RE: Secondary Internal Gaseous Insulation (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 19 Sep 2007 11:53:28 -0500
From: Crispy <crispy@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: Secondary Internal Gaseous Insulation (fwd)

Really, I'm just trying to build a bullet-proof coil.  My previous coils
have all used Sch.40 PVC pipe as secondary formers, but on this one, I'm
going to use sewer pipe, which is rated at "Gravity Flow".  I'm guessing
this means that the walls are thinner, and I'm just a little concerned
about the effects that could have.  I'm planning on preparing the
secondary in a way similar to what Dr. Resonance suggested in the recent
thread.  I'll sand it down, coat both the inside and outside in spray
polyurethane, and add acrylic baffles sealed with silicone near the
ends.  After being wound, I'll cover it in glyptal and possibly more
polyurethane spray.  I'm just wondering if there should be something
else between the two internal baffles.

Thanks for all the feedback,
Chris

On Wed, 2007-09-19 at 06:45 -0600, Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Wed, 19 Sep 2007 08:45:47 -0400
> From: "Lau, Gary" <Gary.Lau@xxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: RE: Secondary Internal Gaseous Insulation (fwd)
> 
> Since internal secondary breakdown can normally be avoided simply by
> keeping the windings on the exterior of the form, I would ask - What is
> unique to your situation that warrants such extreme measures?  It's
> simply not normally a problem.  Have you actually experienced internal
> arcing, or are you just trying to make a bullet-proof coil?
> 
> Gary Lau
> MA, USA
> 
> 
> > > From: Crispy <crispy@xxxxxxxxxxx>
> > > To: tesla@xxxxxxxxxx
> > > Subject: Secondary Internal Gaseous Insulation
> > >
> > > Hello,
> > >
> > > Has anyone ever tried preventing internal secondary arcing by
> filling
> > > the secondary with some sort of insulating gas, such as sulfur
> > > hexafluoride?  I think it would be fairly easy to do so, considering
> SF6
> > > would sink and could be sealed in the secondary with baffles.  I
> just
> > > can't find a good source for it.
> > >
> > > Chris
> 
> 
>