RE: NST TEST GRAPHS (was NST power test)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Does any of this testing show that a simple transformer model (leakage 
reactance, series resistance, magnetizing inductance, loss resistance) 
doesn't adequately describe the NST operating in it's linear (non 
saturated) regime?

I don't know that the intersection point is truly where power in=power 
out... it IS where apparent power (VA) is equal, but given that you've got 
a reactive load, it doesn't say much about real power.

When the secondary VA is greater than the primary VA, it just means that 
there is reactive power circulating in circuit formed by the secondary 
leakage inductance, resistance, and the external capacitor.  In fact, it's 
a good indication of resonant rise in the secondary, since that would 
nicely explain it.

0.01 uF at 60 Hz would be about +j265K ohms...
7.5kV open circuit with 30 mA short circuit output current would imply that 
the leakage inductance has a reactance of about -j250K... (neglecting the 
iron and copper losses, which are probably around 5-10%)


So, the 0.01 uF case is pretty darn close to resonant.  What was the 
voltage across the capacitor in this case?


At 04:49 PM 1/17/2003 -0700, you wrote:
>Original poster: "John H. Couture by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
>
>Terry -
>
>I was pleased to hear you are doing similar NST tests that I have done. So
>far I have not been able to verify my NST test results. Apparently this is
>new territory for most coilers. I was surprised that you did not find that
>the cap load on your NST did not show a VA output greater than the VA input.
>I believe this was due to your test setup. I suggest you change your
>schematic by eliminating the resistance and omitting the ground connection
>to the caps. When you add resistance it should be in series with the cap.
>
>Your NST should be a HPF type with a built-in cap, not the added on caps.
>The KV voltmeter should be an electrostatic type. Only 120 VAC for the NST
>input is needed. Varying this voltage is not required as in Hull's tests.
>These changes should give you graphs similar to the ones I obtained. If
>possible, measure the input volts (120), amps, watts, and calc the VA and
>power factor. Measure the output KV (electrostatic), milliamps, and calc the
>VA, and watts. Make graphs with load (uf, ohms) as X axis and VA, or other
>secondary variable as Y axis.
>
>One of the many graphs I made is shown at
>
>     http://www.mgte-dot-com/tesla/rc-neon-curve.pdf
>
>An Acrobat printout gives a clearer view than the screen. This graph shows
>the VA input and VA output curves when a capacitance load on the NST is
>varied from .002 to .014 uf (X axis) and the Y axis is 40 to 200 volt amps.
>Note that these curves intersect at an important point on the graph. This
>condition is when the Power Input exactly equals the Power Output. Do not
>confuse power with energy because this condition with energy would have to
>include losses.
>
>My other tests were with combinations of both capacitors and resistors. The
>graphs all showed non linear curves of varying shapes. Sometimes the curves
>intersect and sometimes they do not. The intersect points are very important
>because they appear to be optimum operating conditions with maximum overall
>efficiency for a particular type of load. I believe this is something new to
>coilers. There is much more testing of this type to do.
>
>John Couture
>
>------------------------------
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Wednesday, January 15, 2003 8:15 PM
>To: tesla-at-pupman-dot-com
>Subject: RE: NST power test
>
>
>Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
>
>Hi John,
>
>I have been doing tests too :-))  Although still very rough draft like, it
>is at:
>
>http://hot-streamer-dot-com/temp/NSTva.html
>
>It is not done yet, but I thought I would mention it now for
>suggestions.  I could only get 260VA out of a 360VA NST using just
>caps.  Any ideas are welcome ;-))  It is all set up and just waiting.
>
>Cheers,
>
>          Terry
>
>At 11:43 AM 1/15/2003 -0500, you wrote:
>
> >To All -
>
>--------------------   big snip  ------------------