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Re: [TCML] Paralleling NSTs



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"

I'll add to that. I've run a 9 kV, 60 ma transformer in parallel with a 12 kV, 60 ma and had no problems whatsoever. When the gap fires the voltage across it drops to near zero and the capacitors recharge. Current through both transformers will be the same near short circuit but, if the gap is set wide enough, in addition to current charging the capacitor current will flow from the higher voltage unit into the smaller when the voltage exceeds its open circuit value. So what? Everything is current limited [IF you have the safety gap to prevent series resonance].

Ed

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