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Posted by Ignoramus8495 on April 20, 2006, 4:52 pm
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I have a three phase transformer, with which I want to do something
interesting to me. It is shaped like a letter E, with three separate
transformers, one on each leg.
Its output is essentially six leads, two from each leg.
Let's say that they are
A1 B1 C1
A2 B2 C2
A, B and C are three transformers on separate legs of 3 phase
(separate horizontal pieces of letter E).
I want to feed this into a "three phase rectifier", which takes just
three incoming wires.
I think that I have to tie together A1 to B2 => X, B1 to C2 => Y, and
C1 to A2 => Z.
Tie points X, Y and Z is what is fed into a 3 phase rectifier.
Is that correct?
i
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Posted by Don Foreman on April 20, 2006, 5:04 pm
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On Thu, 20 Apr 2006 20:52:14 GMT, Ignoramus8495
>I have a three phase transformer, with which I want to do something
>interesting to me. It is shaped like a letter E, with three separate
>transformers, one on each leg.
>
>Its output is essentially six leads, two from each leg.
>
>Let's say that they are
>
>A1 B1 C1
>
>A2 B2 C2
>
>A, B and C are three transformers on separate legs of 3 phase
>(separate horizontal pieces of letter E).
>
>I want to feed this into a "three phase rectifier", which takes just
>three incoming wires.
>
>I think that I have to tie together A1 to B2 => X, B1 to C2 => Y, and
>C1 to A2 => Z.
>
>Tie points X, Y and Z is what is fed into a 3 phase rectifier.
>
>Is that correct?
>
>i
Unless there is another set of 3 windings, this is not a 3-phase
transformer.
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Posted by Ignoramus8495 on April 20, 2006, 6:28 pm
Please log in for more thread options wrote:
> On Thu, 20 Apr 2006 20:52:14 GMT, Ignoramus8495
>
>>I have a three phase transformer, with which I want to do something
>>interesting to me. It is shaped like a letter E, with three separate
>>transformers, one on each leg.
>>
>>Its output is essentially six leads, two from each leg.
>>
>>Let's say that they are
>>
>>A1 B1 C1
>>
>>A2 B2 C2
>>
>>A, B and C are three transformers on separate legs of 3 phase
>>(separate horizontal pieces of letter E).
>>
>>I want to feed this into a "three phase rectifier", which takes just
>>three incoming wires.
>>
>>I think that I have to tie together A1 to B2 => X, B1 to C2 => Y, and
>>C1 to A2 => Z.
>>
>>Tie points X, Y and Z is what is fed into a 3 phase rectifier.
>>
>>Is that correct?
>>
>>i
>
> Unless there is another set of 3 windings, this is not a 3-phase
> transformer.
In fact, yes, each of these secondary sets is in fact two
windings. They are parallel.
If I call them Atop and Abottom, Btop and Bbottom, Ctop and Cbottom,
there are six leads coming out of the secondaries.
I can draw a picture on paper.
i
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Posted by Ignoramus8495 on April 20, 2006, 6:40 pm
Please log in for more thread options Don, here's the schematic of this transformer:
http://igor.chudov.com/tmp/xfmr.jpg
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Posted by Don Foreman on April 20, 2006, 10:50 pm
Please log in for more thread options On Thu, 20 Apr 2006 22:40:30 GMT, Ignoramus8495
>Don, here's the schematic of this transformer:
>
>http://igor.chudov.com/tmp/xfmr.jpg
OK. You can probably assume that the windings are all polarized the
same, with "start" on the left and "finish" on the right.
There are still many ways to connect it, including
primary delta, secondary delta
primary delta, secondary wye
primary wye, secondary delta
primary wye, secondary wye
several variants using each winding as an autotransformer for that
phase
etc
The choice will determine the transformation ratio and therefore the
output voltage and current capability.
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>interesting to me. It is shaped like a letter E, with three separate
>transformers, one on each leg.
>
>Its output is essentially six leads, two from each leg.
>
>Let's say that they are
>
>A1 B1 C1
>
>A2 B2 C2
>
>A, B and C are three transformers on separate legs of 3 phase
>(separate horizontal pieces of letter E).
>
>I want to feed this into a "three phase rectifier", which takes just
>three incoming wires.
>
>I think that I have to tie together A1 to B2 => X, B1 to C2 => Y, and
>C1 to A2 => Z.
>
>Tie points X, Y and Z is what is fed into a 3 phase rectifier.
>
>Is that correct?
>
>i