[Milsurplus] Drying Out an Open Frame, Large Power Transformer.

[Bob Camp]

Hi

One thing that is not mentioned is if the transformer is rusted. Rust creates several problems.
It’s hygroscopic, so your drying process will reverse it’s self. It’s magnetic, so you can “short out”
laminations magnetically. Finally, it will continue to “eat’ the iron if left untreated. 

Once you get things good an dry, address any rust issues.

Bob

> On May 8, 2015, at 7:31 PM, don davis <dxguy at earthlink.net> wrote:
> 
> Hi Dave
> 
> My work with NASA and Aerospace Corp. materials scientists almost always did
> this type of "salvage" at ~150 deg F, purged with dry  GN, with circulating
> air.  Heating from inside out sounds good, but keep well below boiling
> point.  Put in dry place  with small fan circulating air to keep local H2O
> partial pressure low.   I would do this for at least a week or more before
> testing - Brownian motion energy gets very low for the last 1 or2% of
> remaining water.
> 
> Good Luck.  73 de don ad6pb
> 
> 
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