Neal:1) Definitely not! You would connect the two cores together for the two center transformers, and then you would have to properly phase the 120 VAC Primary inputs so that you see ~4 kV across the two HV terminals. This minimizes the voltage stress between the bottom end of the HV windings, and the core, which is at ground potential. In effect, you create a midpoint (center tap) grounded transformer, just like a standard NST. If phased incorrectly, then the HV outputs will be in parallel, doubling the current available at 2 kV, but not what you want. If you are seriesing 4 or 6 transformers, then you have to disconnect the bottom of the HV windings from the cores, and float the cores of the outside transformers. The outermost two transformers of a 6 MOT stack almost always have to be immersed in oil to prevent secondary winding - to - core breakdown, even if the cores are floated. If you try to go to an 8 MOT stack, then you have to provide isolation transformers for the outermost MOT primaries, as secondary to primary breakdown then becomes a problem. At that point, it's easier to buy a 5 or 10 KVA pole Pig from Dr. Resonance and have everything wrapped up in a nice neat package. You should try to reasonably match the transformer pairs symmetrically for voltage output on either side of ground. If you have pairs of transformers with higher voltages than other pairs, then use the lowest voltage transformer pairs in the center of the stack, and the highest ones on the outside.
HTH, Dave Neal Namowicz wrote:
Hi, Virtually all the mots I have, and have seen, only have the one hv output (ok, a couple have a hi and low output), since the other end is attached to the core. So to series two (or more) together, would I have to1. attach the output of the first to the core of the second? 2. I'm "assuming" that phasing is not an issue like it is with nst's in parallel, but could someone confirm or correct me on this?3. Since the core is "hot", do I just let the cores float, as in not grounding them to house or rf ground? I've looked thru various sites at schematics, but I'm still not clear on this. Thanks for your help, Neal.
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