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Re: PFC Question

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Mike,

Excellent question.

In my opinion, the reason has to do with cost of caps and super gaps, initially. As an example, I'll use my old pig coil. It has changed dimensions through the years (and no longer exist as Tesla coil). The last configuration was approximately 12.75" x 46", 1070 turns of #18, and with my 10kva pig, 12.4j max bang energy as I ran 0.06uF at near 9 turns with the top load I used. For this coil and my pig, if I were to go LTR (and we can be certain it would be LTR for an RSG), then my cap would calculate to 0.333uF. Thus, my max bang energy would be 69j, Yipes!!!

So, now you must consider:

1) Can the secondary take it? (all of sudden, I have a vision of smoke and fire!)
2) What type of gap would be required to handle that kind of energy? (a really, really, BIG ONE!)
3) How much would the caps and all cost me? ($$ I feel sick just thinking about it)

These are a few of the many issues to consider, but they are real. To put it simply, it's not in the arena for the garage coiler, and thus, we "typically" run in STR mode.

Take care,
Bart

Tesla list wrote:

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

Why is it that the majority of big pig coils limit the tank cap to 0.1 ?
What if one used an LTR ?
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, November 04, 2005 12:52 PM
Subject: Re: PFC Question


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi All,
>
> Tesla list wrote:
>
> >Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> >
> >Hi Ed,
> >
> >The PFC caps only correct for inductive loads.  If you are running
> >the pig with a STR Cp value, then  PFC caps wont work cause the load
> >presented to the variac will be capacitive (maybe a PFC inductor
> >will help here).
>
> Gerry is correct. Most pig transformers run in STR mode. They don't
> have to, but it is typical to run a 0.1uF or less, and in these pig
> powered coils, a PFC cap will not help. But of course, on NST's and
> even some PT's, a PFC cap will be helpful. Most pig coilers don't use
> PFC caps that I'm aware of.
>
> Take care,
> Bart
>
>
>