:-)))) Very funny. Yes, the small potentiometer knob is used to fine-tune
the regulation range, with this you only can change the output voltage in
a
range of lets say 200-216 Volts.
I know this because I bought exactly such an unit like yours some years
ago for a big pile of money. I also thought "wow, very cool variac..."
The end of the story was, that there was only a very small (3-phase)
variac with some kVA's inside, which (when I remember corectly)
controlled
in combination with another (small) 3 phase transformer the VERY big
3-phase load-transformer inside the housing. BTW, please don't ask me,
how
this works...
I could be wrong but I'm pretty sure that your unit works in the same
way... At least you should take this into consideration instead of only
rely on size-comparisons with another variacs.
----- Original Message ----- From: "Chris Boden"
<cboden@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, March 29, 2016 6:06 PM
Subject: Re: [TCML] Giant Variac For Sale
The output is adjustable (it's the little knob under the meter) and has a
considerable range. I don't know it's full range as I haven't tested
this
unit. We got them for the stacks, and then leapfrogged past them in our
upgrade cycle in building the new lab. That's why we're selling these.
The variac, pulled from the cabinet, will actually handle a 75kVA load
just fine. I know this because it's a slightly smaller version of the
one
I
use every day in our High Voltage lab as our main power supply. There
are
dozens, if not hundreds of videos of my demonstrating it's use in front
of
thousands of people. You yourself are welcome to come here and measure
the
output capacity and compare it yourself. Of course I suggest you bring a
NIST traceable, calibrated measurement set. If you wish to do this, I
would
be happy to provide a complete camera crew and live audience to publish
your results if you have any doubt as to the veracity of my claims.
It's only a voltage regulator if you keep it intact and use it as such.
Anyone interested on here would likely autopsy it for its component
pieces.
The transformer inside, aside from being "damn big" I know nothing
about.
Though it would make one hell of a boat anchor or a great core for a
reactive ballast.
On Tue, Mar 29, 2016 at 11:25 AM, Teslalabor <teslalabor@xxxxxxxxxxx>
wrote:
Okay! I was little bit confused because of the additional "large
transformer" you mentioned. What I was talking about, are units similar
to
yours, used for automatic "voltage stabilisation". They automatically
adjust line voltage within a range of +/- some percent. These units
consist
of small variacs + big transformer, which takes the load.
But anyway, you should check the namplate carefully. It says INPUT is
166-229 Volts and OUTPUT is fixed at 208 / 120 Volts.
So this means, this unit can NOT regulate Voltage between 0 - 208
Volts!
Is stabilizes the Output Voltage @ 208 Volts, whereas Input voltage can
be
anything between 166-229 Volts.
So this is not a 75kVA Variac Mr. Boden...
----- Original Message ----- From: "Chris Boden" <
cboden@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, March 29, 2016 4:39 PM
Subject: Re: [TCML] Giant Variac For Sale
If you check the pics, this is not a small variac. ;) It's a 6-stack
(triple-double) of the standard big toroids with balancing chokes.
It's
one
size smaller than our 100kVA variac and will certainly handle the
load.
Check the pics, the stack fills up half of that cabinet.
On Tue, Mar 29, 2016 at 3:45 AM, Teslalabor <teslalabor@xxxxxxxxxxx>
wrote:
Nice! I also had such an big automatic voltage regulator some time
ago.
"Problem" is: I don't remember how it works but the variac itself
(which
would be interesting for TC use) is only a relatively small one,
maybe
10kVA or less. The main power (75kVA in your case) comes from the big
standard 3-phase transformer, which is controlled via the small
variac
+
controll transformer.
Maybe you should add an info to your auction, that this is NOT a
75kVA
variac, this could lead to some confusion and you could get some
trouble
otherwise :-)
----- Original Message ----- From: "Chris Boden" <
cboden@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, March 29, 2016 1:21 AM
Subject: [TCML] Giant Variac For Sale
If anyone is interested in a massive 6-stack variac, we have one for
sale.
http://www.ebay.com/itm/222067908245
This happens to also include a solid cabinet with a large
transformer
and
some control circuitry. The unit actually works, but who cares, it's
a
giant 6-stack variac :)
And a matching massive switch as well
http://www.ebay.com/itm/-/322055321777
--
Chris Boden
President
The Geek Group National Science Center
www.thegeekgroup.org
We Build Awesome
--
This email may contain confidential and privileged material for the
sole
use of the intended recipient. Any review or distribution by others
is
strictly prohibited. If you are not the intended recipient please
contact
the sender and delete all copies.
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
--
Chris Boden
President
The Geek Group National Science Center
www.thegeekgroup.org
We Build Awesome
--
This email may contain confidential and privileged material for the
sole
use of the intended recipient. Any review or distribution by others is
strictly prohibited. If you are not the intended recipient please
contact
the sender and delete all copies.
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
--
Chris Boden
President
The Geek Group National Science Center
www.thegeekgroup.org
We Build Awesome
--
This email may contain confidential and privileged material for the sole
use of the intended recipient. Any review or distribution by others is
strictly prohibited. If you are not the intended recipient please
contact
the sender and delete all copies.
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla