Re: Doubling NST voltage? (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 30 Oct 2006 19:17:54 -0400
From: Gregory Morris <gbmorris@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Doubling NST voltage? (fwd)

Forgive me for being naive, but to me it seems that either way, whether 
you ground the centre or not you are going to see a 15kV difference 
between the outputs. In the centre-grounded situation one end is 7.5k 
above ground, and the other is 7.5k below, but in the floating situation 
you are still going to see the same differences between points in the 
coil, they can just be different relative to ground, but ground is 
arbitrary, is it not? Sorry if I'm missing something, but I'm just a 
student, as yet.

Greg

Tesla list wrote:
> Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 29 Oct 2006 15:27:17 -0500
> From: Mike <mike.marcum@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Doubling NST voltage? (fwd)
>
> The reason most nst's 7500v and up are midpoint grounded is it halves the 
> insulation requirement (lowers cost). To series them this would have to be 
> moved to 1 of the ends, doubling the voltage stress at the free end. Doable, 
> but alot of work and wouldn't last long (potting in oil instead of tar would 
> help). If you really need 18kV from a current limited source take a 15 kV 
> nst and run it at 150v from a  variac. Only trouble with this is right at 
> the edge of core saturation which could be a problem.
>