Re: [TCML] more on paralleling

[Steve Ward <steve.ward@xxxxxxxxx>]

Scott,

My understanding of balancing transformers suggests that you really do
need 1 core per device being balanced.  The balancing is done by
adding or subtracting some small amount of voltage from each variac
output as they are combined to create a voltage source.  So if variac
one outputs 220V while number 2 outputs 222V, the combining
transformers will add one volt to variac 1, and subtract a volt from
variac 2, giving 221V output.  Making up for the voltage difference
between units will then cause them to source relatively equal currents
to the load, and prevent one variac output from driving the other
output (which also will equalize the voltage outputs, in a less
efficient way).  This implies that the voltage across each of the
balancing "chokes" (id call them transformers) is not equal when they
are actually doing something useful.  Hence, you need an independent
core and windings for the system to work as intended.

So based on that understanding, i would have to say you need more than
1 core to do your job.

Steve

On Fri, Dec 7, 2012 at 4:48 AM, mr. scot dingman
<1stbunnykiller@xxxxxxxxx> wrote:
> hey all,
>
> i looked at the diagram again and actually "looked" at it.
> (also found a second old page still active on the web,
> http://bellsouthpwp.net/b/u/bunnykiller/parallel.html )
> see connection2   page 31
>
> Anyway, since each variacs output is wound on separate chokes, and the
> "outputs" from the chokes are all tied together, the second winding (
> paralleling winding) runs in series with all 4 chokes, I guess this is
> sharing the current somehow between all the chokes. My new thoughts are, if
> I use a single core, wind all 4 outputs on it, it should be the same. And I
> wont need to put a second paralleling winding on it either ( if i did it
> would end up being a short circuit )
> The core I intend to use will be an old core from a previous 1256D
> meltdown, the core is undamaged but the original windings are history,
> so... there is plenty of room for choke wire...
>
> thoughts and ideas on this subject are welcome...
>
> Scot D
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