external circuit- stranded loss calculation

Hi,

I designed a circuit like below in external circuit excitation.When I calculate according to the datas I got from the analysis, I find the stranded loss value different from the stranded loss value shown by the program.

The calculation formula I made with the data I obtained as a result of the analysis is as follows.

rmscurrent(winding1)^2*R8+rmscurrent(winding2)^2*R9+rmscurrent(winding3)^2*R10+rmscurrent(winding4)^2*(R23+R20)+rmscurrent(winding5)^2*(R21+R24)+rmscurrent(winding6)^2*(R22+R25)

My calculation result = 6000W stranded loss value provided by the program = 5000W.

What is the reason for it to come out different? Is there a mistake in my calculations? or will the error in the winding dimensions drawn on the model affect these losses?

Thanks in advance.

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