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Re: [TCML] Propeller-Style SRSG eats Tungsten Rods @ 10kVA
Hi,
thanks a lot for the many answers. Yes, I think there are still some
problems with this new system, especially I do not get all the energy
transfered into the secondary, which seems to be the biggest problem. Maybe
we can discuss this tesla a little bit in detail and you can help me getting
into full success. First of all, here you can see details of the
construction:
http://www.youtube.com/watch?v=3pUh3UVZdiE
And here, the TC runs with sparks @ topload, but the Propeller Gap also
begins glowing, smoking and the noise and brightness of the primary sparks
tells me, that the energy transfer is not good:
http://www.youtube.com/watch?v=Abr3rxYUH5o
As you can see, I think for 10kVA input power the sparks should be twice as
long! The specs of the TC:
Input: 0 - 400V 20A from variac
Tank circuit: 4 PT's each 100V / 10000V. Connected in series on low voltage
side and parallel on high voltage side. So if variac is on 100%, every PT
gets 100V and delivers 10kV. They are ballastet on the LV side via a ballast
inductor with air gap, so that the short circuit current without tank
circuit is arround 950mA.
Caps: 2 commercial BOSCH Pulse Caps each 25kV / 500nF in series, giving 50kV
/ 240nF measured.
Gap: Propeller Gap as seen in video. Secondary is 25cm diameter, 1,5m long
and wound with 0,5mm wire + 0,4mm spacewinding.
The following problems: I think the coupling is to tight. Actually the lower
turn of the secondary is 3cm ABOVE the flat primary. When I put it lower, I
get bad racing sparks on the secondary surface.
Should I remove some inner turns of the primary, so that I can put the
secondary lower? Would this prevent the racing sparks?
Next possibility: Is 240nF to much? I have some more of this pulse caps.
Should I put a third one in series? Then I would get 166nF tank capacitance
@ 75kV. This would increase the bang voltage in the tank circuit, of course
I would have to change the firing of the SRSG some ms earlier. Would this
decrease the gap losses and so solve the heating problem? Also with 166nF
the bang-energy would be higher and so the sparks getting longer?
Best Regards
Stefan
----- Original Message -----
From: "Joe Mastroianni" <joe@xxxxxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, October 14, 2010 10:15 PM
Subject: Re: [TCML] Propeller-Style SRSG eats Tungsten Rods @ 10kVA
I recognize the glowing orange circle and the smoke, which in my case
meant more power consumed in the gap than going out the top of the
secondary.
Some tuning fixed that in my case. It wasn't just the power increase.
With the primary tuned, I get no more smoke. Just what I presume is
standard erosion. Now I'm just considering the other issues of gap
quenching that have been mentioned here on the list. I am reengineering
my ARSG to maximize vibrational stability and higher current. Will test
that, hopefully, this weekend.
Joe
This happens to a propeller style 200bps SRSG (3000rpm), if to much power
is applied to its much to small pure tungsten rods. They are 4mm in
diameter. Watch the white smoke, its Tungsten-Oxide! I now have to
replace them by 8mm rods, which should be capable of processing 10kVA
input power.
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