Re: [TCML] finishing a secondary - would insulating foam be a goodidea?

["Jeff W. Parisse" <workshop@xxxxxxxxxxxxx>]

In the early years, we had internal flashovers probably because we power our 
coils at much higher levels than NST/MOT or small pig coils.

Now, we use three internal baffles; one for HV and the other two for 
structural shaping (and a little bit of HV insulation thrown in (can't be 
too careful).

Jeff

In so far as the foam.... Test it first to see if it carbonizes in the 
presence of corona.


----- Original Message ----- 
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Saturday, October 04, 2008 7:24 AM
Subject: RE: [TCML] finishing a secondary - would insulating foam be a 
goodidea?


I've not previously heard of anyone using the expanding foam to fill a 
secondary, but it seems like it would do a good job in preventing internal 
arcing.  I can see no down side to doing that.

However, the vast majority of secondary coils are built without any internal 
baffles or other measures and problems simply don't occur, unless 
construction errors like allowing the wire to enter the tubing are made, or 
if the coil is absurdly over-powered.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Thomas Ryckmans
> Sent: Saturday, October 04, 2008 8:40 AM
> To: tcbouklist@xxxxxxxxxxxxxxx; tesla@xxxxxxxxxx
> Subject: [TCML] finishing a secondary - would insulating foam be a good 
> idea?
>
> Hello,
>
> I am finishing my 4 inches/10 cm diameter secondary, fitting a few PPE 
> disks
> inside to prevent arcing and a couple at the ends to help fitting with
> primary base and the topload respectively
>
> Would it be a good idea to fill the secondary tube with insulating foam to
> further prevent internal arcing? The foam is the one that come in 
> canisters
> and expands and harden once sprayed. Polymer is either polyurethane or
> polystyrene.
>
> Many thanks for your comments,
>
> Thomas

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