220-440v transformer

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Subject Author Date
220-440v transformer Ignoramus23731 05-30-2008
Posted by Lew Hartswick on May 30, 2008, 6:32 pm
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 Ignoramus23731 wrote:
> I would like to know what sorts of transformers are suitable for
> converting 220v to 440v. Specifically, can I use a step down
> transformer in the opposite direction, or will it not work at all due
> to losses, etc?
>
> My actual line voltage usually is 240-245 volts.
>
Sure they will work backwards but the flux leakage will be a tad
higher so derate a little 15 or 20 % .
...lew...

Posted by Wes on May 31, 2008, 7:04 pm
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>Sure they will work backwards but the flux leakage will be a tad
>higher so derate a little 15 or 20 % .

Do you have a reference to that? Always interested in learning something.

Wes

Posted by Martin H. Eastburn on May 31, 2008, 10:40 pm
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Wes -

Think of transforms - they can be designed in many configurations.

Some have loose windings and others have tight coupling between them.

They can be in I, H, 8 or other configurations. I have seen single phase
in complex modes that have internal boost/bucking windings to add or subtract.

If a winding is wound over another, the outer winding will have less magnetic
field than the one on the metal itself.

I have a set of 6 transforms in my shop. I step up and boost the three phases
I generate from a rotary 220 unit. My transformers are over sized from what
I did as I over engineered it for two machines running full bore.
I use one not two. And I run 1 or 2 motors not 3 on that one.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Wes wrote:
>
>> Sure they will work backwards but the flux leakage will be a tad
>> higher so derate a little 15 or 20 % .
>
> Do you have a reference to that? Always interested in learning something.
>
> Wes


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Posted by Lew Hartswick on May 31, 2008, 10:51 pm
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Wes wrote:

>
>>Sure they will work backwards but the flux leakage will be a tad
>>higher so derate a little 15 or 20 % .
>
> Do you have a reference to that? Always interested in learning something.
>
> Wes
The primaries are wound next tothe core with secondaries on top
so reversing the windings will do that.
We are talking about E I laminated cores.
...lew...

Posted by Wes on June 1, 2008, 4:17 pm
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>The primaries are wound next tothe core with secondaries on top
>so reversing the windings will do that.
>We are talking about E I laminated cores.
> ...lew...

Ah, I seem to remember that the primary on my Sansui 8080db receiver was the
first winding. Sure didn't care for having to rewind the darn thing, damn
idiot they moved into my room in the barracks saw a stereo that was
unplugged and just had to plug it in. Power transistors were out due to
failure and the leads to them were loose. D*ckhead managed to fry the
transformer.

Not sure where the First Sergeant transferred this jerk to, hope it sucked.

Wes


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