Re: Output of Neon Sign Transformers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Jun 2007 15:35:54 +0000
From: Nicolas Alstrup <n_alstrup@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Output of Neon Sign Transformers (fwd)

Hey thank you very much,

wow 3 replys in a day, this seems like a very helpfull group ;-)
I'll try making a bigger cap string with the right capacitors. And since its 
8000V at 50mA per transformer, I think I will use only one transformer at 
first, as my Coil - or coils, its a twin coil - is not so big......

Once again thank you.

Sincerely Gryphon




>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: Output of Neon Sign Transformers (fwd)
>Date: Mon, 18 Jun 2007 08:17:02 -0600 (MDT)
>
>
>---------- 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.
>
>
>
>************************************** See what's free at 
>http://www.aol.com.
>
>

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