Re: IGBT's, pulsed power (was Re: Waveguide TC)

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

I'll bet Greg meant 360 MW...
 >>8000 pulsers at 75 MW pulsed each.. 3 microsecond pulses
 >> Each of the 1000 or so modulator stations needs to generate a
500kV, 2000A, 3uS pulse, at 120BPS.

That's a 1 GW pulse lasting 3 uS , or 3 kJoule/pulse, repeated at 120
pulses/second is 360 kW per modulator
1000 modulators is 360 MW...

Given that the "wall plug efficiency" is probably something around 60-70%,
you're looking at a cool 1/2 Gigawatt to run that baby..
But gosh, that's only 800-900 Amps per phase on the 275 kV line feeding in,
right?

Other high power sources that might be interesting..
Goldstone Deep Space Network has a 400 kW S band (2-3 GHz) transmitter
(continuous, not pulsed) for spacecraft commanding and radar
Arecibo has (or is upgrading to) a 1 MW transmitter (Probably continuous,
since they do planetary imaging)
There's a big radio station just south of the Texas border that has a 1MW+
transmitter (that's not EIRP folks.. that's the power to the feed network)


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 15, 2002 12:34 PM
Subject: Re: IGBT's, pulsed power (was Re: Waveguide TC)


 > Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
 >
 > Hi,
 >
 > 360 MW will light a good sized city.  A 360MW generating station would put
 > a good spot and the map as would the coal strip mine to run it :o))  I
 > "think" Greg meant like 360kW or maybe only 360W  ;-))
 >
 > Cheers,
 >
 >          Terry
 >
 >
 >
 > At 02:24 PM 12/15/2002 -0500, you wrote:
 > >Keep in mind, most facilities using very high powered equipment like this
 > >have additional generators on site
 > >to convert loss energy (such as heat etc...) back into electricity which
 > >they then sell back to the power company.
 > >
 > >Dan
 > >
 > >
 > >
 > >
 > > > 360 MW is still a heap o' juice, though... at $0.10/kWh, it's going to
 > >cost
 > > > $36000 per hour.. Presumably they don't plan to run the thing when
spot
 > > > rates are high...
 > > >
 > > > ----- Original Message -----
 > > > From: "Tesla list" <tesla-at-pupman-dot-com>
 > > > To: <tesla-at-pupman-dot-com>
 > > > Sent: Sunday, December 15, 2002 9:06 AM
 > > > Subject: Re: IGBT's, pulsed power (was Re: Waveguide TC)
 > > >
 > > >
 > > >  > Original poster: "Greg Leyh by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
 > > > <lod-at-pacbell-dot-net>
 > > >  >
 > > >  > Sorry, I didn't denote that the 75MW is the *peak* output
 > > >  > rating of the klystron.
 > > >  > The duty factor here is *extremely* low -- the total site
 > > >  > power should average less than 360MW.
 > > >  >
 > > >  >
 > > >  > >Original poster: "W.R. Langston <blangsto-at-iwvisp-dot-com>
 > > >  > >
 > > >  > >"8000 (or so) 75 MW..." plus significant losses I presume; so,
whose
 > >what
 > > >  > >is powering this set up?
 > > >  > >>
 > > >  > >>
 > > >  > >>SLAC is engaged in the machine design of many subsystems
 > > >  > >>for the Next Linear Collider, including the pulsed power
 > > >  > >>modulators that will feed the 8000 or so 75MW x-band klystrons.
 > > >  >
 > > >  >
 > > >  >
 > > >  >
 > > >  >
 > > >
 > > >
 > > >
 > > >
 > > >
 >
 >
 >