Just had a visit today by a rather sceptical gent, rep of a major French/German maker of all manner of power related equipment.
End result? My description of the existing equipment is accurate, and the idea should work. Quote will follow.
A few matters that were clarified:
1) This is an instance where an 'ordinary' transformer will probably suffice. No real need for a "K" rating, since the lights are not the source of the 'harmonics.' Here it is important to recognize that there's more to 'power quality' than just harmonics; and,
2) Yup, they can make a lot of stuff that's not in the catalog. For example, the transformers I want in an unvented (though still Nema-1) case. That will be enough to keep the rather modest amount of conductive dust at bay.
Of course, now I need to dig deeper into the plant's distribution system. This is going to be an incremental project.
