Exact !! But for me it was obvious

Well...not completely exact :

What counts is the magnetic flux seen by the 2 windings ; Since they may
not be at the very same place is might not imply the same number of turns.

Generally, these winding are executed (manually or automatically) by the
"2-wire in hand" method.


Phil Allison a écrit :
Look165 wrote:


Just unlink the two winding by cutting at the middle point which is the
common one (it makes 4 separate windins).


** OK - so 240 & 240 plus 120 & 120.


Then put them in parallel at primary and secondary (and in phase !).



** Nah, that makes a 240 to 120 step down.

But only if the parallel pairs of windings have the *exact* same number of turns.

If not, you get major overheating.



.... Phil