[ARC5] UPS Transformers

[Rich Post]

I guess I'll have to stop using my back to back UPS transformers as an
isolation transformer solution as I have been doing for a couple of years
despite the fact that they don't seem to be running hot at all.
Brian, could you possibly be running US-made transformers at 50 Hz in Oz?

Rich KB8TAD

On Wed, Nov 18, 2015 at 9:05 PM, Brian <brianclarke01 at optusnet.com.au>
wrote:

> Hello Wayne,
>
> Connecting transformers back-to-back is not a good long term solution. The
> transformer designer calculated how much extra beef the primary needed to
> provide magnetising current for the core. For the transformer in the second
> position, when you use the secondary as the primary, all that magnetising
> effort must come from the secondary, which it was not designed to provide.
> So, the second transformer will overheat.
>
> Still this is wonderful news for American transformer manufacturers.
> Already, in my experience, the accountants have shaved the amount of copper
> and iron very close to the bone; so, American transformers run much hotter
> than ones designed by engineers. And because you will burn out the second
> transformer you will need another = extra sales. Isn't that just wonderful?
>
> 73 de Brian, VK2GCE.
>
> On  Thursday, November 19, 2015 2:07 AM , Wayne said:
>
> That is an interesting idea to take two discarded UPS units transformers
> and hook them LV side back to back to make a isolation transformer.  <snip>
>
> Wayne
> WB5WSV
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>