Re: [TCML] PFC Question (again)

[FutureT@xxxxxxx]

In a message dated 5/26/2008 9:02:15 P.M. US Eastern Standard Time,  
bartb@xxxxxxxxxxxxxxxx writes:

>But, 
>you say that you are surprised that coilers haven't  done tests in this 
>area. I'm not so surprised myself. This area is not  well known. To some 
>degree it is, but little has been done regarding  testing. 
 
Bart,
 
Well the reason I said I'm surprised more testing wasn't done is
precisely because not much is known.  There's always coilers  who
"want to know", so it would make sense for folks to do testing in
this area.  Maybe more tests will be done soon. 
 
>I run STR with a 10kva pig, but I also use a variable current  ballast. I 
>have both voltage and current control for any coil using my  control 
>cabinet, but there is a limit. Two 4th of July's ago I smoked  my variac 
>ballast. No short (very lucky) so I was able to clean up and  continue to 
>use. However, I am more cautious these days. I can't go  over 7 kva 
>without ballast issues.


In one test I ran a PT powered 600 watt ballasted 120 bps coil.   Using
my homemade ballast the coil drew 600 watts, but using a 20  amp
variac as a ballast, the coil drew 1200 watts.  That's when Dr.  Resonance
suggested cutting a slot in the variac to prevent saturation of the  core.
I think with STR operation the slotting may not quite as  important?  It
may be very important at 120 bps.  (I'm not sure if every 120 bps  coil will
behave the same in this sense.)  Slotting seemed to be very  much needed
because only a few turns of the  variac were needed at 120 bps.  
 
Cheers,
John


>Take care,
>Bart








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