Re: Thanks - Re: Saturable Reactor Ballast from MOT's

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>

Heh, well, I'm glad *some* people are trying this!  I
suggested MOTs because the turns ratio seemed about
right, but in fact I still don't have any MOTs of my
own :P  I bought a few off eBay the other day as soon
as Carl reported success (I'm sure many of you are
wincing at the thought of paying real money for MOTs).
 Unfortunately, I couldn't bring myself to pay for
overnight shipping from NY to WA :((

I really want to see the 240V version working (which I
described in a post earlier today), since I'm
currently using a garbage can full of water as a
ballast for my pig (no joke!).  When my much
anticipated MOTs finally arrive, that is what they'll
be replacing.

You may be ok with two VERY similar MOTs like you're
using, but I'd be scared to try it! :)  Voltage
ratings may differ from open-circuit voltage, voltage
under high load, etc., and you might then have some
rather big AC on your control windings.  "Use at own
risk!"  I purchased eight MOTs having exactly the same
make/model, so I'm hoping to avoid that sort of thing.

Regards,
Aaron, N7OE

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Alex Kardash"
> <voltamp1@xxxxxxxxxxx>
>
> We should congratulate Aaron also, from whom the
> recipe for a
> dual-MOT ballast originated week on hvlist
> (actually, Carl did
> mention that below, but I thought I should point it
> out again for
> posterity's sake :))
>
>
http://www.pupman.com/hvlistarchives/2006/Feb/msg00003.html
>
> Anyway, thanks to both Carl and Aaron for giving me
> something to do
> tonight :D  I just tried this with two *similar*
> MOTs, having the
> same rated voltage and power capacity, and it
> appeared to work out ok
> for a relatively small load (about 3A).
> Unfortunately, I'm an NST
> coiler and hadn't done anything with these MOTs
> until tonight, so I'm
> struggling to find a larger load to play with!
> Where's a third MOT
> when you need one?!  Time to go to eBay, methinks...
>
> Safe TC'ing,
> -Alex
>
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>
> >Original poster: Finn Hammer <f-h@xxxx>
> >
> >Carl,
> >
> >Congratulations, this may be the most important
> >discovery in quite some time.
> >
> >I may be wrong, but from the schematic, it would
> appear that you
> >have the secondaries wired in parallel pairs of
> opposing series, as
> >you describe.
> >However, since the primaries are wired in pairs of
> opposing
> >parallel, it would appear to me, that the effect is
> canseled, and
> >you would in fact get voltage on the
> secondaries/controll windings.
> >Therefore I suggest that the schematic does not
> faithfully record
> >the setup as you describe.
> >Perhaps this is more what is intended?
> >http://home5.inet.tele.dk/f-hammer/satur.jpeg
> >
> >However, a very clever idea. I have never seen
> anyone taking the
> >controll winding out on 2 separate
> >cores.
> >
> >Cheers, Finn Hammer
> >
>