just to explain:
one suggest, that it was overloaded due to a shortcut and therefore a shutdown of the nuclear power plant brunsbüttel nearby.
SHORTCUT or SHORT CIRCUIT?
AFIK, the only way a short circuit could take down an adjacent plant is if the output of the smoking transformer took out an entire switchyard, including the buss tie to the other plant's output.
I would be very interested in finding out what happened.