Re: Reversing a Power Transformer ---> NOT!

[BEAR]

This post is NOT just about *reversing* a power transformer,
but rather running a winding at OTHER THAN THE RATED
VOLTAGE!! In this case as a step UP.

It is quite common to take a 120-->240 xfmr and "reverse" it
by making one side or the other the "primary" and the other the
"load" as long as they both "look" at the original voltages.

And, it's likely that running a *higher voltage rated* transformer
*below* its rated voltages and reversed will work out ok too...
as a step down...

Take the 240v secondary and use it as a primary at 120v to drop the secondary
to 60v...

ymmv :- )

_-_-bear

Casino wrote:

> Hi All,
>
> I have a step-down power transformer with a 120-volt primary and
> 60-volt center tapped (30-0-30) secondary. I was wondering if I could
> reverse the transformer by plugging-in the 60-volt secondary into the
> AC outlet and use it as a step-up for 240-volts? Theoretically, it is
> possible, but I'm not sure if it's actually safe to do so.
>
> Also, when I travel Europe, can the 120-volt primary be plugged into
> 240-volts to supply the 120 (117) for North American appliances.
> Thanks,
>
> C.W.

[Rich Sherman]

You need to know the current capacity on each side as your 'reversing' may
end-up exceeding the original current capacity for the particular section.

"BEAR @rpi.edu>" <"Bradlr2(<removeme> wrote in message
...
>
>
> This post is NOT just about *reversing* a power transformer,
> but rather running a winding at OTHER THAN THE RATED
> VOLTAGE!! In this case as a step UP.
>
> It is quite common to take a 120-->240 xfmr and "reverse" it
> by making one side or the other the "primary" and the other the
> "load" as long as they both "look" at the original voltages.
>
> And, it's likely that running a *higher voltage rated* transformer
> *below* its rated voltages and reversed will work out ok too...
> as a step down...
>
> Take the 240v secondary and use it as a primary at 120v to drop the
secondary
> to 60v...
>
> ymmv :- )
>
> _-_-bear
>
> Casino wrote:
>
> > Hi All,
> >
> > I have a step-down power transformer with a 120-volt primary and
> > 60-volt center tapped (30-0-30) secondary. I was wondering if I could
> > reverse the transformer by plugging-in the 60-volt secondary into the
> > AC outlet and use it as a step-up for 240-volts? Theoretically, it is
> > possible, but I'm not sure if it's actually safe to do so.
> >
> > Also, when I travel Europe, can the 120-volt primary be plugged into
> > 240-volts to supply the 120 (117) for North American appliances.
> > Thanks,
> >
> > C.W.