Re: Balancing chokes

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: <chipford@xxxxxxxxxxxx>

Once again, I stand corrected on my chokes hook-up. I have looked at 
that drawing from superior 10 times from 10 people i'll bet. It made 
absolutley no sense to me until now. I now know that one side of the 
chokes all connect together in series and make no "Electrical 
connection". It is all induced. I also see that the #1 terminal on 
all (3) variacs are connected to (1) line and is also (1) line out 
and terminals (2,4,5) all are connected to the other line in. I don't 
know why that was so difficult. A big thanks to everyone for their 
help on this....

Chip...

P.S. You guessed it. I will work on my schematic and send another 
version of it later...

---- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: Sparktron01@xxxxxxxxxxx
>
> Chip, all
>
> I'm late entering this thread.  I'm helping a fellow experimenter
> build a very large ~25kVA Variac stack
> using 3-1256D's (28A, 240V).  The proper connection diagram for up to
> (8) variacs in parallel using
> balancing chokes is shown in attached URL.
>
> http://www.superiorelectric.com/PDF/Z50pwst.pdf
>
> See page 3 of 8, connection 3 (P/N MB1256D-3P, 0-240VAC, 28kVA, 84A
> @100% DC).  He has a
>   massive Stack of 2 x 8 motorized variacs capable of well over
> 100kVA nameplate, will use
>   equalizing chokes from that assembly.  Motor with traverse 0-100%
> in 30 secs.  Notice the balancing
> chokes are wired on secondary side in series, reflected impedance
> forces current balance on
> entire assembly.  Keep it simple, and smile doing it... :^)
>
> Also on a large Variac stack like this, use a series current limiting
> resistor and contactor ("step start")
> to limit inrush current (could approach 500A on a system like this).
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA. USA
>
>
>   -------------- Original message ----------------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>  > Original poster: <chipford@xxxxxxxxxxxx>
>  >
>  > Could I wrap say 10 or 12 turns of #8 or #10 wire (2 strands) on (3)
>  > of these and use them as balancing chokes for my (3) gang variac? Or
>  > would a toriodal shape be more appropriate? Thanks for any and all
> input...Chip
>  >
>  > http://hot-streamer.com/temp/siiron.jpg
>  >
>  >
>
>