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Re: [TCML] 3000W Halogen Dummy Load WAS: Coil V4 fail (additional)

Hi Stefan,
It sounds like your DC power supply may be sagging under load, thereby reducing your tank cap voltage, bang size, and power throughput. This condition is worsened by current limiting from the ballast inductor that is in series with your HV transformer, since it will limit the peak recharging current to your DC power supply storage capacitor. Eliminating (or substantially reducing) the ballast inductance should help. Increasing the DC storage capacitor size may also help reduce sagging when operating at higher break rates, since your storage cap will only be recharged during line peaks (100 PPS from a single-phase source), but you'll be drawing energy from your DC storage cap at twice that rate. 

Bert
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Teslalabor wrote:

Hi,

yes I also used the ballast correction factor, but as already said the
current was much to less, don't know if the used current meters are the
reason for this. I have the feeling the coil runs with only 3kW real
power instead of the 5kW I wanted. Don't know if this comparision is ok,
but the 3kW halogen dummy load in my first tests was glowing at "normal"
brightness as it would have glowed in normal 230V mode, so another
indicator for only 3kW. I think the sparks were okay for 3kW (arround
1,8meters) but if there would be 5kW they should be longer.

Regards
Stefan


----- Original Message ----- From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, December 22, 2010 1:20 PM
Subject: RE: [TCML] 3000W Halogen Dummy Load WAS: Coil V4 fail (additional)



Stephan et al
As I understand because of power factor issues, unless you have a true
power
meter, it means the readings are always low. I #think# a moving iron
meter
reads correct, not sure though. On mine I just read the variacs input
current with a moving coil meter but that always reads low compared to
his
PSpice file for a simulation. I base all my power estimates on what
PSpice
gives me. The current drawn by a shorted transformer with just the
ballast
to limit the current is always different when you add in the tank
circuit if
you have a SRSG.
This all assumes you have followed his method and allowed what he
calls his
'ballast correction factor' .
The charging method only really laying down the foundations of the coil.
The actual performance being dependant on lots of other things, but
you say
that part is good.

Estimating the power and actually measuring are a thing I've long
meant to
look into more. I wonder on the suitability of current transformers
for this
matter - anyone?

Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf
Of Teslalabor
Sent: 21 December 2010 14:01
To: Tesla Coil Mailing List
Subject: Re: [TCML] 3000W Halogen Dummy Load WAS: Coil V4 fail
(additional)

Hi Phil,

today I tested the coil. It seems to run good but the power is much to
less
and not what I calculated.
I was going for 5kW real power using Burnett's resonant charging design
method. So the current on the primary side (variac at full power)
should be
arround 25A. But when running the coil only 15A are flowing.
When connecting only the ballast inductor (31mH) to the variac, 25A are
flowing.
So why are only 15A when running the teslacoil?

Stefan

----- Original Message -----
From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, November 24, 2010 10:55 AM
Subject: RE: [TCML] 3000W Halogen Dummy Load WAS: Coil V4 fail
(additional)



It is a vast improvement over the previous arrangement, it will be
interesting to see how the coil performs.

Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf
Of Teslalabor
Sent: 21 November 2010 12:11
To: Tesla Coil Mailing List
Subject: [TCML] 3000W Halogen Dummy Load WAS: Coil V4 fail (additional)

Hi Phil, others,

before I will do a full scale test with secondary in place, I
performed a
test with a big 3000W dummy load in place of the primary. The dummy load
consists of 6 halogen bulbs each 230V / 500W connected in series. I
made a
video of the dummy test:

http://www.youtube.com/watch?v=pp3M2KNXbrs

The system seems to run very smooth, Richie's resonant charging design
works
pretty well. Compare it to an earlier video, where I used much to high
primary capacitance (240nF) and other bad parameters and got terifying
glowing electrodes:

http://www.youtube.com/watch?v=O84SI50g0NY

as you can see I also did some changes @ the SRSG but the electrode
diameter
is the same (4mm tungsten).

Will tell you the results (+ video) when testing with secondary in
place.

Best Regards
Stefan

----- Original Message -----
From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Saturday, November 06, 2010 8:09 PM
Subject: RE: [TCML] Coil V4 fail (additional)



Stephan,

Your specs are similar to mine.

I compared a recent video where I have resonant capacitor (101nF) cap
against an earlier run with the same ballast setting (20 mH) but
where it
was just below the resonant value with a 72nF capacitor.

You can see the difference between the two. (Both are 200bps SRSG
with a
Freau controller)

How much is down to making the system being resonant @ 200bps and just
how
much is just down to a larger cap, it is hard to say of course.



My earlier 72nF setup was almost resonant:
http://www.youtube.com/watch?v=dZc9mUOJh9Y



The latest 101nF setup is resonant (@ 200bps on 50Hz ):
http://www.youtube.com/watch?v=DBG_0Xv7J3s





Phil









-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf
Of Teslalabor
Sent: 06 November 2010 14:57
To: Tesla Coil Mailing List
Subject: Re: [TCML] Coil V4 fail (additional)



Phil,

okay thanks a lot. Will post the results + video of the coil running.
Just
have to put the parts together. By the way, the specs of the tank
circuit
are (resulting from the resonant charging design procedure):



Input: 0-240V fed via variac

Power coil will process: 5kW

200bps SRSG

Primary Voltage: 10kV from PT's

heavy adjustable air gapped inductor 20mH ( if "I" part of core
completely

removed) ... >100mH; no saturation effects), adjusted to 30,8mH 98nF
Tank
Cap (commercial 25kV BOSCH pulse cap) - REMEMBER, I first used 240nF
and
got
badly glowing electrodes @ my SRSG!



It's the first system I designed this way - all my earlier systems I
did
the
way "take some parts and see what happens". So I am absolutely longing
what
performance this system will have.



Best Regards

Stefan



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