ECN Forum Forums General Topics of the Trade General Discussion Area Small transformer better than over sized?

Several years ago the US government passed an 'Energy Act'. One of the most visible outcomes was the 'killing off' of incandescent lamps, another was the requirement that small power transformers (e.g. non-utility installations) be designed with 'ideal' efficiency at 35% loading.

So a 1000kVA transformer would be most efficient at 350kVA, but it may still be less efficient than a 350kVA unit loaded to 100%.

Have you done a loss (cost of ownership) analysis yet?