Hello, Don -- I heat large xfmrs by shorting the primary with an AC
ampere meter and connecting the secondary to a variac that is connected
to the electric mains. I increase the the sec. V until I arrive at
the normal pri. current. I put a folded in half bath towel over the
unit to hold in heat. After a few hours, the xfmr should be almost too
hot to touch. Continue for a few days. At this point, the xfmr should
be dried out. At this point, polyester laminating resin can be poured
into the windings to fill the air spaces. When the resin hardens, the
xfmr will not absorb moisture, it will be able to get rid of internal
heat better, and the insulation will be improved.
- note - xfmr potting is covered in:
http://www.somis.org/D-amplifiers3.html
cheerz
On Sep 17, 2005, at 9:51 PM, Don Lemley wrote:
>
> Hi all,
>
> Ok, I know this has been covered here before, but is there a
> consensus on how to get the moisture out of HV plate transformers and
> chokes, so they won't arc on me. And before everyone jumps in with the
> quick
> "just put it in an oven on xxx degrees for yy hours", I am working with
> the
> iron from a Broadcast transmitter, specifically, the Gates BC-1G so
> these
> things are 100, 150 lbs each, and my XYL would REALLY not like it if I
> tried
> to put them in her fancy oven. They have been sitting in an
> un-conditioned
> but dry hanger/garage for several years, so I am certain they have
> soaked up
> a good deal of moisture over that time.
>
> Thanks for any suggestions,
>
> Don - W8HRQ
>
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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