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Re: [TCML] BPS Testing
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
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,
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.
In a message dated 3/10/2008 9:02:44 P.M. US Eastern Standard Time,
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.
Maybe Gary's analysis assumed 140VAC input to the NST?
That should raise the BPS a lot.
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