RE: Output of Neon Sign Transformers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Jun 2007 10:12:41 -0400
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: Output of Neon Sign Transformers (fwd)

Your NST is typically referred to as an 8kV/50mA, secondary mid-point grounded unit.  There are two high voltage terminals, and the voltage from the case to either of them is 4kV, and between the two terminals is 8kV.

You cannot tie the two winding in parallel, as they would be out of phase.  You need to use them in series, for 8kV.  This is why your MMC blew - If you just used 5 caps per string, it would only be rated for 5kV, and you were applying at least 8kV x 1.414 = 11.3kV to it.

What kind of caps are these?

Regards, Gary Lau
MA, USA



> Date: Mon, 18 Jun 2007 11:27:14 +0000
> From: Nicolas Alstrup <n_alstrup@xxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Output of Neon Sign Transformers
> 
> Hello,
> 
> I have found two identical neon sign transformers, that I am trying to build
> a Tesla Coil Around, but I am experiencing some difficulties..... My main
> problem is that I can't figure out my transformer output, and my MMC
> capacitors keeps blowing.....
> 
> The Transformers are from Neoncomp, www.neoncomp.fi, type "N 50/8 RE" and
> here is what it says on them regarding the secondary:
> 
> Us = 4000V - E - 4000V
> Is = 50 mA
> Pp = 520VA
> 
> On the homepage it is described as a 2x4000V transformer, but does that
> means it gives out 8000V?
> 
> I have parallel connected them, and beleive that should give a output of
> 4000V and 100mA. Right?
> I have used 40 x 0.047uF 1000V capacitors, 5 in string, 8 strings
> parralell.. This should give me 0,0752uF, and 5000V potential, but the
> capacitors keep blowing... Any Ideas, thoughts regarding the transformers?
> 
> Thank you very much, sincerely Gryphon
> 
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