Visigoth’s? A point, very small though.
It could be a test to see what the reactions and repair times for that type of damage is.
I’m wondering why the Vandals breached the perimeter fence when they could easily perforate the transformer cans from safely outside - probably right out of their vehicle?
...Unless they wanted to go in and leave a little present with which to surprise the trained technicians who try to repair the damage and LEOs who come to investigate.
Transformers are not the only commodities which might be difficult to replace.
I hope that the dogs have been sniffing around for any ham sandwiches or misplaced cell phones that might have been left lingering about that substation or down in that manhole...