BIG solid state devices... -primary solid/tube

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi,

At 10:05 PM 7/12/2002 +0000, you wrote:
>
>
>Hello folks
>
>Thanks for all the replies for the solid vs. hollow CU primary question. My 
>thanks to Terry, Dan, Gary and the rest
>“Advanced knowledge in these matters is not needed while wandering the isles 
>of Home Depot ;-))” -Terry”  lol so true…lol.

For the purests, I wonder if conical primaries might have a tiny advantage
over flat primaries due to slighlty less proximity effects?  I imagine any
difference might be super tiny so nothing to worry about for 99% of us ;-)

>
>I was fascinated to find out that DC!! Is used in long distance power 
>transmission! Wow I thought one could not transmit DC more than a few miles. 
>And that this why we all use Tesla’s AC and not Edison’s DC. Wow!

Very long (thousand mile) transmission lines get wild with AC and are hard
to keep stable.  Here is more info if you are interested:

http://www.aapt-dot-org/tpt/pdf/may02/ruby_cover_may02.pdf

A 750k PDF file but it basically tells all.

Here is another nice file that tells much more and shows the DC systems
around the world.

http://www.worldbank-dot-org/html/fpd/em/transmission/technology_abb.pdf

Since the 9/11 attack, information about US power transmission has gotten
pretty hard to find :-(

One very important part of the DC power industry are the solid state
switches they use for the AC/DC DC/AC conversion.  High-voltage,
high-current, fiber optically controlled... 

http://mdk2001.web.cern.ch/mdk2001/Proceedings/Session13/welleman.PDF

There is a very good chance that future Tesla coil solid state spark gaps
will be very similar to these devices!!!  Too expensive at the moment and
they don't show up on ebay ;-))  But keeping an eye on them 8-))  Onyone
interested in solid state spark gaps should check the above link out for sure.

http://global.hitachi-dot-com/Sp/TJ-e/1998/revoct98/r4_109.pdf

Check out the device in figure 2 above.  8kV, 3500 amps, light triggered
:-)))  I dont see it in the DigiKey catalog yet ;-)  Hitachi is making some
very interesting IGBTs!!

http://www.hitachi.co.jp/Div/ise/pdevice/igbt/d-igbt.htm

Most of this comes form DC power transmission and big motor drive
controllers.  Soon we hope to be able to use the technology in Tesla coils
too!  Since my little solid state gap experiment last year, the devices
avaiable now have 4X more power and 4X more current!  But still waiting...

>
>Also I would like to mention also that the “Terry” filter for NST’s that I 
>made from the specs on Terry’s Site works wonders and my NST’s are strong 
>and lively despite my best(worst?) efforts. Last summer I was trying out my 
>first rotary and I cooked my hole coil just about but my Terry filter saved 
>my NST’s so that this 4th I could put on a great show for the clan.  Thank 
>you Terry, you are an asset to the list and all its many coilers.
>

Golly thanks :-))

Cheers,

	Terry



>Read you later
>Josh
>
>