Stefan,
That's indeed some sweet toys that you have there. My prized possession (a far as variacs go) is the 4-stack 1256D Powerstat that is installed into my main power control panel cabinet for my big spark gap driven, Green Monster Tesla coil. I also picked it up "for a little of nothing" off eBay several years ago :-) At 28 amps rating per unit, it should be good paralleled for 112 amps continuous at 0 - 280 volts. At >30 kVA continuous capacity and weighing over 280 lbs (nearly 130 kilos), it's a bit overkill, even for my pole pig driven monster coil, but I love it, as I've never been able to detect notable warming of it above ambient temperature no matter how hard and long I've pushed it. Actually, I don't think my residential electrical service is capable of overworking this beast ;-))
David
Teslalabor <teslalabor@xxxxxxxxxxx> wrote:
>Hi David,
>
>it was "a little of nothing".
>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:
>
>https://www.youtube.com/watch?v=5EKyaMFbCP4
>
>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
>
>https://www.youtube.com/watch?v=798JN1ZgHq4
>
>Regards,
>Stefan
>
>
>----- 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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