Re: Measuring Current Spikes on Pole Transformer Primary side

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

Original poster: "Scott Hanson by way of Terry Fritz <teslalist-at-qwest-dot-net>" <huil888-at-surfside-dot-net>

Dan -

The use of a Pearson current monitor would certainly be a very
straightforward way to make measurements of current fluctuations in the AC
input side of the coil.

However, I was specifically asking about the exact test setup Dr. Resonance
was using when HE measured the 50 KVA spikes on HIS system. It wasn't clear
how connecting a storage scope "across the input" would show 50 KVA input
power spikes. If the Dr. did not use a Pearson current monitor, he may have
devised another test setup that is equally useful.

Perhaps he'll be kind enough to share the details of his test setup and the
actual data with us. This might help give more insight into the operating
characteristics of distribution-transformer driven coils.

BTW, my storage scope is a TEK 2430, not the "A" version. If you think the
2430A has a bit of a learning curve, you ought to try the 2430! Layer after
of hidden menu screens to configure the storage options, etc. At least the
2430A's I've used had an "autoset" feature that would allow a one-button
setup as long as any input signal was present.

Regards,
Scott Hanson


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 07, 2003 11:44 AM
Subject: RE: Measuring Current Spikes on Pole Transformer Primary side


 > Original poster: "Mccauley, Daniel H by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 >
 >
 > The test set-up is extremely simple.  All you need is an oscilloscope and
a
 > Pearson current monitor.  Simply put the primary (240VAC side of pole
 > transformer) and monitor with oscilloscope.  Use a storage scope to
capture
 > these high current transients.  You could also repeatedly capture the
 > transient spikes on a regular oscilloscope if you trigger it properly, and
 > with lots of luck!  If you don't have a storage oscilloscope, the
Tektronix
 > 2430A digital oscilloscopes work well although have a bit of a small
 > learning curve.  I have (3) 2430A oscilloscopes if you are interested in
 > purchasing one.  $500.00 each in excellent condition (no probes or manuals
 > though)  They are left over from my business.
 >
 > The Captain
 >
 >
 >
 > "Unless you use a scope across the input to see the "peak" power levels
 > ...... "
 >
 > Dr. R -
 >
 > Can you describe the EXACT test setup that was used to enable you to see
the
 > 40-50 KVA spikes? What instrumentation was used, how was it connected, and
 > what steps were taken to ensure that the test setup was not picking up RFI
 > or EMI from the operating Tesla coil?
 >
 > Regards,
 > Scott Hanson
 >
 >
 >
 >   > Original poster: "Dr. Resonance by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>
 >   >
 >   >
 >   > If you are using a pole xmfr with external reactor you need to realize
 > that
 >   > the pole xmfr, on very short pulsed cycles, will draw as much as 50
kVA
 > for
 >   > very short current spikes.  These are not evident unless you use a
 > storage
 >   > scope connected across the primary side.  The short high power spikes
 > occur
 >   > just as the reactor tries to saturate.  A standard 10 kva pole xmfr
may
 >   > operate at short pulses of 40-50 kVA when used with a standard
 > non-saturable
 >   > reactor design.
 >
 > (snip)
 >   >
 >   >  > Dr. Resonance
 >   >
 >
 >