Quoting kasper-at-exo-dot-com:

> I have 2 12KV transformers.  They are about 2.5' cubed and 
> filled with oil.  I have been able to tell the output voltage 
> by placing 10VAC on the input and measured 1200VAC on the 
> output.  The tricky part is how to tell what the power rating 
> is.  There is no indication of who made them or any stickers or
> plates on them of any kind.

Ahh, mystery core!

> Does anyone have any ideas on a semi-easy way to tell what the
> maximum safe power output of the transformers are?

This may sound really stupid, but how physically heavy is one of
these units including the oil? I find you can tell a great deal
about kVA power ratings from the approximate weight of the unit.

Richard Quick

... If all else fails... Throw another megavolt across it!
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