Re: [TCML] Primary Capacitance Calculations

[bartb <bartb@xxxxxxxxxxxxxxxx>]

A note of caution for new users of Javatc. There are many capacitance 
outputs (resonance, LTR for static gaps, LTR for rotary gaps, etc..). 
Please note that the LTR values are for NST type transformers. For stiff 
supplies such as PT's or Pigs, you should be looking at energy at the 
gap outputs by inserting a cap value and running calculations down at 
the  gap area (no need to run the coil itself). You should also be 
inserting ballasted current in the transformer section of the program 
for these stiff supplies and not rely solely on the transformers VA 
rating (that's why the input for ballast current is there).

Regards,
Bart



DC Cox wrote:
> Use JAVATC.  It's not black box, but based on solid equations based on good
> physics (Gaussian distributions, etc.)
>
> Enter the data required in the transformer section and it will provide your
> exact xmfr impedances.  It will also give you a good cap value and pri turns
> value.
>
> With this size xmfr either a .06 uF 80 kV or 0.1 uF 80 kV cap will work very
> well.  For most medium size coils driven by pole xmfr, with spark output in
> the 6-8 ft range, I would go with the .06 uF size cap.  For coils running
> 10-15 kVA, with spark output in the 10-15 ft range, the 0.1 uF size will
> work best.
>
> Be sure to use a large coil dia, in the 16" to 20" range for optimum
> performance from a pole xmfr powered coil.
>
> Dr. Resonance
>
>
>
>
>
> On Sun, Apr 11, 2010 at 9:28 PM, Thomas Schmit <Thomas.Schmit@xxxxxxx>wrote:
>
>   
> > Hello All
> >
> > I'm suspicious of all these "black box" calculators and equations that I've
> > found for determining the primary capacitances. I'd like to determine a good
> > capacitance to use in my primary tank circuit driven by a 7200 V, 10 KVA
> > pole pig.
> >
> > I'm currently a long distance away from my pole pig and I can't measure
> > it's actual output impedance.
> >
> > Any advice? What are the values of your pole pig driven primary LC
> > circuits?
> >
> > Thanks!
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> >     
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