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two transformer using the same core 1

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martinrelayer

Electrical
Oct 26, 2007
68
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!!
 
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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 -
 
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!!
 
Isn't the primary winding common to both of the secondary windings?
 
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.
 
have you ever seen anyhing like that??
Connection is Yd11-Dd0
 
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.
 
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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