We energized two identical 345 kV/34,500V transformers in Kansas. About 26 hours later, oil temps between the two transformers were 10C and winding temperatures were 15C (59F difference). This is not normal under these conditions. We are waiting to see what the manufacturer says. (Sorry about the wind, its a wind farm)

1:09 i accidentally said the low side switch was closed, I meant to say open.

The answer and remaining video will be in part 2 (as of this moment, there is not a part 2 filmed)