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Re: [TCML] Paralleling NSTs
Hmm, interesting. This would explain why it worked for my two small
transformers.
Looks like it's not even going to be a big deal now. I ended up depotting
my 12/60. I tried paralleling it with the 15/60 today and while I was
setting up to determine the phase of the outputs the 12/60 developed an
internal short.
On Tue, Jul 1, 2008 at 6:41 PM, Lau, Gary <Gary.Lau@xxxxxx> wrote:
> I agree with Bert. Provided that the insulation capability of the
> lower-voltage unit is not exceeded, each NST will happily supply
> (approximately) its faceplate current rating towards charging the cap to the
> gap breakdown voltage. It doesn't matter that the open-circuit voltages are
> different, no breakers are going to pop. Remember - NST's are perfectly
> happy to drive their rated current into a short circuit as we measure their
> current. That's the beauty of current limiting!
>
> Regards, Gary Lau
> MA, USA
>
> > Phillip Slawinski wrote:
> > > Say I wanted to pair a 12/60 and 2 15/30s. If I set the gap for the
> 12/60
> > > would paralleling them be okay?
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> >
> > Hi Phillip,
> >
> > Unlike distribution transformers, plate transformers, or even MOTS, you
> > can indeed parallel NST's since they're sufficiently shunted to prevent
> > dangerous levels of circulating currents even when open circuit voltages
> > are substantially different. They'll happily play together when phased
> > properly. Because there are circulating currents between the 15 kV and
> > 12 kV NST's, the combined open circuit output voltage of the hybrid
> > combination will lie somewhere between that of a 12 kV and a 15 kV NST.
> > And, since you'll be clamping the maximum voltage via your gap, this
> > should not add any undue stress across the insulation of the 12 kV NST.
> > While not as efficient as using NST' of the same voltage, this approach
> > will indeed work... with NST's or OBIT's.
> >
> > Bert
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