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RE: Greg's MOT New Stack (artwork, ballast explanation, etc.)
Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
> Is anybody ballasting their MOT supplies? I'm not
Yes. I am.
> sure I understand the
> necessity of the huge capacitances. Problems with
Because I'm running four (4) MOTs capable of drawing
over 6kva from a single 20 Amp outlet. Without
ballasting, the breaker trips within seconds, which is
a good thing, since the light-duty power cord would
probably melt within a minute if the breaker didn't
The HV-side ballast capacitors are not huge. They are
actually kind of small--only .97uF/2200wvac each. I
run 6, 8, or 10 of them in series with the high
voltage circuit to limit the current IAW the
capacitive reactance formula.
> power arcing? Perhaps MOT
> power is stiffer than even Pole distro xfmr power? I
Not likely. A pole transformer can run at two or three
times its rated load without breaking a sweat. A used
5kva pole pig can beat up a MOT stack with one bushing
tied behind its back.
> would think some series
> resistance on the HV side would help.
Help with what?
> Dave H
> Andy C.
> Internet Homepage: http://users.rcn-dot-com/tcobaugh/
Gregory R. Hunter