Re: [TCML] BPS Testing

[FutureT@xxxxxxx]

Hi Bart,
 
In my own NST coils, the current tends to rise by about 50% or so
as I approach 140VAC input compared to the current at 120VAC
input.  The sparks get a lot longer as you can imagine.  I  don't
know if it's due to ferroresonance, but it must be a
characteristic of at least some NST's that causes this.  
My coils used a 120 bps sync gap so that might be a factor, I
don't know.  Maybe you could try applying 140VAC to your 
test NST's to see what happens since you're set up for that now?
The results should be interesting.  Someone had once suggested
that the shunts in the NST may saturate in a non-linear way based
on input voltage.  Actually I thought it was Gary that said that,  but
he didn't mention that lately.  Or maybe it was someone else  that
spoke of that.  I had done a bunch of tests back then but  my
notes seem to be a little confusing unfortunately.  
 
Thanks for doing this important testing.  
 
Cheers,
John
 
 
In a message dated 3/10/2008 9:02:44 P.M. US Eastern Standard Time,  
bartb@xxxxxxxxxxxxxxxx writes:

Hi  John,

There's more to it than variac at full. Gary's system had to be  either 
pulling almost double the amps or there is something else not  
identified. Gary has stated that ferro resonance could be the cause. I  
am not so sure about that. If the NST was saturating, or ungrounded,  
maybe. A TC is certainly loaded, so I doubt loading plays a part. I can  
understand that if there was ferro resonance that the arc could start  
early at the gap, but the energy available in the cap hasn't changed  
(and spark lengths would be poor if so). The cap is a current controlled  
device (ferro resonance or not). I just can't understand how ferro  
resonance would affect much in TC service (but maybe I just don't  
understand ferro resonance well enough). However, if resonant charging  
is occurring, then I can understand the higher bps.

Take  care,
Bart

>
>
> Bart, Gary,
>  
>  Maybe Gary's analysis assumed 140VAC input to the NST?
> That should  raise the BPS a lot.  
>  
>  John
>







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