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Re: [TCML] BPS Testing

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,

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

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