Re: 19 kV MOT stack? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 17 Jul 2007 08:40:32 -0700 (PDT)
From: J. Aaron Holmes <jaholmes@xxxxxxxxxxxxxxxxxx>
To: J. Aaron Holmes <jaholmes@xxxxxxxxxxxxxxxxxx>,
     Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 19 kV MOT stack? (fwd)

And actually, it's even worse; your 8kVA isolation
transformer made of unmodified 15/60 NSTs would need
*two* NSTs for every kVA, right (one forward, one in
reverse)?  So that's actually 16 15/60 NSTs!

--- "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>
wrote:

> :-?
> 
> Straight away, the "19kV from 6 MOTs" bit sets off
> every alarm, but getting back to the more
> fundamental
> "NSTs as isolation transformers" idea:  Realize that
> 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
> NSTs,
> you could just run them all in parallel for 15kV at
> 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
> of
> 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 to
> > parallel a MOT and NST to 
> > get high voltage and current, but I have a
> slightly
> > 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
> current. 
> > 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 something
> > 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
> and
> > 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 you
> > could get 19 kV with 6 
> > MOTs and an NST, and you could float the  MOT
> cores
> > from the secondary to 
> > reduce stress further.  My biggest question is
> would
> > excess current draw 
> > from kill the NST or doesn't it work that way
> (would
> > 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
> > 
> > 
> > 
> > 
> 
>