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RE: TC Secondary Currents - was ( Experimental Help - Terry?)



Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi John,

You may wish to see the paper at:

http://hot-streamer-dot-com/TeslaCoils/MyPapers/smallar/smallar4.html

The "phase" relationship in a streamer is "messy" as it varies wildly.  If
one is taking arcs to ground, I got in impedance of about 1-3kohm.  For air
streamers, the "average impedance" of 220kOhms = 1pF per foot of arc works
well.

The values of Self, Terminal, and Arc impedance for my big coil are shown at:

http://hot-streamer-dot-com/TeslaCoils/MyCoils/BigCoil/BigCoilSCH.gif

Note that Cterm and Cself have measured resistive components.  These were
determined from ringdown times of isolated parts or the coil.

It would be interesting to make a "test" streamer out of resistors wired
together in the shape of a real streamer.  A three foot long array of
resistors in the shape of a streamer could have a similar impedance to a
real streamer.  Just a test streamer made out of wire may give clues as to
a streamer's impedance.  Of course, I think this has already been worked
out in that big book Bart has.

Cheers,

	Terry


At 08:27 PM 3/2/2002 -0800, you wrote:
>
>To explain the problem further, I regard the ohmic currents as
>(a+j0)(streamers)and the reactive currents as (0+jb)(cap charging). When I
>am getting streamers the current is (a+jb). Or is it (a+jo) and (0+jb) at
>different times of the cycle? With utility currents I can separate the two
>currents easily to find the power factor or I can find the power factor to
>separate the two currents. With Tesla coils I have not been able to do this
>because I have not determined how to measure the high secondary voltage with
>the true phase relations with the (a+j0) or (0+jb) currents.
>
>As I recall Terry was able to create scope curves showing both the current
>and voltage, but the phase difference could not be used to find the separate
>currents. I may be wrong in this assumption. It was also my understanding
>that the displacement current could not be determined.
>
>John Couture
>
>-------------------------------
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Friday, March 01, 2002 9:01 PM
>To: tesla-at-pupman-dot-com
>Subject: Re: TC Secondary Currents - was ( Experimental Help - Terry?)
>
>
>Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
>Tesla list wrote:
>>
>> Original poster: "John H. Couture by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
>> I have done this test many times and often wondered just exactly what kind
>> of current I was measuring. Was the current a reactive current charging
>the
>> toroid and self capacitance of the coil or was it an ohmic current that
>was
>> producing corona and the streamers? And how about the Maxwell displacement
>> currents?
>
>Without breakout, you measure the current that is charging the
>capacitances. With streamers, there is some increase because the
>streamers increase the effective capacitance. With sparks to ground,
>some extra increasing because the sparks discharge the capacitances.
>The displacement current is the return of the current that charges
>the capacitances. It is interrupted at the limits of conductive
>materials in the system, but continues in the ground and nearby
>conductive objects due to the influence of the electric field.
>
>Antonio Carlos M. de Queiroz
>
>
>
>