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Re: [TCML] Hot Primary



Depending on the frequency your running at, increasing the cable thickness may not pose any significant improvement due to the skin effect

perhaps try using 2 or 3 x #4 cables in parallel to reduce the effect

again this is dependent on the frequency

BTW water cooled primary would be pretty sweet to see - although you may need to use an oil or pure distilled water

just my $0.02 worth

Regards
Paul

On 19/02/2010 8:11 AM, Dave Leddon wrote:
As I push my DRSSTC into ever higher currents (presently limited to 3000 amps) I am experiencing some significant heating in the primary circuit. I can see that in the future, as we push the envelop with even higher power silicon, we may have to resort to water cooling. Even with 3/4-inch od type L soft copper water pipe (was that ever a bear to bend) the primary becomes too hot to touch after running the coil for one minute. I even changed the interconnecting wires from #4 to #2 welding cable to prevent meltdown, but oddly the larger wire gets just as hot. I wonder if there isn't some sort of rf heating effect unrelated to voltage drop which is generating some of the heat. A related issue which has been bugging me for some time, why are the active primary turns progressively warmer as you move inward toward the secondary? One would think that all turns carry the same current.

Dave Leddon
Pleasanton, CA

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