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Re: Variac Parallel Choke Questions
In a message dated 2/11/00 7:07:07 PM !!!First Boot!!!, tesla-at-pupman-dot-com
writes:
<< Original Poster: Eric Leighton <ELeighton-at-portdiscovery-dot-org>
I have two 10A Powerstats that I plan to run in parallel.
Mechanicals:
Regarding the common shaft, the list consensus (thanks folks) seems to be
that any material of the right size and sturdyness will suit, as long as
it's electrically isolated, so you don't form a closed electrical loop
around the core (thanks Terry). I'm going to go with thick walled stainless
tubing, simply because I have it sitting here on my desk.
Electricals:
Regarding the electrical connections, a search of the archives reveals that
some list members have had success just adjusting the rotor to the same
voltage, without any choke. Any reports of failures or hot-running using
this kind of setup would certainly be appreciated, since this option
certainly is the easiest, if it works ok.
>>
- snip -
Eric,
I have a pair of 10 amp 120 volt variacs that I used for several months when
I was running four 12 kv 30 ma transformers in parallel. I made a mounting
assembly for the two variacs out of 1/8" steel plate welded together and
connected them together with an aluminum shaft. Then I lined up the rotors
and tightened the set screws. Connect them in parallel and have at it. You
could measure the voltage differential between the two common (wiper)
terminals to see how close they are tracking. I never did have any problems
with them getting hot. However, if I would have had some heavy, low loss
chokes handy, I probably would have used them.
Ed Sonderman