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Re: Balancing chokes
Original poster: "huil888" <huil888@xxxxxxxxxxxx>
Oops ..... count me among the mis-informed .....
I went back and dug out my Superior Electric Powerstat catalog
(PVT696) to do some further research on "balancing chokes", with the
following findings:
The 1156D (120V, 50A) and 1256D (240V, 28A) series Powerstats require
the use of the T5587 "choke" for all variations of parallel
connection. This is what I believe to be the 1:1 ratio "buck/boost"
transformer, and is shown schematically as a four-terminal, two
winding "transformer".
None of the smaller variacs (up to the 126/226 series, 120V, 15A and
240V, 7.5A) are shown with any type of parallel connection.
The 136/236 Series (120V, 22A and 240V, 10A) are the smallest units
shown with parallel connections, and require the use of balancing
chokes. For a two-variac setup this choke is shown schematically as
two windings on a common core, with one common terminal, choke P/N
T5000B. For a triple-variac setup, this is shown schematically as
three windings on a common core, with one common terminal, choke
P/N5579B. The wipers of each variac are connected to the free ends of
each choke winding, and the output is taken from the common choke terminal.
It gets even more complicated with the 146/246 Series (120V, 30A and
240V, 15A) powerstats. There are four different chokes for these
units, depending if paralleling 2 or 3 variacs, and if 120V or 240V units:
Choke T6053 is used for two 120V units;
Choke T500B is used for two 240V units;
Choke T6065 is used for three 120V units;
Choke T500B is used for three 240V units.
So, my question to the magnetics gurus is: how can (what appear to
be) simple inductors in series with each variac output enable current
equalization? Is there some trick here with core saturation
("swinging chokes"), or is some other mechanism at work?
Regards,
Scott Hanson
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, November 28, 2006 10:52 AM
Subject: Balancing chokes
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