[TCML] Hot Primary

[Paul Bidmead]

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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