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Re: [TCML] 35 KVA Vacuum Tube Tesla Coil
Hi Roger,
First of all, kudos on a very impressive VTTC. ;^))
As for the 170 amps @ 230 volts, I tend to agree with
Phil, in that maybe you ammeter and PF issues could be
distorting your readings. If you are actually drawing THAT
much power, I'd hate to be your neighbor(s) who shares
your distribution transformer, as that would almost certainly
cause a noticable dimming of the their lights, unless
it is also a very "stiff" transformer ;^) My local electrical
utility sometimes places two average sized residential homes
on a single 15 kVA transformer but usually upgrades to a 25
kVA unit for two and almost certainly for a third customer hookup.
Most subdivisions will have about 5 or 6 customers to a 50 kVA
unit. I do realize that the "nameplate" rating of distribution transfor-
mers is at 100% duty cycle, with a 65*C temperature rise, so
they can certainly momentarily put out several times their rating.
Now that it's summer here in the south, central AC units, which are
very power hungry, run almost round the clock, so the service trans-
former has additional loading on it from every customer who happens
to like his or her house cooler than 95*F inside, in addition to notably
higher ambient temperatures to operate in.
I would have to think that a little 5 kVA unit must be really straining
to put out 35 kVA, though ;^0
David
----- Original Message -----
From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, July 06, 2011 8:22 AM
Subject: RE: [TCML] 35 KVA Vacuum Tube Tesla Coil
Roger wrote>>
"I found it hard to believe myself but I'm pulling 170 amps at 230 Volts.
After a few runs the transformer gets warm but not smoking hot."
"Smoking" is the word I was thinking of actually. In the video at around 2
minutes in where you focus on the transformer, the tranny's input lead
coming in from the right hand side looks like ordinary flex (13 / 15 amp)
I
would have thought that 170 amps would melt the insulation as quick as you
could look at it. Maybe your ammeter and PF issues are distorting things?
It
has to be good news for you though if that's the case.
Regards
Phil Tuck
www.hvtesla.com
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Roger Smith
Sent: 06 July 2011 10:42
To: Tesla Coil Mailing List
Subject: Re: [TCML] 35 KVA Vacuum Tube Tesla Coil
On 7/5/2011 3:50 AM, Phil Tuck wrote:
Roger,
It's a change to see a nice sized discharge from a valve coil, but I
have just realised that you said 35 kvA and not 3 and a half kvA! That
means you are pushing the tranny by a factor of 7. Is this the reason
you kept the run-time relatively short, or is that for the valve's sake?
The actual physical size of the tranny looks relatively small against
my own 5kVA core (which is 16 inches high and weighs 90 pounds) and I
am surprised the core cross section isn't completely saturated.
The fact it is out of its oil as well (mainly for cooling rather than
insulation in this instance) certainly makes it a well-built tranny to
my mind.
Regards
Phil Tuck
www.hvtesla.com
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Roger Smith
Sent: 04 July 2011 10:46
To: Tesla Coil Mailing List
Subject: [TCML] 35 KVA Vacuum Tube Tesla Coil
I got a hold of a big ceramic triode (3cx10000a3) a few years
ago and I finally built a tube coil with it. It is powered by a 5 KVA
pole transformer at up to 35 KVA and I am now getting 50" fat bushy
sparks.
Here is a link to the video on it
http://www.youtube.com/watch?v=B8536fYHvGM&feature=feedlik
<http://www.youtube.com/watch?v=B8536fYHvGM&feature=feedlik> I
haven't seen any other VTTCs like it so It's hard for me jug the
efficiency of it. Any suggestions are welcome.
Roger
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Hi Phil , I found it hard to believe myself but I'm pulling 170 amps
at 230 Volts. After a few runs the transformer gets warm but not
smoking hot.
Roger
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