Re: [TCML] Re:Pros and cons

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

I guess people working with drsstc ,like Steve W.,may want
to check this theory about small voltage (200kV<) and limited
spark growth.For example they can set primary energy such
that in loseless transfer secondary is brought to  potential
of 200 kV.The voltage in a real world will be lower due to
loss.Sharp breakout point should be attached to toroid to let 
sparks form.Comparison of spark lenght between s.s. bursts and 
100,200,300 BPS runs will give us idea about general behaviour
of "small" output voltage coils.I'd like to check this myself,
but I don't have drsstc.My 5kv/20mA NST powered table-top coil
can't run  s.s,and I don't know exactly primary voltage and
energy (funny , I don't know even power input since ammeter
goes reading-crazy when the coil fires).

Dex       

--- jimlux@xxxxxxxxxxxxx wrote:

--- uhvsystems@xxxxxxxx wrote:
> Jim,
> 
> 200-300 kV is a very interesting remark.This is a voltage range where
> first appearances of so called *leader corona* and *leader flashes*
> are experimentally observed.That should have consequences to the
> behaviour of the sparks in HV impulses machines like tesla coils.To
> illustrate,if 250 kV SGTC is in position to prolong sparks 3x their
> single shot lenght at typical PPS rates,with 100 kV and
> corespondingly smaller impulse energy it wouldn't do much better ,at
> typical break rates,than about 1.3x spark lenght  in 100 kV single
> shot discharge.
> 
> 

In fact, lower voltage coils,like the very small ones using a 
electromechanical interrupter (buzzer), tend not to have long sparks, 
but more of the brushy discharge or lots of shorter sparks, say, 10cm 
long. So your observation is interesting about leader corona.

The maximum voltage at the top of the tesla coil is almost certainly 
limited by the radius of curvature of the electrode, and empirical 
evidence suggests that toroids are better than spheres, even though the 
max voltage is less for the same overall size.





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