[AMRadio] Re: 500 Transformer

[russ dworakowski]

I have an  old stove  in the basement-  used  to be used for  canning etc.  
the oven is never used for cooking food  here, so-  perfect for  baking  
transformers and  paint hi.   Russ.






>From: "Eddy Swynar" <gswynar at durham.net>
>Reply-To: amradio at mailman.qth.net
>To: <amradio at mailman.qth.net>
>Subject: Re: [AMRadio] Re: 500 Transformer
>Date: Wed, 12 Feb 2003 21:31:23 -0500
>
>Jeff,
>
>Baking transformers behind the XYL's back is a CINCH---the REAL challenge
>comes when you're trying to bake on an enamel finish paint job on some
>enclosure that you sprayed earlier...!
>
>Even I must admit to doing such things REALLY early in the morning (when
>she's asleep), or when she's out on some errand!
>
>~73~ Eddy VE3CUI - VE3XZ
>
>
>
>
>
>
>----- Original Message -----
>From: "Jeffrey J. May" <jeffreymay at worldnet.att.net>
>To: <amradio at mailman.qth.net>
>Sent: Wednesday, February 12, 2003 7:17 PM
>Subject: Re: [AMRadio] Re: 500 Transformer
>
>
> > Hi John!
> >   You mean that your wonderful xyl lets you use her oven! 68F here
> > today!..73..Jeff..W0XV
> > ----- Original Message -----
> > From: "John Leer" <jleer at execpc.com>
> > To: <amradio at mailman.qth.net>
> > Sent: Wednesday, February 12, 2003 6:24 PM
> > Subject: Re: [AMRadio] Re: 500 Transformer
> >
> >
> > > Regarding drying transformers etc. I have been drying transformers and
> > > chokes for quite a few years. I have used both electric and gas ovens
> > > with no apparent difference in results. I store my spare transformers 
>in
> > > an unheated outbuilding and temperatures here in Wisconsin run from 
>-20F
> > > to +100 so condensation can be a problem in many different devices. I
> > > first check the resistance from winding to core with a small hand held
> > > megger which applies about 1000 volts. I find many transformers and
> > > chokes will have an indication of leakage to ground after a year or so
> > > in storage. After baking for 4 hours or so at 200+ degrees and 
>allowing
> > > to cool, the megger will indicate infinite resistance winding to core. 
>I
> > > have found a something strange, to wit, if the measurement is taken 
>soon
> > > after removal from the oven , the megger will still indicate a leakage
> > > resistance. Upon cooling the resistance will usually be infinite. The
> > > transformers with tar type potting seem to be the worst offenders at
> > > absorbing moisture. I assume this is due to cracking of the tar. John
> > > K9XH
> > >
> > > Donald Chester wrote:
> > > >
> > > > Be careful about using a gas-fired oven to dry out the transformers.
> > Water
> > > > is a by-product of gas combustion, and the air will carry plenty of
> > water
> > > > vapour.  Better to use an electric stove oven.
> > > >
> > > > If you are in no hurry, bring the transformer into a dry, heated 
>room
> > and
> > > > store it there over the winter season.  By the time you start 
>cutting
> > off
> > > > the heat in the spring, the transformer should be well dried out.  
>It
>is
> > > > more effective to let the moisture gradually evaporate from the guts
>of
> > the
> > > > transformer, just as it gradually condensed there when the 
>transformer
> > was
> > > > in a moist environment, and there will be less likelihood of
>abnormally
> > hot
> > > > temperature causing deterioration of the insulation.
> > > >
> > > > Don K4KYV
> > > >
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