Re: [TCML] NST Questions

[ADAM MUNICH <ajm9414@xxxxxxx>]

Is that a switch mode NST? If so, it might fail in TC use...

On Sun, Jan 6, 2013 at 7:07 PM, <mddeming@xxxxxxx> wrote:

> Hi Mike,
>
>
> 1) Caps:
> For historical reasons that have been discussed at length in the archives,
> 25 mf means 25 uf so they're really only 20% different. PFC values are
> nominal values, after which optimization is cut and try.
>
>
> 2) Current: 50ma is what it is designed to deliver continuously into a
> normally operating neon tube. 65ma is the max current into a dead short.
> For a spark-gap coil, you will probably see something between these two
> numbers. Since many coilers use a variable transformer (Variac) to run
> their coils at 10-15% higher input voltage than design, I would suggest
> using the larger number as a starting point.
>
>
> Matt D.
>
>
>
> -----Original Message-----
> From: Michael Gray <graymp89@xxxxxxxxx>
> To: Tesla <Tesla@xxxxxxxxxx>
> Sent: Sun, Jan 6, 2013 5:05 pm
> Subject: [TCML] NST Questions
>
>
> Hi everyone. I've just subscribed to this TC mailing list - so I'll start
> by wishing everyone a happy New Year!
>
> I'm currently building my first TC (in the UK), and I'd really appreciate
> some opinion and advice on a number of questions I have. I've actually
> built most, nearing all, of the bits and pieces (just finished my toroid)
> and I've made a note of questions or issues I've had along the way. I'm
> using a couple of TC programs to assist in my design; TeslaMap and Tesla
> Coil CAD. My questions concern the NST I chose, a 10kV 50mA unit with
> ground fault current interrupt removed. The datasheet for it can be found
> at:
>
>
> http://vinklightingsolutions.com/wp-content/uploads/2011/11/10.000-50-RESINBLOCK-2000-COMPACT-ENG.pdf
>
> 1. On the datasheet it gives two values for secondary current. It says 'Max
> secondary current: 50mA' and underneath it says 'Short circuit current:
> 65mA'. Does this mean that the 50mA value is the point at which the GFCI
> would normally kick in? And if so should I be using the 65mA value in my
> calculations (since I've removed GFCI)?
>
> 2. I'm not sure what to use for my power factor correcting capacitor. The
> datasheet suggests 25mF, but the TeslaMap program suggests 30.1uF. Clearly
> this is quite a difference! I'm aware that the manufacturers value will be
> accurate, and that actually this size cap can be unpractical to
> acquire/create so a lower value is often used instead since this still
> helps. But this is a huge difference, and how is the program even
> calculating that value? My understanding is that the closer you can get to
> the ideal PFC value, the better, but it's not crucial to reach it. So
> what's the significance of the 30.1uF value?
>
> 3. Again, the TeslaMap program and the datasheet disagree, this time over
> power. Although this doesn't really affect my design, I'd still like to
> clear it up. TeslaMap says 513W and the datasheet says 282W. I'm inclined
> to believe the manufacturers value on this one... but what do you think?
> And why is there such a difference?
>
> I have some more questions but I'll leave them for now.
>
> Any advice would be great, thanks!
>
> Mike
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>
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