Re: Doubling NST voltage? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sun, 29 Oct 2006 13:51:06 -0800 (PST)
From: Scott Kraus <plymouth_4406@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Doubling NST voltage? (fwd)

Curt,
   
   The weakest point of insulation would now be between the primary
windings that are tied in parallel and the cores. If you had them unpotted
and could add some nomex paper between the cores and the windings it may
work. Another option would be to feed at least one with a high voltage
isolation transformer.
   
  Scott

Tesla list <tesla@xxxxxxxxxx> wrote:
  Original poster: List moderator 



---------- Forwarded message ----------
Date: Sun, 29 Oct 2006 07:49:21 -0800 (PST)
From: C. Sibley 
To: Tesla list 
Subject: Re: Doubling NST voltage? (fwd)

It seems to me that if the cases were isloated and ungrounded this would
work, and the voltage across each NST wouldn't exceed their individual
output. The higher voltage would only exist across both, and would stress
the individuals. What am I missing?

Curt.


----- Original Message ----
From: Tesla list 
To: tesla@xxxxxxxxxx
Sent: Sunday, October 29, 2006 7:04:18 AM
Subject: Re: Doubling NST voltage? (fwd)


Original poster: List moderator 



---------- Forwarded message ----------
Date: Sat, 28 Oct 2006 15:46:31 +0100
From: resonance 
To: Tesla list 
Subject: Re: Doubling NST voltage? (fwd)



No this will not work.

The tar-like insulation in the nsts will quickly break down.

NSTs are really only designed to operate at 12 kV for 1/4 sec to ionize the 
gas in a neon tube. Then the voltage drops back to approx 500 volts and 
they serve as a constant current source to keep the gas ionized in the tube. 
They are not designed to provide HV for a long period of time. They do this 
in Tesla coil service but are constantly being strained in this operational 
mode. Double the voltage will not work. Also, you can't hook them in 
series because the center is grounded --- you would need two xmfrs without a 
center-tap grounded configuration to accomplish this task.

Dr. Resonance
>
> Is it possible to connect my NST's in series, for double the voltage? I've 
> run them in parallel before for the ma's, but I'm wondering if setting 
> them in series is do-able. If this has been done before, is there anything 
> I need to do re: grounding, connecting, or whatever with their cases? 
> FWIW, I'm thinking of using a couple of 9/30's. I don't have 220v 
> available at my workbench, so I'd have to stick with 110v, if that's an 
> issue. Thank you all in advance, for any info you might have.
>
> Neal.
>
>
>







 	
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