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

["McCauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>]

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

Dan
http://www.easternvoltageresearch.com
New CM300 IGBT DRSSTC Kits - COMING SOON!
VTTC Stacatto Driver - Out November 1st, 2010!!!



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Teslalabor
Sent: Tuesday, October 26, 2010 11:19 AM
To: Tesla Coil Mailing List
Subject: EXTERNAL: Re: [TCML] Can i use an NST as ballast ?

Hi Dan,
in which way the 500ft spool does the current-limiting? I think its mostly 
resistive ballasting with only a small amount of inductive ballasting. But 
if you have nothing else availlable, this is a good method indead.

Stefan

----- Original Message ----- 
From: "McCauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, October 26, 2010 2:14 PM
Subject: Re: [TCML] Can i use an NST as ballast ?


> If you are looking for an easy solution to ballast one of the common 
> 14.4kV GE potential transformers, look below.
>
> Terry Blake came up with the great idea of using a 500ft spool of 12AWG 
> stranded wire from Home Depot as the ballast.  When wired in series with 
> the 115VAC input to the potential transformer, it limited current to about 
> 240mA output at 14.4kV.  What a great solution!
>
> You could probably also scale this for use with other transformers 
> accordingly.
>
> Of course, for a pole transformer, the best ballasting solution is a 
> Lincoln Arc-Welder which can be had for very inexpensively on craigs list.
>
> Dan
> http://www.easternvoltageresearch.com
> LED Sequencer Kit Available - VTTC Stacatto Controller COMING SOON!
>
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf 
> Of Andreas
> Sent: Monday, October 25, 2010 5:19 PM
> To: Tesla Coil Mailing List
> Subject: EXTERNAL: Re: [TCML] Can i use an NST as ballast ?
>
> Ok, the power output from my potential transformer will never be more than
> the ballasting NST. So if my NST is rated 500VA i will get 500VA or less
> from my potential transformer. But if i add two 500VA NST:s in parallel i
> get 1000VA or less.
>
> Guess its time to find some MOT:s.
>
> Thansk for the help guys.
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla 

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