Re: Primary Switching [was RE: SSTC hits 66"]

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

Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com> 

Hi,

What's the deal on the monolithic diamond switches? I couldn't pick up much 
information from
google.

Are you still planning on doing the smaller prototype of it?
--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Greg Leyh <lod-at-pacbell-dot-net>
 >
 > Unfortunately ALF cannot operate as elegantly as an OLTC; there will need
 > to be command charging circuitry between the cap banks and the prime power
 > source.
 >
 > As far as settling on a suitable primary drive scheme for ALF, there's
 > still plenty of choices to consider.  A large rotary/static quench gap
 > array was the first choice, but was abandoned a few years ago after the
 > 4.5kV IGBTs nicely proved themselves in 4000A pulsed service -- mores the
 > pity, as the 50' long gap arrays would have been the most visually
 > compelling.  The 6.5kV IGBT silicon is the most attractive approach at
 > present, as LASCRs still have recovery times of 100's of uS. This long
 > recovery time would be problematic, even at a resonant frequency of 6.9kHz.
 > 9.5kV IGBT silicon is now on the horizon as well, though there's the
 > concern it will have unacceptably high forward losses due to the doping
 > used to increase the punchthrough.
 >
 > Monolithic Diamond Switch technology looks *very* promising, but it may be
 > awhile before it's fully mature; they're still in Phase II of SBIR
 > development.  Perhaps by the time ALF is funded, MDS will be the technology
 > of choice.  <emote>
 >
 > And yes, 12kV 3PH would probably be the appropriate feeder class, for
 > either long-haul or onsite generation scenarios.
 >
 >
 >
 > >Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com>
 > > >If I didn't want Steve W. to succeed, I would have suggested
 > > >adding a series
 > > >resistor instead of capacitor <emote>
 > >
 > >ROTFLMAO :D but would Steve have fallen for it...
 > >
 > > >Maybe we should find a way to work together and build an electrum sized
 > > >coil <emote>
 > >
 > >Don't laugh... I reckon it is possible in theory to build a DRSSTC or OLTC
 > >of that size. And some mad b*****d will do it sooner or later. In fact I
 > >heard that Greg Leyh had decided to build his ALF monster twin coil as an
 > >OLTC, using banks of 6.6kV 3000A IGBTs or similar. I suppose the "line" 
he's
 > >running "off" would be a 12kV three-phase feeder ::)
 >
 >
 >
 >
 >


=====
Jimmy