[ARC5] UPS Transformers

[Bill Cromwell]

Thanks Brian,

Now I know how to select a place to set my coffee stein to keep the 
coffee warm <evil grin>. I use oversize parts in my projects anyway so 
it might not really keep my coffee warm but I'll keep that in mind this 
winter. Coffee stein on the big, black hank of iron that is being forced 
to run backward. Check.

73,

Bill  KU8H


On 11/18/2015 09:05 PM, Brian 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.
>