Re: Dissolve Xfmr laminations

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slwhite-at-zeus.ia-dot-net>

I am finding this thread useful. I have had a 25 KVA 120/240/480 dry-type
distribution transformer for a while. It weighs about 300 pounds. I also
intend to disassemble the laminations to construct an air-gap ballast. As
stated, I intend to destroy the windings in order to remove them from the
laminations. This transformer does not appear to have anything on the
outside surface other than paint. If it did, I thought that I would simply
use a belt sander to remove any varnish on the outside of the transformer.

Steve: Coiling in Iowa

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 18, 2002 5:39 PM
Subject: Re: Dissolve Xfmr laminations


> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
>
> Tesla list wrote:
> >
> > Original poster: "Loudner, Godfrey by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
> >
> > Hi Daniel
> >
> > I would be concerned about stripping the coating on the laminations that
> > protects them from eddy currents. I have never had any trouble getting
apart
> > the laminations with a butter knife once a few of them have been
removed. Of
> > course it might be very difficult to get out the first few laminations,
and
> > the extraction might even destroy them.
> >
> > Godfrey Loudner
>
> The oxide coating on the surface of each lamination provides the
> necessary insulation, and if the laminations are packed in as tightly as
> they should be the varnish won't penetrate the stack.  All along I have
> assumed the purpose of this discussion was just to get the laminations,
> and not try to use the existing windings.
>
> Ed
>
>
>
>