please write about the type of transformer, winding material and its specification,.
As cu losses are I2R losses, I depends on the loading of transformer and can be assumed for No load and full load but the R depends on the winding material, size and shape of winding conductor, cooling media etc.
Normal efficiency of transformers are 96 to 98%, hence 2% could be considered as losses, which is mainly copper loss. Yet copper loss depend on loading(continuous/short time over loading) and power factor of load, thus for 100KVA copper losses would be around 2KVA at continuous rated loading. Could refer my papers, "Micro processor based, over load time limit computation and control........for power transformers".etc.
There are losses after transformer is energized (without load): Fe core and also the other part of losses are load caused (Cu).
It is not easy to explicite define in % because during most of the time power transformer (in distribution and industry) is not loaded at rated power.
From my understanding about transformers, besides the data you have listed you should also be given the following:
1. Base Impedance in Ohms
2. Per Unit Impedance:
3. Per Unit Reactance
4. X to R Ratio (ration between reactance and resistance)
Using the Per Unit (p.u) system then you do not have to worry about transferring parameters from the input side of the transformer to the output and vice versa.
Once, you give me those parameters then I can help you calculate whatever you need.
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