Re: New 4" coil: R.Hull and CSN, Secondary Varnish

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Original poster: "Writeme Now by way of Terry Fritz <twftesla-at-qwest-dot-net>" <writeme42-at-hotmail-dot-com>

Hi,

Has anyone ever used enviro-tex as a secondary coating.
Its the stuff they use on bar tops for a rock hard finish.

Cheers,

        Dan


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: New 4" coil: R.Hull and CSN, Secondary Varnish
>Date: Fri, 30 Aug 2002 16:16:54 -0600
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>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><megavolt121-at-attbi-dot-com>
>
>Dave
>   My last secondary used a two part epoxy like "varnish"
>called Pour-On. It creats a hard coat as thick as you
>pour on there which protects the windings quite well.
>
>-alan
> > Original poster: "Dave Hartwick by way of Terry Fritz 
><twftesla-at-qwest-dot-net>"
> > <ddhartwick-at-earthlink-dot-net>
> >
> > Guys,
> > What is the current thinking on applying secondary insulation, in this 
>case
> > MinWax gloss polyurethane? There was a time when multiple coats to build 
>a
> > up a thick layer was desirable for  corona suppression, racing arcs, 
>etc.
> > Richard Quick was one such advocate.
> >
> > I note that Richard Hull advocates minimum or no varnish at all, stating
> > that pretty secondaries with lots of varnish are also lossy. I've got 
>about
> > 5 coats on the new 4" secondary (#26, 1500 turns) and am thinking that's
> > enough, maybe too much. I've never done A B tests with identical 
>secondaries
> > that differ only in varnish quantity.
> >
> > I also wonder how Glyptal and other substabces compare in terms of
> > lossiness.
> >
> >
> > Generally regarding Rich Hull's work: I'm now reading his Guide to the
> > Colorado Springs Notes--1993, 2nd edition 1995). Here he addresses the
> > secondary insulation matter. He also concludes, for example, that cap 
>size
> > for a given transformer should be smaller than is generally advocated 
>today.
> > He says that a 5kVA 14.4 kV piglet won't handle a 0.06 ufd cap, that 
>0.005
> > ufd is largest a 15/30 NST will power up. This is certainly at odds with
> > more recent LTR methods.
> >
> > The overall question is what is still viable from work generated 8-10 
>years
> > ago? And that goes for any theory that is some years old now. Certainly,
> > much of his conclusions are still valid--Big toroids, magnifier theory.
> > Dave Hartwick
> >
> >
> >
> >
> >
>
>
>