Most Sub station transformers like the one in the video which form
the looks of the bushing size is at least 69kv or possible 138kv
normally have fuseing on the High voltage size and then go to buss
work and feed distribution breakers for the journy out to the line
system so for my 2 cents worth i would have to say there was an
equiment failure on the lower voltage side of the transformer and
that could be anywhere from 4kv which in getting scarce up to 13.8kv
which caust a failure on the transformer tank that lead to the
massive fire ball that followed what looked to be some kinda liquid
spraying toward the arc and from what was stated earlier in the
posting it can take several days to put that kind of fire out once it
gets going good 1st because you cant get at it because the heat
2nd from working with fire instructors and hearing the stories they
had to tell about fires when there were old trandfomers being scrapped
out and got lit off from a cutting torch 1 they worked several days
to control
I am a Station Electrician workign at for a utility company at one of
there generating stations I havenot seen a fire like that in person
yet at our plant but have seen the videos that are sent form other
utilities for training purposes not good to see for sure
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