Re: [TCML] Pole Pig Cap

[DC Cox <resonance@xxxxxxxxxxxx>]

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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