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The aux VTs in use are 208/120v step downs and the resulting 120v voltages are then used for relaying and SCADA purposes. I don't know why the station was configured this way, there aren't presently any 208v loads being fed. I find a lot of strange connections like this at very old locations...

Stevenal, can you expand upon that? Intuitively I know that's how this circuit works, because I know 208V is being delivered to the set of aux VTs. Are the two 208 voltages 120 degrees apart? If you call the first voltage VC-neutral, what is the 2nd? Va-(0.5Vbc)?

I am dealing with a three phase, open delta set of station service transformers that was (for whatever reason) set up to deliver 208V potential to a set of open delta auxiliary VTs. The transformers are configured as shown below. One of the open delta auxiliary VTs is fed from phase C to...