220-440v transformer

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Subject Author Date
220-440v transformer Ignoramus23731 05-30-2008
Posted by Ignoramus23731 on May 30, 2008, 7:05 pm
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> 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.
>>
>
>
> Should be easy enough to check.
> You also ought to be able to change the taps around to get plus or minus
> five percent or so on the output.
> I'm assuming a three phase IO here.
>

Just one phase.

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Posted by BillM on May 30, 2008, 11:50 pm
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"Ignoramus23731"
message >
> Just one phase.
>
Just curious---what the heck runs on 440 single
phase?



Posted by Ignoramus23731 on May 31, 2008, 1:15 am
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>
> "Ignoramus23731"
> message >
>> Just one phase.
>>
> Just curious---what the heck runs on 440 single
> phase?

An old Hypertherm 600 plasma cutter.

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to spammers, I and many others block all articles originating
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Posted by Pete C. on May 31, 2008, 9:32 am
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Ignoramus23731 wrote:
>
> >
> > "Ignoramus23731"
> > message >
> >> Just one phase.
> >>
> > Just curious---what the heck runs on 440 single
> > phase?
>
> An old Hypertherm 600 plasma cutter.

Also useful for testing 440V VFDs presuming you have a 3 phase motor
that can be strapped for 440V to go on the output of the VFD.

Posted by Joseph Gwinn on May 31, 2008, 5:28 pm
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> >
> > "Ignoramus23731"
> > message >
> >> Just one phase.
> >>
> > Just curious---what the heck runs on 440 single
> > phase?
>
> An old Hypertherm 600 plasma cutter.

If memory serves, at 440 one cannot use any direct action switches, and
must instead use contactors in well-grounded metal boxes to turn things
on and off.

Joe Gwinn

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