RE: [TCML] Paralleling NSTs

["Lau, Gary" <Gary.Lau@xxxxxx>]

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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