the fault level.

That is why man= y plants shift to alternatives.
=E2=80=A2 High Speed Bus Transfer
=E2= =80=A2 Normally open bus couplers
=E2=80=A2 Current limiting solutionsNot because paralleling is wrong.
Because paralleling without full stu= dies is dangerous.

Engineering is not about what is possible.
It = is about what is safe to operate for 20 years.
If you design substations= , this clarity matters.

 
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<= table cellpadding=3D"0" cellspacing=3D"0" border=3D"0" width=3D"100%" class= =3D"spacer" style=3D"width: 100%;">
 

want to learn this in depth Join with me for a free we= binar click here

Register Now=
 
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PowerProjects, 4= /499, Vinobha Nagar, Koduvai, Tirupur 638660, Tirupur, Tamilnadu, India, 63= 8660

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