2manynotez
Member
- Location
- Seoul, Korea
We have a site that at present has a delta-wye 12470-208/120 VAC Transformer, the transformer is maxed out and the utility is upgrading to a larger transformer, the new transformer they are providing is a wye-wye 12470/7200 to 208/120 VAC.
My question would be why, the site is a large warehouse converted to refrigeration storage, they have maybe 500 super freezers (my term) that keep products at -35 F. I believe all the compressors are 208 single phase (maybe 208 3 phase), if this is important I can get the actual motor specs). I do not believe there are any large harmonic rich loads.
In reading about wye-wye there seem to be some issues that you do not have with delta-wye transformers.
If I may offer my humble thoughts on this, having consulted to many a utility company, and served as engineering manager for a utility, my first guess is that it was a transformer they had on hand. You did not mention the capacity of the transformer, but I am assuming it is rather large [>1000 kVA].. and depending on the market, it could take up to 6 months to get a larger transformer in.
Just a thought...