Re: [TCML] Variac ballancing chokes re-visited

[bturner@xxxxxxxx]

Scott -

Good thinking! Makes sense, actually. (Any current imbalance will
distribute across that 3-phase transformer.) I'm gonna remember your
results...!!!

- b





>  My first attempt at balancing 3 16 amp variacs resulted in very
> unbalanced loading. As i recall when I loaded the stack to about 15 amps
> one supplied over 11 amps and the second about 3 and the third less than
> one amp. I checked this with a clamp-on amp meter.  I carefully aligned
> the wipers and checked the voltage at several points in the rotation and
> it was always less than 1 volt difference with the outputs separate. No
> matter how i tried it the balance was always way off.  I had no balancing
> chokes at the time so I tried using all three legs of a 30 volt 40amp 3
> phase transformer. The output terminal being the center of the Y
> connection and leaving the 240 volt primary unconnected. The result was
> all three variacs were within a quarter of an amp of eachother. If you
> don't have any ready made balancing chokes handy it may be worth a try.
>  
> Scott 


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