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Re: If you had this supply and switch, what would you build?

Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>

Mike: When I had my similar induction furnace the coil was 3/8" copper
tubing water cooled. ^That just was sufficent to take the power and not
melt. I melted one coil and had to replace it . Keep in mind that eats 400
amps of 440v 3 pase power so the light bill is rough.
   Robert   H

> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: Sat, 16 Apr 2005 16:07:23 -0600
> To: tesla@xxxxxxxxxx
> Subject: If you had this supply and switch, what would you build?
> Resent-From: tesla@xxxxxxxxxx
> Resent-Date: Sat, 16 Apr 2005 16:08:39 -0600 (MDT)
> Original poster: "Mike" <induction@xxxxxxxxxxx>
> Hello,
> Given the refinements coils have gone through, I would like to
> know what state of the art design would different people use if they had
> this power supply to use.
> At work is a 20,000 volt at 30 amp DC continious, 480 volt 3 phase
> induction heater. Assume the induction oscillator section is disconnect,
> making the DC supply available.
> Also available is a water cooled switching tube type Y676A/9013 a tetrode,
> designed for fast and high power switching.
> It is rated at 30 Kv standoff and switching 150 amps. If the tube is placed
> in an atmosphere to precent arcing to terminals, it can switch 75 Kv. But
> we will call the switched voltage 20 Kv as that is what is available. The
> tube socket is also in hand. The Filament is 15.5 volts at 215 amps and
> that transformer is available.
> If a cap bank across the 20 kv output of 40 Uf is in place, this should
> provide a decent supply of current peaks, so it should be pretty stiff.
> Given the voltage, we can rule out solid state switching unless you have
> some real nice goodies in a series string with optical gating. This tube
> switch is used in electron accelerators.
> The tube data, grid / plate switching plots are all available where I
> scanned them to at:
> www.hot-streamer.com/mike2004/
> Because this would be 3 Mw system wire size becomes an issue. CW would
> melt down but pulsed, this would be interesting.
> So, 20 kV , 20 amps CCS, pulsed at 150 amps, what would you put it to?
> Mike