Seriesing NSTs ( was:Re: Small nsts w/ delusions of granduer)

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• Subject: Seriesing NSTs ( was:Re: Small nsts w/ delusions of granduer)
• From: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Tue, 27 Apr 1999 17:31:14 -0600
• Approved: twf-at-verinet-dot-com

Hi Wells all,


>Original Poster: Wells Campbell <wellscampbell-at-erols-dot-com>

Snipola

> There may be a way to hook up two units with 220 and get twice the
>voltage at the same current rating of each individual unit (15 kV -at-
>30mA) but as the secondaries are center-grounded, you would have to
>bias the cases or something, and they would no longer be safe to
>touch...Anyone know for sure?


Correct. Second problem is that the NSTs are designed so that the
insulation sees only one half the total voltage (i.e. 7500V for a 15kV
NST). Even if you were to ground the connection between NST 1
and NST 2 (end leads), you would still overstress the insulation by a
factor of two. (2 x 2 x 1/2 the total voltage across both NSTs). The
cases cannot be grounded (otherwise you would be shorting half of
the total winding). Remember: NSTs arenīt even designed to run at
their rated voltage (for long), so any overstressing of the insulation
is really asking for trouble.


Coiler greets from germany,
Reinhard 

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