Back- feeding a step down transformer

[PrecisionmachinisT]

I thought I would share this in case there's anyone who might want to back-feed a step-down transformer off of a 220 rotary converter or other low voltage source in order to obtain 460/3 even though the topic was covered a while back; IMO the paper is concisely written, and in terms that are likely more easily understandable by most laymen.

http://www.geindustrial.com/publibrary/checkout/Transformer2?TNR=White%20Papers|Transformer2|generic

[Paul Drahn]

On 5/9/2013 1:38 PM, PrecisionmachinisT wrote:
> I thought I would share this in case there's anyone who might want to back-feed a step-down transformer off of a 220 rotary converter or other low voltage source in order to obtain 460/3 even though the topic was covered a while back; IMO the paper is concisely written, and in terms that are likely more easily understandable by most laymen.
>
> http://www.geindustrial.com/publibrary/checkout/Transformer2?TNR=White%20Papers|Transformer2|generic

MY computer tells me this is an old, out of date, URL and I need to look
in an index to find it or another like it.
Paul

[Pete C.]

No issues with the link here. If you want grab it from my server:
http://wpnet.us/Transformer2.pdf

[James Waldby]

I had the same problem (using Pan). In a newsgroup, URLs
should be enclosed in <, >, as below, which is supposed to
work even if lines wrap. Try the following link:

<http://www.geindustrial.com/publibrary/checkout/Transformer2?TNR=White%20Papers|Transformer2|generic>

--
jiw

[James Waldby]

However, Pan fails with that link also. So please ignore
previous message and this one too.

--
jiw

[DoN. Nichols]

On 2013-05-09, Paul Drahn <pdr...@webformixair.com> wrote:

>> http://www.geindustrial.com/publibrary/checkout/Transformer2?TNR=White%20Papers|Transformer2|generic

> MY computer tells me this is an old, out of date, URL and I need to look
> in an index to find it or another like it.

It works fine for me. No problem at all. Maybe you were
checking it when it was down for backups or something of the sort.

Good luck,
DoN.

--
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Email: <BPdnic...@d-and-d.com> | Voice (all times): (703) 938-4564
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[Karl Townsend]

>
>No issues with the link here. If you want grab it from my server:
>http://wpnet.us/Transformer2.pdf

Thanks for that. I've been running a step up on my three phase 440
volt plasma cutter for some time. I'm just about positive the incoming
nuetral is tied to ground. This .pdf says not too. Its run this way a
long time, no magic smoke so far.

Karl

[PrecisionmachinisT]

"Karl Townsend" <karltown...@embarqmail.com> wrote in message
news:ukaoo8dct9dv14gsk...@4ax.com...

Karl, they are referring to the X0 terminal which is the center point of the
wye winding...

--IF the transformer is being used to step up the voltage and the input
windings are of the wye configuration, then there should be nothing at all
connected to the terminal X0.

SEE:

http://www.federalpacific.com/university/T-Basics/Charts/section-3-scan-4.gif

[Paul Drahn]

Thanks, Pete.
Their example is exactly what we have to power our big convection oven.
We have only 208/3 coming from the main distribution transformer for our
part of the building. Three 200 amp meters. The reverse wired
transformer and oven give us 480 volts, and are the only devices on one
meter. When originally installed, we used to switch off the transformer
with a breaker. But most times when turned on, the meter fuses blew.
Electrical contractor who installed it all replaced the fuses a couple
of times, then recommended we just leave the whole thing on all the
time. We can turn off the oven, but not the transformer.

Now I know why the fuses would blow, more often, than not.

Thanks for the link.

Paul