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Re: [TCML] Primary Capacitance Calculations



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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