Thank you everyone for your insight and comments.
To date we have determined that the shipping anchors were released and the conductors were properly terminated within the transformer housings. Since these measures were verified and the transformer appears to be operating within NEMA...
I have a 75kVA dry type transformer. 480v:120/208v, wye-delta configuration. The transformer is one of two installed as part of a recent project, and is appreciably louder than the other transformer on the project.
When I measure the sound pressure level of the room with the 'noisy'...
