I work for a large midwest medical university we have almost all of our high voltage inside in a some what climate controlled enviroment (basement) with no sun exposure supported by cable trays. The cable is all copper three conductor, 15KV (running at 13.8 KV)IAC amoured cable, 133% insulation...
I am preparing a presentation to buy a 750 kva 3 phase transformer. I need some facts to present that will inform the "powers that be" that one type of winding is superior to another.