I was reading some solved problems about transformers but I don’t understand how was calculated the losses in the copper.
A one phase, 10kVA, 2400/240, 60Hz distribution transformer has the following characteristics:
- Core loss at full voltage=100W
- Copper loss at half load=60W
Determine the efficiency of the transformer when it delivers full load at 0.8 power factor lagging.
PCU,FL (Full load)=60(\$**2^2**)=240W\$
The Efficiency is then
Not a big deal, but why the copper loss at half load was multyplied by \$2^2\$? What is this?