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Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
OK, I have a few more no duty days (Chrismas time...), so I finished this project. It is a spherical topload SGTC (nothing special), but designed to obtain spontaneously the "swirling streamer effect".
The whole system is here:
It has a 800 turns, 36 cm secondary, on 11 cm diameter PVC pipe and a big sphere covered with alu foil, big enough to overload the system to achieve the max potential before spark formation.
The tank is here:
A few details:
-20 nF @ 20 kV MMC
- two 7 kV @ 25 mA little NSTs in parallel, for 7 kV @ 50 mA
-a safety gap with two 470 pF @ 30 kV doorknobs as filter caps:
-a multiple gap with a 40 W air fan. It needs a screw and a spring to be added later for fine variation of the gaps distance, but I didn't have the patience to finish it:
-the primary (taped at 5-th turn) and a cable switch, very good when taking pics/movies:
For the same settings of the SGTC (power input, gap distance, coupling, etc) we can influience the streamer formation just using different diameters spherical toploads. The method is using a smaller diameter sphere not connected with the main topload sphere, in a manner identical with the additional sphere on the electrodes of the electrostatic machines, to influience the spark formation. The idea is schematized here:
-the smaller sphere not connected to the main sphere, on an insulator cilinder:
The swirling streamer formation (unfortunately I can not get it permanently):
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Looking good Vasil...
I was watching your video and thought that maybe you should try to varnish your sphere to insulate it and prevent breakout, except on the top maybe an area the size of a coin could be left unvarnished for the swirl to form from...
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Yes, it is an idea, but I dont think that the thin layer insulation will count at the top voltages. As in plasma globes, where the internal electrode is contained in a glass sphere, which uniforms the field, but not insulate...
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Spherical topload SGTC
