Loss in a transformer winding?

techntrek

Has anyone measured the loss in a generic 1-to-2 transformer winding (any size)? I know some use a 120-to-240 transformer to handle a specific load when all other loads are 120 volts, and I may have this need in the future. I'm trying to figure out how efficient they are. For some reason up to 10% loss sticks in my head.

nsaspook

Re: Loss in a transformer winding?

From 90% to 98% typical with grid AC power devices, with Toroidal Transformers on the top end of the scale in price and efficiency.

http://www.powertronix.com/high_efficiency.php

techntrek

Re: Loss in a transformer winding?

Exactly what I'm looking for, thanks.

RCinFLA

Re: Loss in a transformer winding?

Any reasonable transformer used for power transformation should be in the 98% range. This does not include your average 'wall wart' transformer that can throw away a couple of watts unloaded.

Efficiency does drop off at very low (<2%) rating loading where the primary magnetizing core losses dominate.

Losses are VA based, not true power watts.