Re: New Pole Pig user

Use the circuit for your stove. It'll have 240V, 30A.

As for current limiting, if you can afford it, buy a welder. It makes a really
good inductive limiter. Just short the output leads and use it in series. It's
good to have a resistive limiter as well. That can be a set of heating
elements, or one of a lot of things. I don't really have a lot of experience
here, so look around.

Tesla List wrote:

> Original Poster: Matthew Wenger <m-wenger-at-uiuc.edu>
> I am a new subscriber to this list and I am building my first coil over
> 1KVA. I have been searching the archives for information on using and
> maintaining pole pigs, but I still have a few questions I was hoping
> someone could answer.  I recently obtained two (15KVA and a 10KVA, one is
> my backup) surplus transformers (110V in - 14,400V out) and need to limit
> them to 2.5 or 3KVA for my current coil project.  I have seen many systems
> that are anywhere from 7.5 to 100KVA.  My first question is:  where do
> people get the power to run these large systems?  In order to run my coil I
> will probably have to plug it into plain old 110V plugs and in order to get
> 3KVA that means drawing 27.27 amps, not possible as far as I can tell.  I
> MAY be able to hook up to 220V, but I still would like to know how people
> build large systems at their homes.  I am also concerned about limiting the
> current to my pig.
> As I said earlier, I need to limit the input power to my coil to 3KVA.  I
> would like some suggestions for the best way to do this.  I'd like to use a
> welder to do the job, but I don't know where to get an inexpensive one.  If
> I plug it into a 110V outlet that means It has to limit the draw to 27 amps
> (13A for 220V).  I can find a welder that does that, but it's only 10% duty
> cycle.  What kind of ratings do I need to have for my coil to be on for a
> few minutes at a time?
> I would like to learn how to do accurate calculations for tesla coil
> systems.  I was wondering if there is a way I can find the appropriate
> equations and information to relate these to real systems (ie. calculation
> for impedence of a transformer; how to relate that to the value I need for
> the capacitor, and other such things).  Can anyone suggest any good sources
> for this information?  I would like to try using a synchronous rotary gap
> for this coil and since the components all need to be fairly well matched
> (since the gap speed cannot be adjusted) I need to calculate for and use
> well matched pieces.
> Thanks in advance for any help!
> matthew wenger
> m-wenger-at-uiuc.edu

           --Mr. Postman (Doug Brunner)