Re: Output of Neon Sign Transformers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Jun 2007 10:39:55 EDT
From: Mddeming@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: Output of Neon Sign Transformers (fwd)

 
In a message dated 6/18/07 9:49:54 A.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:


---------- Forwarded message ----------
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 = 4000 V - E - 4000 V
Is = 50 mA
Pp = 520  VA

On the homepage it is described as a 2 x 4000 V transformer, but  does that 
means it gives out 8000 V?

I have parallel connected  them, and believe that should give a output of 
4000 V and 100 mA.  Right?
I have used 40 x 0.047 uF 1000 V capacitors, 5 in string, 8 strings  
parallel.. This should give me 0,0752 uF, and 5000 V potential, but the  
capacitors keep blowing... Any Ideas, thoughts regarding the  transformers?

Thank you very much, sincerely  Gryphon



Hi Gryphon,
 
I believe the 4000 E 4000 means 4000 V each side of  ground(E=earth), or 8000 
V across the two HV terminals.  Your can verify  this by applying line 
voltage to the hv side and reading the output from the  primary. Multiplying this 
ratio by the line voltage will give you the RMS  output voltage of the 
transformer.
But remember, your peak voltage is V x sqrt(2) which @ 4000 V  would mean 
5657 V peak, and at 8000 V is 11314 V. This could be the source of  your trouble. 
Your cap string has to withstand the peak voltage.
 
Hope this helps,
 
Matt D.



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