On Thu, 26 Mar 2015 09:02:05 -0500, Ignoramus20394
wrote:


1) What is the likelihood that they are copper wound

Virtually certain.

2) What is the likelihood that they have PCB oil in them

fairly slim.

By the end of the 80s, government pressure had forced the removal of
PCB from effectively all electrical apparatus. There were and
probably still are companies that specialize in flushing old
transformers of PCB down to federal standards. Many old transformers
were/are essentially irreplaceable without commissioning custom
transformers designed and built from scratch with lead times measuring
in years.

Two of my factory clients went through this in the 80s. One was a
chemical plant with a contract for 200MW and the other a paper mill
with a contract for 500MW. Both brought in banks of trailer-mounted
transformers to sub while the main ones were flushed and filled with
PCB-free oil.

If the transformer has been processed then it must contain stickers
and a nameplate attesting to that fact. If those are missing the be
suspicious. Ultimately an inexpensive oil test will tell you for
sure.

Assuming you're buying those for scrap value, they look like they'd
contain enough copper to make an oil test worthwhile.

John
Chief Engineer
Fluxeon Corp.
John DeArmond
http://www.neon-john.com
http://www.fluxeon.com
Tellico Plains, Occupied TN
See website for email address