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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Marko wrote ...
Hm, I wonder if he's going to use 10kV grid directly for his power supply? (would be far more reasonable for this design than thousands of amps at 240V AC). What kind of permissions does one need to make such a tap?
Marko
Money.
Most large industrial consumers in Denmark have their own substations, this limits problems with that industry to their own land plot and won't affect the rest of the distribution net.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This is Greg Leyh's Advanced Lightning Facility rebranded.
The towers are, as far as I know, OLTCs. My OLTC work was inspired by Greg's papers on the IGBT modulator he designed at SLAC. He won't confirm or deny it, but as far as I know, the twins he showed at Maker Faire are basically the same as my OLTC2, with a bigger brick and a higher charging voltage provided by a stack of Glassman capacitor charging supplies.
I believe the ALF/Lightning Foundry towers will be the same only a lot bigger still, and the switches will be series strings of electric-train-size IGBT bricks.
The original plans I saw on Lod.org called for the facility to have its own substation with a 12kV, 3 phase feed from the power company.
A locomotive would make an excellent power source, but not many of us have a railway to our high voltage test area. If you had to transport it by road, you'd be better just hiring an ordinary generator.
Registered Member #1381
Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74
A"10 stories high" Tesla possibly could have Fres near 50-60Hz. (or even lower) Running it straight from the high voltage lines would make a "few" things "easier" :P
Then again, just imagine how loud this thing could get , 50-100 thunder-claps and Several sonic booms per sec! :P
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Steve McConner wrote ...
This is Greg Leyh's Advanced Lightning Facility rebranded.
The towers are, as far as I know, OLTCs. My OLTC work was inspired by Greg's papers on the IGBT modulator he designed at SLAC. He won't confirm or deny it, but as far as I know, the twins he showed at Maker Faire are basically the same as my OLTC2, with a bigger brick and a higher charging voltage provided by a stack of Glassman capacitor charging supplies.
I believe the ALF/Lightning Foundry towers will be the same only a lot bigger still, and the switches will be series strings of electric-train-size IGBT bricks.
The original plans I saw on Lod.org called for the facility to have its own substation with a 12kV, 3 phase feed from the power company.
A locomotive would make an excellent power source, but not many of us have a railway to our high voltage test area. If you had to transport it by road, you'd be better just hiring an ordinary generator.
Hm, isn't this like extremely outdated TC technology today? After QWC DRSSTC's and all the madness that got invented over years? Hard to imagine why would anyone even want to bother with an OLTC yet.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
a coil that big would take transistors bigger than CM1000 maby 8 of them.the bigest coil to date that I know of is the Golka coil wich was a magnefier. has anybody seen evidence if any thing bigger? A coil that big would require its own indore facility to run it.
Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
I found the parts list on the Kickstarter page. This makes more since now. I thought at first that this was going to be a spark gap type Tesla coil. It would really suck if the IGTBs got fried.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yeah, It's kind of a disappointment that even with all the TC technology advancement this is going to be an OLTC... also controlled by 2MVA variac stacks, talk about being old-fashioned.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Well, with all due respect, Steve hasn't built anything quite that big yet! So he hasn't actually showed that the DRSSTC will scale to Lightning Foundry size. The problem is that as you scale up the size, you need to scale the DC bus voltage too. That can only scale so far because of the difficulty of stacking IGBTs in series, so the number of primary turns gets fewer, and eventually you'll reach a point where it's less than 1, even with the finest 3.3kV IGBTs and a 2kV DC bus. (Edit: Looks like the Lightning Foundry is using 4.5kV parts)
However, seeing as his Gigantor will make maybe a 25 foot spark, I think it outperforms Greg's scale models easily. And, as the thing gets bigger its resonant frequency keeps going down, you get to a point where you can use GTO thyristors instead of IGBTs, and those come in really big voltage and current ratings.
If I were a venture capitalist I would give the money to Arc Attack instead.
If you search the TCML archives, you should find some 10 year old posts from me, Steve and Jimmy, poking fun at Greg Leyh for using the OLTC technology.
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Kickstarter project to build the world's largest TC...
If you had to transport it by road, you'd be better just hiring an ordinary generator.
