RE: Output of Neon Sign Transformers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Jun 2007 13:34:01 -0400
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: "Lau, Gary" <gary.lau@xxxxxx>, Tesla list <tesla@xxxxxxxxxx>
Subject: RE: Output of Neon Sign Transformers (fwd)

Oops, I missed that you actually have two complete, identical NST's.  I thought you were talking about paralleling the two 4kV halves.

Yes, you can parallel them for 8kV/100mA, but your caps still need to have a higher voltage rating.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: Lau, Gary
> Sent: Monday, June 18, 2007 10:13 AM
> To: 'Tesla list'
> 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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