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two transformer using the same core

two transformer using the same core

two transformer using the same core

(OP)
Hi all,

In our mill there's 2 transformer in the same tank for electrolysis thyristor rectifier (12 pulses) that uses the same 3 legged core.
Does anyone know any advantage/disadvantage about this design (apart from the cost-saving benefit)?
Any info/paper?

thanks!!

RE: two transformer using the same core

The more the pulses the less the ripple.  Ripple is bad.

You understand this aspect correct?

Otherwise your question is not clear enough to me, perhaps others?

Keith Cress
kcress - http://www.flaminsystems.com

RE: two transformer using the same core

(OP)
Hi!

My question is regarding the transformer's design, I mean, two different transformers, with their coils using the same core, one winding group (HV and LV) above the other, in the same leg, per phase. 3 leg core.

sory about my english!

thanks!!

RE: two transformer using the same core

Isn't the primary winding common to both of the secondary windings?   

RE: two transformer using the same core

(OP)
no, two different trafos.

RE: two transformer using the same core

Well, if they are wound on the same core, that is one transformer, however you slice it.  Flux is flux and it will induce voltage in all the windings regardless of where it came from.  If a load is put on one of the secondary winding, I believe it will cause current to flow in both primary windings, if both are energized.  

Normally, on a twelve-pulse drive, this is a three-winding transformer with one secondary wound delta and the other wound wye.   

RE: two transformer using the same core

(OP)
have you ever seen anyhing like that??
Connection is Yd11-Dd0

RE: two transformer using the same core

No, but as long as both primary windings are identical and are external energized, I don't think it is going to behave too much differently than a three-winding transformer.   

RE: two transformer using the same core

I think that it may be a dual voltage transformer with two identical primary windings. The windings would be in series for the higher voltage and in parallel for the lower voltage. This may look like two transformers but it isn't.

Bill
--------------------
"Why not the best?"
Jimmy Carter

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