If Ukraine’s electricity is the same as EU then why would the transformers need to be custom built?
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If ...
I can only report that WiU said many are custom built - I cannot confirm if he is correct, but then, unlike him, I’m not a Ukrainian, nor live in Ukraine.
Germany may supply Ukraine with transformers, but when? - also remember Ukraine was a Soviet state with a Soviet railroad system and I would guess that also applies to the electrical grid and its components. Just because the voltage may be standardized, does not mean the components are.
FWIW:
“The Ukrainian power grid was built when it was part of the Soviet Union, has been upgraded with Russian parts and (as of 2022), still not been fixed.”
https://en.wikipedia.org/wiki/Ukraine_power_grid_hack
Thanks!