[ARC5] UPS Transformers

[Brian]

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