[TZ] Curious about 3 phase power

[Steve Lewis]

No, this isn't inspired by anything stronger than Pepsi J
 
I've been living out of town in a motel for a few weeks, and last week a
horrific thunderstorm passed right over the top of the establishment just
about dusk.  I stood in the doorway enjoying the show, and several times the
lights flickered.  I happened to notice that half the exterior lights on the
building facing me didn't come back on while my room lights came back on
just fine.
 
It wasn't long before the heat and humidity caused me to notice that the air
conditioner wasn't running.  Upon inspection, the control panel was on and
displaying "br" and a light on what appears to be a GFI at the plug was on.
It hadn't tripped.  Weird.
 
The motel is fed 3 phase to one or more large transformers on the property.
Each building is apparently fed 240 (120/120) and by luck, rooms are on
allocated somewhat randomly about the two halves of the 240, and long
strings of outside lights fed off one side or the other.
 
Sure that the motel was fed 3 phase, and nothing on the property required 3
phase, I hypothesized that one of the three legs of the primary was out.  I
couldn't really wire the big distribution transformer in my head to supply
power to the several buildings in such a way as to have lost a leg of the 3
phase going in, and coming out as 240 (120/120) dropping one side of the of
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.
 
The next day, when nothing had been repaired, I took a look at the three
fused cutouts feeding my motel and a couple of others, and sure as heck the
fuse had been expelled and the cutout was hanging open.  Since I saw no
damage to the primary on the poles that feed these various motels, I came to
the conclusion that when the lights blinked the several times then turned
back on, there was severe inrush current trying to restart air conditioners
which blew the fuse on the pole.
 
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?