[Boatanchors] Drying power transformer

[Ron]

Vic.
I too had an old TV transformer that sat in a garage that was humid.
I didn't expect trouble as it seemed dry but it did break over and after 
that , I could never get it to clear up.

Put it in a dryer and if you happen to have a vacuum chamber , use that 
as well.
If you can get a heated vacuum dessicator ...all the better.
Go to 100 C as the transformer should easily handle that.

---
Ron



Brian Clarke wrote:

>Hi Vic,
>
>TV-type power transformers were usually sealed up with polyurethane-style varnishes 
>rather than wax or pitch. The likelihood of your getting water through such a coating 
>is very small.
>
>I'ld be inclined to carry out a HiPot test - you know, very high Voltage with current 
>limiting and measure the leakage current between windings and to frame.
>
>73 de Brian, VK2GCE.
>  Vic asked:
>
>  I have a TV-type power transformer that a friend recently gave me which was 
>  sitting in his garage for several (maybe more than several) years.  He hooked it 
>  up and measured voltages, which are within spec.  The question is, before using 
>  it in a project, should I put it in the oven for a few hours at low temperature 
>  (say 150 f) to drive out any moisture?
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