Re: [TCML] BPS Testing

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi John,

Ok, I'll hook up the variac next weekend and run at 140 Vac. That should 
be a good test. The core will near saturation, so maybe ferro resonance 
will show up. My prediction is 82 bps as opposed to the 70 bps at 
120Vac. So, I expect to measure around 95 bps (reality) if everything 
scales. If I measure something much greater, then maybe we have some 
instances of saturation occurring. If so, this would support ferro 
resonance.

I know what you mean about notes. I've done many tests, usually to 
provide some input to an email question, but I haven't always taken good 
deciphering notes for myself. Sometimes I read what I wrote, and I'm 
still confused as to what I was actually doing. I guess something I need 
to get better at.

Thanks for the idea,
Bart

FutureT@xxxxxxx wrote:
>  
> 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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