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Re: 19 kV MOT stack? (fwd)
---------- Forwarded message ----------
Date: Wed, 18 Jul 2007 09:04:30 -0700 (PDT)
From: J. Aaron Holmes <jaholmes@xxxxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 19 kV MOT stack? (fwd)
Agreed. When you find yourself wondering about wiring
a dozen transformers together, it's time to stand back
and scratch your head a few times!! :-O
As it is, IMO, the eight-MOT stacks out there are
monuments to human persistence more than anything
else. If MOTs are truly all you can get and/or you
have $0, fine. Try 'em. Otherwise, you'll just end
up with something that weighs most of what a small
pole pig would, and yet is always teetering on the
edge of self-destruction (and perhaps destruction of
other things!) due to insulation stresses.
Just curiously: D.C., are you selling out-of-can pole
pigs? If so, that seems like a great option,
considering that so much of the oil volume of the big
cans is wasted on the kind of duty cycles most of us
run TCs at. You could even just buy a pail of Diala
and drop the pig right into it! ;-))
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> ---------- Forwarded message ----------
> Date: Tue, 17 Jul 2007 20:43:15 -0500
> From: resonance <resonance@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: 19 kV MOT stack? (fwd)
> A good cheap 14.4 kV pole xmfr in a walmart plastic
> tank would be more
> efficient and work better for this project.
> Dr. Resonance
> Resonance Research Corp.
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Tuesday, July 17, 2007 11:40 AM
> Subject: Re: 19 kV MOT stack? (fwd)
> > ---------- Forwarded message ----------
> > Date: Tue, 17 Jul 2007 08:35:58 -0700 (PDT)
> > From: J. Aaron Holmes
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: Re: 19 kV MOT stack? (fwd)
> > :-?
> > Straight away, the "19kV from 6 MOTs" bit sets off
> > every alarm, but getting back to the more
> > "NSTs as isolation transformers" idea: Realize
> > your isolation transformers must pass every bit of
> > power that your MOT stacks put out.
> > ......
> > So, if you want 19kV at 500mA from your MOT stack,
> > that's 19kV * 0.5A = 8kVA. 8kVA would be eight or
> > nine 15/60 NSTs. If you had eight or nine 15/60
> > you could just run them all in parallel for 15kV
> > 8kVA, right?? You won't pull much more from a NST
> > than its rated power; the cores are designed to
> > prevent it. If you want, you can pry the NSTs out
> > their cans and modify the cores for more power,
> > enabling you to use fewer of them.
> > MOTs are onerous as it is, but...
> > Cheers,
> > Aaron, N7OE
> > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> >> ---------- Forwarded message ----------
> >> Date: Mon, 16 Jul 2007 22:43:43 -0400
> >> From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> >> To: tesla@xxxxxxxxxx
> >> Subject: 19 kV MOT stack?
> >> Hey everybody.
> >> I read in the archives that somebody tried
> >> parallel a MOT and NST to
> >> get high voltage and current, but I have a
> >> different idea. What if
> >> you took a center tapped MOT or OBIT, to get your
> >> volts up, and put the
> >> outputs to the case of a MOT, to get oober
> >> The first thing to come
> >> to mind is shorting the MOT, but MOT stacks have
> >> been successfully extended
> >> to 8 MOTS, 6 more reliably, and by doing
> >> like this, you could put
> >> the primary at a higher potential, reducing the
> >> chance of an arc over.
> >> http://www.altair.org/projects/MOTstack2.gif
> >> So If you have a 15 kV NST, each side is 7.5 kV
> >> the MOT primary sits at
> >> 2 kV, so the MOT primary is seeing 5.5 kV
> >> difference, just over what a 6
> >> stack would see, and less than an 8 stack. So
> >> could get 19 kV with 6
> >> MOTs and an NST, and you could float the MOT
> >> from the secondary to
> >> reduce stress further. My biggest question is
> >> excess current draw
> >> from kill the NST or doesn't it work that way
> >> the current come from
> >> the MOT, or does it have to be pulled from the
> >> ground in the center of the
> >> NST or OBIT)? Just a thought.
> >> Scott Bogard.
> >> http://liveearth.msn.com