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

Original poster: "Mike" <induction@xxxxxxxxxxx>

Hi Robert,
Oh yes, I would most certainly use water cooling. More, I would use a Corona ring around and tapered away from the water cooling hose say 10 inches; I would likely use 3/4 inch CU tubing for the primary for the hose non-conductive, wind the isolation hose rated at 1 kV /Ft into a 30 ft hose trap well spaced.
So there is the primary, cooled with distilled water and isolation hose.
So, that takes care of the special requirements, from there it's on to what would you want to configure the rest as using the latest computer modeling. Operating cost is not an issue, there is plenty of 480, 3 phase to run it. That service drop has 7 MCM 500 lines in parallel, per leg, running to it. Don't view it as an induction furnace, just it's 20 kV at 30 amps CCS supply floating across 40 Mfd cap bank for high current pulse delivery. So this is to be a DC Switched coil. Just a chance to play "What if" on a supply one usually can't get onto but here it is, just a fun design exercise.

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, April 17, 2005 2:18 PM
Subject: 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