Re: [TCML] NST Questions

[Michael Gray <graymp89@xxxxxxxxx>]

Adam, I'm pretty sure it's not switch mode, but I've not a great deal of
experience with transformers so I could be wrong. Why do you ask; does it
look like a switch mode NST to you?

http://vinklightingsolutions.com/wp-content/uploads/2011/11/10.000-50-RESINBLOCK-2000-COMPACT-ENG.pdf

Matt, thanks for the response. Very helpful.

Would you guys say that this would be suitable for use as a PFC cap?

http://uk.rs-online.com/web/p/polypropylene-film-capacitors/3888033/

It's a 'run' type polypropylene film cap.

Cheers


On 7 January 2013 15:00, ADAM MUNICH <ajm9414@xxxxxxx> wrote:

> 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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