Re: [TCML] How do they ballast BIG coils?

["Christoph Bohr" <cb@xxxxxxxxxxxxxxx>]

I can't say for sure and I lack the time to read all the
info again right now, but I assumed they slotted the core of the variacs,
thats at least what I would do, however you have to provide some
supports that keep the laminations in place while and after cutting,
otherwise you would end up with some serious "boink" I guess....

Without an airgap it can not work IMHO

A large saturable reactor could be another approach....

I did not know about the ward Leonard thingy, but supports personal
impression of those early days, the had less and menaged quite a lot... ;-)


best regards

Christoph Bohr


> On 9/13/12 6:10 AM, Teslalabor wrote:
>> How is it possible to limit current by the use of a variac? I mean,
>> there is no air gap in the core or such things. Tried it several times
>> in the past on my teslacoils to limit current with a normal variac and I
>> never hat success with that.
>
>
> Perhaps they modified the cores with an air gap..
>
> That's a pretty standard thing, discussed in the list archives, along
> with techniques, warnings, etc.
>
>
>>
>> Stefan
>>
>> ----- Original Message ----- From: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx>
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Sent: Thursday, September 13, 2012 11:28 AM
>> Subject: Re: [TCML] How do they ballast BIG coils?
>>
>>
>>> It's shown on ther very same site, look for controll
>>> cabinet construction, There is an giant stack of variacs,
>>> two of them to be precise, one for voltage, one for current.
>>> 100KVA isn't that much after all, compared to what other industrial
>>> appliances require....
>>>
>
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