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

[Andreas <andreasho@xxxxxxxxxxx>]

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.

--------------------------------------------------
From: "David Speck" <Dave@xxxxxxxxxxxxxxxx>
Sent: Monday, October 25, 2010 8:27 PM
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Can i use an NST as ballast ?

> Andreas,
>
> First,
>
> Measure the primary current on your NST when its output is shorted.  It 
> will probably be 1-10 amps, depending on the rating of the NST.
>
> After you connect the primary of the NST in series with the primary of 
> your potential transformer, the total primary current in the circuit will 
> be somewhat less.  Calculate the primary volt-amps (your line voltage 
> times the limited primary current measured above).  (Volt-amps are not 
> quite the same in an inductive system as watts, but OK for a rough 
> approximation),
>
> Finally, calculate the maximum possible secondary current by dividing the 
> volt-amps value previously determined, by the rated output voltage of the 
> secondary of your potential transformer.
>
> In reality, the actual output current will be less, 'cause you will have a 
> voltage drop across both the primary of the NST and the potential 
> transformer.
>
> As previously suggested, you may need to parallel several NSTs to get 
> sufficient primary current through your potential transformer.  To 
> calculate the primary volt-amps, sum the current draws of each ballast 
> transformer, and multiply the sum by your line voltage.
>
> You could also use shorted microwave oven transformers as ballasts if you 
> have them available.  They may draw 10 - 20 amps each, depending on their 
> ratings.
>
> Dave
>
> On 10/25/2010 1:06 PM, Andreas wrote:
> > Thanks,
> >
> > In a ballpark what current can i expect from the larger HV transformer if 
> > i hook up my NST to the primary for ballast ?
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