Steve,
Is it anything like the 2 phase schematics I have posted???
I think Don has hit on this one, where one Primary feeder is a grounded conductor and it's also common to the secondary. Kind of strange, but I have seen such Animals in Las Vegas and Oregon.
A 3 phase transformer bank was fed [primaries] with only two conductors that were suspended by Insulators. These two were on the "ends" of the open delta. In the "middle" [the paralleled connections], a bare conductor [which was run like the ground bonding conductors found on top of Steel Towers for long distance power distribution] made connection to the "middle" of the primary delta AND was bonded to ground at the pole, plus to the secondary's grounded conductor.
Though I was seeing things, so after having a long look [plus a few others to verify it existed], that was the setup!
It has benifits! It just looks really odd!
Scott SET
