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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