That could just be open delta wired wye primary. Actually pretty normal here using 2 transformers. One of the transformers is center tapped on the secondary and off you go.
Yah, I've seen that 2 transformer connection very often. But those transformers are usually connected to a 4 wire wye system with a grounded neutral.
I found a picture of a transformer like I was asking about:
http://www.electricalphotos.com/showphoto.php/photo/425/ppuser/28This picture is very similar to the one I seen in that other book. Could it be a three phase unit or not?
