Re: [TCML] MAX SPARK FOR FIXED VOLTAGE

[DC Cox <resonance@xxxxxxxxxxxx>]

Output potential is Vsec = Vpri (peak) x 70% x SQR(Lsec/Lpri).

Also max potential is a function of inductance, whereas:  Vsec = L x dI/dt
(rate change of current with respect to time).

Inductance goes up as the square of the radius of the sec coil, and
generally large inductances produce higher potentials.

Spark length depends of total power and also the repitition rate (pps) of
the spark gap and it's ability to properly quench at the power level
being used.  Once a large volume of ions are created above the HV terminal,
then it's a "pumping action" every time the sec fires into this ion cloud.
The residual ions help to make the spark "grow" in length even though the
potential is lower.

It's quite possible to get 4-5 ft sparks at 100 kV IF the power level and
rep rates are high enough.  As an example a typical coil running 450 pps on
the break wheel, with a 100 nF capacitor (0.1 uF), runs a true 1 million
volts with a 14 ft. long sec spark.

Again, rep rate, power levels, and efficient quenching are required to
produce high performance even at lower potentials.

Solid state coils exceed these performance levels due to their highly
efficient switching and lack of losses used to heat the spark channel in a
standard
type spark gap.

If you operate any Tesla coil in a single shot mode, firing once every 15
seconds, then this spark length is a very accurate indicator of the coil's
maximum output potential.  It agrees with the equations I have listed above.

Dr. Resonance







On Tue, Mar 10, 2009 at 11:37 AM, Dex Dexter <dexterlabs@xxxxxxxxxxx> wrote:

>
> I have a good question I don't know answer to.
> QUESTION:
> What is aproximately maximum spark lenght possible for a given output
> voltage Tesla system generates?
>
> Regardless of the efficiency,how long spark can be produced by a Tesla-type
> impulsive devices with voltage levels:
> 1) 100 kV
> 2) 200 kV
> 3) 300 kV
>
> Can a high power impulse source,like a Tesla transformer,put out a 10 feet
> long spark with 'only' 100 kV voltage peaks?
> To accomplish that it is free to use any power input level,any size and
> shape of  a terminal capacity,any firing rate wanted,andthe best high
> frequency excitation waves mix.DRSSTC,VTTC,etc.
> The only limiting thing is not to exceed 100 000 V terminal potential.
> Supposing a normal atmosphere enviroment is that possible?
> I know that in no circumstance 50 kV can close 5' wide gap unless directly
> conducting path is formed somehow,or a
> strong external ionization occurs ,like exposure to a flame,extremely
> powerful lasers,but Tesla transformers are the
> champs of 'spark pumping' and I was wondering what could be done with 100
> kV.
> Thanks for  your answers and explanations.
>
> Dex
>
>
>
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