Bart,
Cool, I could have acquired a HV probe for cheap at an electroncis
store going out of buisness nearby. Too bad I didn't! My NST stats
just changed. I think I killed one of the 12kV coils [maybe think
isn't the right word for this]. Fortunately as I previously mentioned
I depotted a 15/60, so I was able to take the working coil from that.
What do you know, it works. I've still got some issues to deal with.
Like how the lead wire mysteriously kept getting shorter to the point
where I'm at the windings now :(, and I've got some issues grounding
the coil from the 15/60. The transformer worked fine for a little
while while not on TC duty. Once I hook it up to the capacitor bank
the coil with the shortened lead starts arcing to the other windings.
-Phillip
On Mon, Jun 9, 2008 at 7:25 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
Hi Phillip,
Maybe my numbers are the ones that are off. I performed open and short
circuit testing, but also used a HV divider for the high side. This was a
homebrew divider. I'll rerun my test on my modified NST soon and verify. I
have a new HV probe showing up so I can not worry about the HV divider
calibration and all that. If I find it simply doubled the current, that will
be interesting. My voltage is a little lower however as a few layers of
windings had to be removed due to damage.
Anyway, I'll post results when I get probe and redo the measurements.
Take care,
Bart
I have a fluke 335 current meter, and that's about it so I was able to
make some imprecise measurements of the transformer.
Unmodified
Primary 121.6V 6.4A 778.24 VA
Secondary 12000V 60mA 720.00 VA
Power Factor 0.93
Modified
Primary 120.8V 12.4A 1497.92 VA
Secondary 12000V 116mA 1393.07 VA
I can only vouch for the accuracy of the primary measurements. These
measurements were taken with half the shunts removed. Maybe my
numbers are way off?
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