hello,
I have to integrate an 8MVA power transformer in parallel with another one, which is quite identical and already on the network.
In a practical way, please explain me how I can proceed to complete this project

 

Really, you are dealing with that kind of power and you come to a hobbyist forum for help?

 

Do you really mean 8KVA? 8000VA is a fair amount,
I am also aware that some use the "M" for thousand instead of for million.
Independent circuit protection will certainly be required.