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Re: [TCML] Pole Pig Cap



Why not use the roll of wire as a ballast as is? I've heard of folks using 500' spools of wire as ballasts without any additional effort. Simply hook up a Jacob's Ladder (climbing arc) and measure current draw. You may already have what you need.

Adam

--- On Mon, 6/8/09, Tyler Pauly <rpggod714@xxxxxxxxx> wrote:

> From: Tyler Pauly <rpggod714@xxxxxxxxx>
> Subject: Re: [TCML] Pole Pig Cap
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Monday, June 8, 2009, 6:08 PM
> 
> My more pertinent question is about STR caps.  Will
> this result in large streamer-length loss, or will I be okay
> going with a STR cap?  
> 
> Also, for my ballast, can I individually insulate the
> welding rods with a layer or two of electrical tape? 
> Would that be sufficient?  
> 
> Thanks again guys,
> Tyler
> 
> 
> PS: I'm gonna try out the 10 AWG anyways, I already got a
> roll really cheap... at least it'll be exciting.  :P
> 
> 
> 
> 
> 
> ----- Original Message ----
> From: DC Cox <resonance@xxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sunday, June 7, 2009 9:16:40 PM
> Subject: Re: [TCML] Pole Pig Cap
> 
> The pulse rate of the 35 kV Maxwells is usually around 2-3
> pps, not high
> enough for the 400 ppps a large coil operates best at.
> 
> The 10 AWG is not large enough.  The xmfr hits peaks
> drawing approx 7-8
> times the average current value.  You should use
> 6  AWG at 60-70 Amps over it will over heat.  Ask
> me how I know this ---
> melted windings.
> 
> non synchro around 400 pps is the best way for large
> sparks.
> 
> DC
> 
> 
> 
> 
> On Sun, Jun 7, 2009 at 3:41 PM, Tyler Pauly <rpggod714@xxxxxxxxx>
> wrote:
> 
> >
> > I'm still brainstorming on my choice of tank cap for
> my 10 kVA pig.  The
> > goal was to run it around 12-14 kVA  by means of
> 240V 50-60A.  It will be
> > limited by a ballast inductor of 10 gauge wire wound
> around a PVC form with
> > individually insulated welding rods inside.  I
> will soon be testing the
> > ballast to see if the 10 gauge can take short run
> times without going up in
> > flames.
> >
> > As to the capacitor choice, I'd love to go with one of
> DC's .1 mfd 80kV
> > caps but I just can't afford one at the moment. 
> I looked at the standard
> > 37667 Maxwells but I don't think I'm comfortable with
> running single cap
> > strings, as the 35 kV rating just isn't high enough
> for comfort, unless
> > someone else has run w/o problems?  MMC's seem to
> be out of the question as
> > well, unless there is some cap I haven't yet found.
> >
> > However, all of the above thought process was assuming
> trying to get
> > ~.1mfd.
> >
> > I recently came upon documentation of STR caps. 
> I was scanning the archive
> > for STR caps with pole pigs, and I can't really find
> much.  What is the
> > consensus on having a STR cap?  I was hoping for
> something around .04-.05
> > mfd.  Cres looks to be .092 mfd for 60A input and
> .0767 mfd for 50A.
> >  However, these C values don't take into account
> the L of my ballast, which
> > seems to be important.  I don't know how to do
> this...
> >
> >
> > What I could find on STR's usually associated them
> with ARSG's; why is
> > that?  I had planned on using a RSG.
> >
> > If STR's are an accepted cap choice, this would really
> help cut costs;
> > since I'm still technically a poor college student, I
> can't really drop 750
> > dollars on capacitors.
> >
> > Thanks guys for all the help.
> >
> > Tyler
> >
> >
> >
> >
> > _______________________________________________
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> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
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> 
> 
>       
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