Best bet just get a cheap arc welder that’s what I did for my 25kva pole pig found a welder for 125 on Facebook market place.
Sent from my iPhone
> On Dec 17, 2018, at 2:31 PM, Daniel Kunkel <dankunkel@xxxxxxxxx> wrote:
>
> Hello Tesla Coil Friends,
> I have recently acquired a 2kva potential transformer and am eager to get
> it powering my current setup (RIP NST).
>
> For the ballast I opted for a 500ft spool of 12 awg stranded THHN. I then
> used a signal generator and oscilloscope and calculated the inductance to
> be 10.6 mH. The spool also measures .9 ohm of DC resistance. I did the math
> and predicted 29.22 amps. I my jaw hit the floor when my measurements and
> math proved to be spot on when I shorted out the PT!
>
> However, I still need to reduce amp draw down to 22 amps (or a total of
> around 14 mH of ballast), and I was thinking about using an additional
> ballast in series with my 12 awg spool. Right now I am leaning to using the
> (liberated from the tar) 15/30 NST core. I figure I can use the primary
> windings only (omitting the secondary windings and the magnetic shunts).
> But I am unsure about the aspect of core saturation...and if that occurs,
> what will happen in terms of ballasting?
>
> Maybe if I get crazy I will convert the aforementioned NST core setup into
> a magamp! I am sure it will take some research, but I will need to figure
> out how many turns will be needed on the control windings as well as
> voltage and amperage. Heck, maybe I can just stick various sized magnets on
> the core to achieve the right amperage!
>
> ~Dan
> Kansas City area
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