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

[David Speck <Dave@xxxxxxxxxxxxxxxx>]

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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