This variac was used in a theatre for dimming nearly hundred light bulbs.
Because the bulbs wasted a lot of (expensive) energy, the whole system was
replaced by LED systems, so the variac was not needed any more. So I took
the opportunity :-)
Yes, this variac is called a "columnar variac". Here in germany we have both
types, also the circular shaped units. I have another columnar variac, which
I will use in my current DC resonant project. This isn't even an
autotransformer, it has separated primary and secondary coils:
And here is another circular shaped high power 3-phase variac in my variac
collection: It makes 0-440V @ 32Amps per phase (24kVA) and of course can
also be pushed far behind this powerlevel
----- Original Message -----
From: "David Rieben" <drieben@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, September 09, 2014 7:08 PM
Subject: Re: [TCML] 30kVA 3-Phase Variac
Wow! Nice find. Did you have to come off a king's ransom to score this
beauty or were your able to get it for "a little of nothing"?
I see it's linear, as opposed to the more common circular shaped style (at
least here in the US they are).
David
On Tuesday, September 9, 2014 6:31 AM, Teslalabor <teslalabor@xxxxxxxxxxx>
wrote:
Hi all,
just wanted to show you my new 0-400V high-power variac, made a video of
it.
It's a motor driven 3-phase variac with a power rating of 30kVA. It has a
nameplate rating of 45A per phase and can make twice the power for 2
minutes
(90Amps per phase, 60kVA).
2x2 Contactors per phase and so it even has balancing chokes between each
pair of contactors on each phase. The contact-surface below them is silver
coated, so it has a dark colour.
Video: https://www.youtube.com/watch?v=U5No4VBoM9A
Regards,
Stefan
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