Re: [TCML] Coil V4 fail

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Stephan,

The thing that really sticks out to me is that
you have WAY too much primary C. I be-
lieve someone has already mentioned this
(Scott Bogard?) and he is correct. I would
recommend the primary C be reduced down
to the 50 to 100 nFd range for more optimum
performance as your power supply could ne-
ver fully charge that massive of a primary C
in the milliseconds dwell time of your ARSG.
Remember, the stored energy of a charged
capacitor is directly proportionate to the
size of the capacitor but it will increase as the
square of the discharged voltage.

David Rieben




----- Original Message ----- 
From: "Teslalabor" <teslalabor@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, October 18, 2010 9:22 AM
Subject: Re: [TCML] Coil V4 fail


> Hi,
> really no one has any thoughts about my new TC and its melting SRSG, 
> because of its energy transfer problems?
>
> Here again two videos and the specs of the system:
>
> http://www.youtube.com/watch?v=3pUh3UVZdiE
>
> http://www.youtube.com/watch?v=Abr3rxYUH5o
>
> In my opinion the sparks should be far longer.
>
> Input: 0 - 400V 20A from variac
> Tank circuit: 4 PT's each 100V / 10000V. Connected in series on low 
> voltage
> side and parallel on high voltage side. So if variac is on 100%, every PT
> gets 100V and delivers 10kV. They are ballastet on the LV side via a 
> ballast
> inductor with air gap, so that the short circuit current without tank
> circuit is arround 950mA.
> Caps: 2 commercial BOSCH Pulse Caps each 25kV / 500nF in series, giving 
> 50kV
> / 240nF measured.
> Gap: Propeller Gap:
>
> http://www.youtube.com/watch?v=O84SI50g0NY
>
> Secondary is 25cm diameter, 1,5m long
> and wound with 0,5mm wire + 0,4mm spacewinding.
>
> The following problems: I think the coupling is to tight. Actually the 
> lower
> turn of the secondary is 3cm ABOVE the flat primary. When I put it lower, 
> I
> get bad racing sparks on the secondary surface.
> Should I remove some inner turns of the primary, so that I can put the
> secondary lower? Would this prevent the racing sparks?
>
> Next possibility: Is 240nF to much capacitance in this TC? The matched 
> capacitance for resonance at 50Hz are 318nF, so I actually run the system 
> slightly STR. I have some more of the pulse caps.
> Should I put a third one in series? Then I would get 166nF tank 
> capacitance. This would increase the bang voltage and so the bang size, of 
> course
> I would have to change the firing of the SRSG some ms earlier. Would this
> decrease the gap losses and so solve the heating problem of the SRSG?
>
> Best Regards
> Stefan
> _______________________________________________
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