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RE: [TCML] Re: Primary/Sec. Frequency
Tim,
If your using an RQ gap then 8 turns may cause too many losses, but with a
rotary or two electrode sucker gap it should be ok. Using an LTR cap with
the RQ will mean too few turns though.
I would prefer a bigger 30 inch toroid, but 24 will work, although may not
provide enough protection for the top of the secondary without a corona ring
- suck it and see.
The actual JavaTC output file would have been better; your last post said it
was attached, but as the board doesn't support attachments it needed to have
been cut and pasted from Javatc itself, into the previous posting.
As your given figures are incomplete, I have assumed some bits:-
Sec 6 inch diam = 3 inch radius
1350 turns of 22 gauge
Sec Winding length = 36.45 inches
Sec winding ht2 (top) = 59.45
*** Sec winding bottom = ? (not given)
** therefore =
Sec winding ht1 (bottom) will equal 23 inches (59.45 - 36.45)
Primary 8 turns
inner radius 4.5 inches
*** outer radius = ? (not given)
** but estimated at 9.3 inches (see below # #)
Primary height ? (not given) but most likely 23 inches (bottom of secondary)
----------------
Primary Estimate
o-o-o-o-o-o-o-o
Gives: 7 spaces and 8 turns
(using copper pipe of .25 inch [assumed] x 8 = 2 inches) + (7 spaces x
[guess] 0.4 inch = 2.8 inches)
= 4.8 inches of tube & spacing
So: inner R of 4.5, plus the 4.8 inches above, means outer radius = 9.3
inches
-----------------
# # THE ABOVE WAS ENTERED, BUT WAS CHANGED IN THE OUTPUT FILE BELOW BY THE
JAVATC PROGRAM, BECAUSE IT USED ITS "AUTO_TUNE" FACILITY
------------------
Toroid minor = 8 inches diam
Toroid major = 24 inches
Centre height = 64.95 inches
Voltage rated output = 14.4kV out
Voltage in (not known)
Voltage applied to PT (not known)
drawing 30 amps
Cap size 40 nF
Transformer PT, actual input assumed to be 14.4kv (assumed no Variac
over-voltageing being used)
Assuming you're USA, I guess you'll use the 240v input? as opposed to the
domestic 110v
This all gives a slightly different secondary frequency though (138 against
your 142 kHz):-
(Maybe I missed something - bad night)
The Javatc output using above:
----------------------------------------------------
Secondary Coil Inputs:
----------------------------------------------------
Current Profile = G.PROFILE_LOADED
3 = Radius 1
3 = Radius 2
23 = Height 1
59.45 = Height 2
1350 = Turns
22 = Wire Awg
----------------------------------------------------
Primary Coil Inputs:
----------------------------------------------------
4.5 = Radius 1
9.685 = Radius 2
23 = Height 1
23 = Height 2
8.6412 = Turns
0.25 = Wire Diameter
0.04 = Primary Cap (uF)
30 = Total Lead Length
0.2 = Lead Diameter
----------------------------------------------------
Top Load Inputs:
----------------------------------------------------
Toroid #1: minor=8, major=24, height=64.95, topload
----------------------------------------------------
Secondary Outputs:
----------------------------------------------------
138.26 kHz = Secondary Resonant Frequency
90 deg° = Angle of Secondary
36.45 inch = Length of Winding
37 inch = Turns Per Unit
0.00165 inch = Space Between Turns (edge to edge)
2120.6 ft = Length of Wire
6.08:1 = H/D Aspect Ratio
33.9533 Ohms = DC Resistance
35459 Ohms = Reactance at Resonance
4.12 lbs = Weight of Wire
40.817 mH = Les-Effective Series Inductance
43.441 mH = Lee-Equivalent Energy Inductance
42.51 mH = Ldc-Low Frequency Inductance
32.464 pF = Ces-Effective Shunt Capacitance
30.503 pF = Cee-Equivalent Energy Capacitance
50.629 pF = Cdc-Low Frequency Capacitance
7.67 mils = Skin Depth
24.69 pF = Topload Effective Capacitance
115.1048 Ohms = Effective AC Resistance
308 = Q
----------------------------------------------------
Primary Outputs:
----------------------------------------------------
138.08 kHz = Primary Resonant Frequency
0.13 % high = Percent Detuned
0 deg° = Angle of Primary
32.09 ft = Length of Wire
5.32 mOhms = DC Resistance
0.35 inch = Average spacing between turns (edge to edge)
1.362 inch = Proximity between coils
6.59 inch = Recommended minimum proximity between coils
32.355 µH = Ldc-Low Frequency Inductance
0.03989 µF = Cap size needed with Primary L (reference)
0.861 µH = Lead Length Inductance
140.57 µH = Lm-Mutual Inductance
0.12 k = Coupling Coefficient
0.135 k = Recommended Coupling Coefficient
8.33 = Number of half cycles for energy transfer at K
29.9 µs = Time for total energy transfer (ideal quench time)
----------------------------------------------------
Transformer Inputs:
----------------------------------------------------
240 [volts] = Transformer Rated Input Voltage
1440 [volts] = Transformer Rated Output Voltage
400 [mA] = Transformer Rated Output Current
60 [Hz] = Mains Frequency
250 [volts] = Transformer Applied Voltage
30 [amps] = Transformer Ballast Current
0 [ohms] = Measured Primary Resistance
0 [ohms] = Measured Secondary Resistance
----------------------------------------------------
Transformer Outputs:
----------------------------------------------------
576 [volt*amps] = Rated Transformer VA
3600 [ohms] = Transformer Impedence
1500 [rms volts] = Effective Output Voltage
30 [rms amps] = Effective Transformer Primary Current
5 [rms amps] = Effective Transformer Secondary Current
7500 [volt*amps] = Effective Input VA
0.7368 [uF] = Resonant Cap Size
1.1052 [uF] = Static gap LTR Cap Size
1.9213 [uF] = SRSG LTR Cap Size
27 [uF] = Power Factor Cap Size
2121 [peak volts] = Voltage Across Cap
5303 [peak volts] = Recommended Cap Voltage Rating
0.09 [joules] = Primary Cap Energy
74.6 [peak amps] = Primary Instantaneous Current
125.1 [inch] = Spark Length (JF equation using Resonance Research Corp.
factors)
2.1 [peak amps] = Sec Base Current
With the streamer lengths you can expect to get, you would most likly need
to add a half turn or more onto javatc's primary tap figures, to allow for
streamer loading. (Javatc just matches the frequency, whereas you'll
probably need the primary freq' to be a bit lower than the secondary.)
Others may have additional recomendations
Phil
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Tim Flood
Sent: 21 June 2013 18:59
To: tesla@xxxxxxxxxx
Subject: [TCML] Re: Primary/Sec. Frequency
After much number plugging into JAVATC, I finally got the resonant
frequencies of the primary and secondary to balance. The final numbers are
142.64 KHz and 141.64, respectively with these design parameters:
6" dia. sec. wound with 1350 turns 22 ga., 36.45" winding length or 59.45
Ht. 2
8 turn primary, 4.5" Radius 1
Primary cap - .04 uF
Primary lead length 30" of .2
Toroid - minor dia. 8", major dia. 24", center ht. 64.95, disc ID 0.0"dsc OD
8" disc Ht. 64.95
HV power supply - 14,400 PT. Testing with Jacobs ladder drew a max of 30
amps with a 500' spool of 12 ga.
The above is not what I expected, especially the small number of primary
turns and primary cap size.
Am I headed in the right direction finally? Any comments or suggestions
appreciated - please.
Thanks,
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