[TZ] Curious about 3 phase power

[Wayne Woollard]

We may also be seeing the evidence of an "Open Delta" situation with no load
being placed across the transformer derived "Wild Leg" which is an
unregulated voltage in excess of the voltage of the other two legs.  This is
not true 120 degree phase related three phase.
Wayne

-----Original Message-----

Trivial. Large establishments typically make their own single-phase power
from so-called dry-type transformers with a 440-480 volt primary and
120-0-120 and/or 240-0-240 secondary windings. There may be several such
transformers perhaps one for each phase. Some of the Hotel got its power
from the phase that was off. 

Cheers,
Richard B. Johnson
Book: http://www.AbominableFirebug.com/

----- Original Message -----
From: "Steve Lewis" <steve at theengineeringbureau.com>
 

the 240 which allowed lights to be on in some rooms and outdoor lights in
some areas to work but the (I assume) 240 volt AC units not to function.
 
I post this because I'm wondering how a 3 phase transformer would have to be
wired to essentially feed the two halves of the 240 from more than a single
phase.  Any thoughts on this.