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Re: [TCML] Can i use an NST as ballast ?



McCauley, Daniel H wrote:
It is indeed inductive ballasting.
If you measure the 500ft spool of wire you get about 0.9 ohms resistance and 10.50mH inductance.  Current limits to about 25A.

Terry Blake was the first to use this type of ballasting for a 14.4kV Potential Transformer.
You can see more of his measurements here on this ballast.

http://www.tb3.com/tesla/mrun/index.html

And, if you need to cool it, you can throw it in a bucket of water. Thermal time constant is pretty long, though...the water can't get to the inner part of the "winding"

But, 25Amps at 1 ohm is only 25W, and a spool is pretty massive.

you could use salt and ice and precool the spool to reduce the resistive losses, even.
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