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Join Date: Jul 2012
Posts: 14

Single phase output transformers in parallel

07/28/2012 5:10 AM

Is it possible to parallel the ouput of two identical 415/110v 10kva transformers, when one transformer secondary is floating and the other is centre tap earthed?
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TonyS
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#1

Re: Single phase output transformers in parallel

07/28/2012 7:51 AM

In short, yes.

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Mushtaq Hussainh
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#2

Re: Single phase output transformers in parallel

07/28/2012 7:31 PM

Please give us some more details for small 10KVA capacity transformers required to connect in parallel. Can you not use them independently. Paralleling of transformers are required some conditions to meet.

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Haajee
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#3

Re: Single phase output transformers in parallel

07/29/2012 6:24 AM

Yes.

But keep in mind that out-put be in phase i.e. polarities of the transformers are same.

and must be identical, and even then, there will be differences that cause a difference in load sharing.
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marcot
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#4
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Re: Single phase output transformers in parallel

07/29/2012 8:18 AM

GA hajee.

One detail is not 100% true though. The transformers don't need to be completely identical. They must have almost the same open circuit and phase voltage to avoid / minimize the circulating current. Their respective impedance will define how well they will share the load. If their impedances are different, one transformer will overload before the other (for the same KVA). You will not reach the full power for both at the same time.

OP: Simply measure the secondary current of each transformer at no load (should be less than 1%), 50% load, and higher load until you reach a limit.

You should also place protection fuses at each secondary. Size the fuse to protect each transformer.

Do not expect to reach full power. De-rate the assembly by at least 20% just in case.

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Haajee
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#6
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Re: Single phase output transformers in parallel

07/31/2012 5:40 AM

THanks for more details.
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rishikathirasan
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#5

Re: Single phase output transformers in parallel

07/29/2012 10:00 PM

Transformers can be paralleled but centre tap transformer should not change its impedance while operation if needed it can be controlled by its primary kathirasan engineer electrical mtce
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