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" <[EMAIL PROTECTED]>
Reply-To: amradio@mailman.qth.net
To: <amradio@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" <[EMAIL PROTECTED]>
To: <amradio@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" <[EMAIL PROTECTED]>
> To: <amradio@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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>
>
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