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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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