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Posted by Jim Wilkins on May 31, 2008, 7:39 am
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On May 30, 6:06=A0pm, Ignoramus23731 <ignoramus23...@NOSPAM.
23731.invalid> wrote:
>
> What I am afraid, is that out of this 440-220 transformer, I would get
> not 440v, but maybe 420 volts.
> i
http://en.wikipedia.org/wiki/Buck-boost_transformer
Jim Wilkins
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Posted by Martin H. Eastburn on May 31, 2008, 10:27 pm
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So when you put in 240 on the 220 input the losses might be ok.
It depends on the 'regulation' of the transformer - how tightly
the two windings are to each other.
Many transformers have multiple taps on the input and/or output for
line regulation correction...
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/
Ignoramus23731 wrote:
>> Iggy,
>>
>> Transformers are generaly "bi-directional" but work better in the direction
>> they were designed for.
>>
>> I would try and get "full power" out of one backwards but it will work.
>> I've used 110-220 both ways and don "squirly" things with old 70Volt audio
>> transformers.
>
> What I am afraid, is that out of this 440-220 transformer, I would get
> not 440v, but maybe 420 volts.
>
> i
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Posted by Gunner on June 4, 2008, 6:31 am
Please log in for more thread options On Fri, 30 May 2008 17:06:56 -0500, Ignoramus23731
>> Iggy,
>>
>> Transformers are generaly "bi-directional" but work better in the direction
>> they were designed for.
>>
>> I would try and get "full power" out of one backwards but it will work.
>> I've used 110-220 both ways and don "squirly" things with old 70Volt audio
>> transformers.
>
>What I am afraid, is that out of this 440-220 transformer, I would get
>not 440v, but maybe 420 volts.
>
>i
Even if you do..that 20 volts ..in the grand scheme of things..really
wont mean shit at 400+ volts
Gunner
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Posted by dcaster@krl.org on May 31, 2008, 9:53 am
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> Could you explain more on this aspect of "transformers work better one
> way versus the other"?
>
> If one stays within the voltage and ampere ratings, any transformer
> should work either direction.
>
> TMT
Transformers will work both directions. However they are usually
designed to boost the voltage slightly to compensate for the drop in
voltage due to the resistance in the windings. So a 120 to 240 volt
transformer with 120 volts in, might put out 243 volts with no load
and 240 volts when loaded.
Dan
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Posted by Wes on May 30, 2008, 6:07 pm
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>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?
Well I'd want one rated for the voltage I'm using. Then there is KVA
rating. That has to be up to what you are trying to power. Higher power,
to problem. 50 cycle, no problem.
I have never run into a warning that a transformer is only suitable for
going one way.
The only issue I'd be concerned about is using a way bigger transformer than
needed. Hysterisis losses might be high.
Wes
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> What I am afraid, is that out of this 440-220 transformer, I would get
> not 440v, but maybe 420 volts.
> i