220-440v transformer

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Subject Author Date
220-440v transformer Ignoramus23731 05-30-2008
Posted by Larry Jaques on May 31, 2008, 5:48 am
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 On Sat, 31 May 2008 03:50:54 GMT, with neither quill nor qualm,

>
>"Ignoramus23731"
>message >
>> Just one phase.
>>
>Just curious---what the heck runs on 440 single
>phase?

VERY fast motors, well, for a couple seconds, anyway. ;)

--

To change one's self is sufficient. It's the idiots who want to change
the world who are causing all the trouble --Anonymous

Posted by Joseph Gwinn on May 31, 2008, 5:25 pm
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 wrote:

> "Ignoramus23731"
> message >
> > Just one phase.
> >
> Just curious---what the heck runs on 440 single
> phase?

A 440 volt VFD that then powers a 440 v 3 phase motor?

Many or most 3-phase input VFDs can be wired for single-phase input, at
some expense in derating.

Joe Gwinn

Posted by Bruce L. Bergman on June 1, 2008, 1:37 am
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>"Ignoramus23731" wrote in message

>> Just one phase.
>
>Just curious---what the heck runs on 440 single
>phase?

Not a whole lot - But if you have 277V/480V 3-Phase 4-Wire Wye
service there's a LOT that runs off a single 277V leg to Neutral.
Overhead fluorescent and HID lighting, Emergency and EXIT lights,
parking lot HID pole lights, and a lot more.

You can cover a 5,000 foot warehouse with two or three circuits of
high-bay lighting at 277V or 10 circuits at 120V. Makes it go
together a lot faster and easier, and a lot less wire.

--<< Bruce >>--


Posted by Dave August on May 30, 2008, 6:15 pm
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Unless there is some serious Hysterisis loss, you'll get the 2-1 the
transformer is wound for.

Hook it up and see.

--.- Dave

>> 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



Posted by Wes on May 30, 2008, 6:20 pm
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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 think 10 percent variation is normal. Some transformers have voltage
adjustment taps. I personally prefer a bit high over a bit low.

Wes

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