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Re: [TCML] PFC Question (again)



Hi Bart, John,

IIRC, Kevin Eldredge uses (2) seriesed .376 uFd, 40 kV
maxwell pulse caps (.188 uFd @ 80 kV) for his biggg coil.
That should still be well within the boundaries of STR.

--
David Rieben

-------------- Original message -------------- 
From: bartb <bartb@xxxxxxxxxxxxxxxx> 

> Hi John, 
> 
> Even a small 10kva pig is LTR at 0.3uF which is huge for most coils 
> (primary inductance "and" power across the gap). Have you ever tried a 
> .3uF cap in a coil in a garage? I think Kevin is running a couple pigs 
> and a rotary (no doubt). This is nearing a 0.7uF cap size "if LTR" which 
> is huge! It's possible that a few like Kevin "might" be running LTR, but 
> I think for the majority of pig or PT users (the garage coiler), the cap 
> size is either resonant or STR from a standpoint of cost and energy. 
> 
> My comment is aimed toward the "majority" of pig and pt users. It is an 
> assumption on my part, but it's not hard to look at economy or even 
> energy at the gap to dictate the need. I don't have recent data to 
> support it, but past data does. In this area, I doubt much has changed. 
> The economy really sucks the last few years and I doubt much change has 
> taken place to allow large capacitances or the cost of the gaps needed 
> (or the AC supply current to allow this). Probably a few out there, but 
> I really doubt it is the norm. 
> 
> Take care, 
> Bart 
> 
> FutureT@xxxxxxx wrote: 
> > Bart, Deano, 
> > 
> > PT powered systems run very nicely at 120 bps with resonant or slightly 
> > LTR cap values. They give an excellent power factor. I think Kevin 
> > Eldredge's Biggg Coil is running resonant or LTR also, using dual pig power 
> > and giving 24 foot sparks at 120 bps sync. No PFC is needed for such 
> > systems. Usually running somewhat LTR gives smoother running than 
> > resonant as explained in Morecroft's book of 1924, "Principles of Radio 
> > Communications", (yes, LTR concepts are not new). 
> > 
> > Cheers, 
> > John 
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