Re: Doubling NST voltage? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

(This is just to reinforce others who already answered your question)
Yes, that is exactly the concern.  The inside of the NST secondary winding
are designed for zero volts between them and the core.  The outside of the
secondaries barely have enough insulation to survive, and often don't in TC
service.   Adding another 12 or 15 KV to both inside & outside of the NST
secondaries is a recipe for disaster.  There is no practical, RELIABLE way
to series NSTs.
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, October 30, 2006 7:45 AM
Subject: Re: Doubling NST voltage? (fwd)


> Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 29 Oct 2006 11:37:22 -0800 (PST)
> From: C. Sibley <a37chevy@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Doubling NST voltage? (fwd)
>
> I still don't get it, why would you need an isolation transformer for the
> second transformer?  It seems to me there would be no problem as long as
> the CT of the secondaries were left isolated (i.e. floating).
>
> Is the concern there would be a breakdown between the seconday to primary
> within a transformer?