Re: [TCML] Pre-Launch Prep Procedure

[Mike Gray <graymp89@xxxxxxxxx>]

NST is 10kV 50mA, and my cap is designed to approx 41nF. However I have no
way of measuring it so I can't be sure. My multimeter says it can measure
capacitance but I can't figure it out, I think it's more a gimmick selling
point than a real measurement function. The 41nF is the optimum larger than
resonance value for a sync gap, according to TeslaMap. My cap array is 7
strings of 8 of these:

http://media.digikey.com/pdf/Data%20Sheets/Kemet%20PDFs/PHE450SD5470JR06L2.pdf


On 12 July 2013 19:59, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:

> What size is your NST and cap?  You may be getting resonant rise, in which
> case your safety gap is doing its job.
>
>
>
>
> ________________________________
>  From: Mike Gray <graymp89@xxxxxxxxx>
> To: Tesla Coil Mailing List <Tesla@xxxxxxxxxx>
> Sent: Friday, July 12, 2013 1:36 PM
> Subject: [TCML] Pre-Launch Prep Procedure
>
>
> Hi all. I'm having some trouble sorting out the correct pre-launch
> preparation, specifically the Terry safety gap. What I currently believe to
> be correct is this. In order to set the safety gap to just wider than the
> max arc width the NST can produce, I first of all disconnect everything
> else from the safety gap except for the NST. I then narrow the safety gap
> so that it fires when the NST is fired up. I then gradually widen the gap
> whilst at the same time firing up the NST, looking for the point at which
> the NST can no longer produce an arc between the gaps. When I get there, I
> leave the safety gap in that exact configuration for TC operation.
>
> Trouble is, when I then go to energise the TC itself with everything
> connected up again, the safety gaps fire when I'm at around 50-60% on the
> variac. I can't understand how this happens!
>
> So I thought maybe it's best to set the safety gap width with the rest of
> the TC hooked up rather than in isolation. But then what to do with the
> main gap (SRSG)? I've tried removing just the SRSG, and with the rest of
> the TC hooked up try to set the safety gap width. In this case it started
> to fire less frequently and with louder arcs each time I made it wider, and
> this didn't sound right so I stopped. Thought it best to ask for advice
> before I explode something...!
>
> So what's the best way to set up the safety gap?
>
> Cheers guys.
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