Each coil of this variac is fused at 50A, what was yours at? The makerplate
says 75kVA, and it's Staco....I believe them.
On Tue, Mar 29, 2016 at 1:08 PM, Teslalabor <teslalabor@xxxxxxxxxxx> wrote:
> :-)))) 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
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>>>>>> the sender and delete all copies.
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>>>>>
>>>>
>>>> --
>>>>
>>>> Chris Boden
>>>> President
>>>> The Geek Group National Science Center
>>>> www.thegeekgroup.org
>>>> We Build Awesome
>>>>
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>>>>
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>>
>>
>> --
>>
>> 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
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--
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President
The Geek Group National Science Center
www.thegeekgroup.org
We Build Awesome
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