Transformer damage

[gmullis195]

What would be the expected effect on a wye grounded - wye ungrounded transformer if two of the high side bushings were connected to one phase, (example: H1 and H2 connected to Phase A and H3 connected to phase B). Would this be expected to cause ferroresonance as could be expected if the units were single phased? The units in question are 5-leg designs with silicon steel cores feed by 500 feet of underground cable. The units were connected this way for 2+ hours and overheated.