Re: PFC for my NST_2

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Nathan,

Your calculation for the PFC is correct, however, this is only a ballpark
figure. The actual value
will vary from system to system by some degree. There were quite a few
interesting postings this
past year about PFC use that you may wnat to readup on at www.pupman-dot-com.

Take care,
Bart A.

Tesla list wrote:

> Original poster: "Nathan Morris by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <themfam-at-home-dot-com>
>
> Cool people out there,
>
> I was looking at the 'Computer Study of NST Charging Circuits'
> <http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/NSTStudy.htm>http://hot-s
> treamer-dot-com/TeslaCoils/Misc/NSTStudy/NSTStudy.htm  that Terry posted over the
> weekend and it made me think of something.  My 40 HV Russian Military caps
> finally made it in from Lithuania and I have been working on getting my cap
> situation squared away.  I have also been running calculations for the
correct
> PFC cap size to use with my 12/30 NST.  The plate rated VA is 360 for my NST.
> The calculation I found for figuring ballpark PFC size produced a 66uf for my
> PFC.
>
> Observation 1: I noticed (at the above link) that the PFC values for the
listed
> 12/30's were not the same.
>
> Observation 2: All of these tranneys had different tank cap sizes and drew
> different amounts of line current.
>
> Observation 3: The listed VA rating on the NST's in my group (12/30)
STARTED at
> 423 and went up to nearly double the Volt Amp rating on my tranny.
>
> Question 1:  Unless these NST's have been modified, shouldn't the VA
rating be
> the same on all of them?
>
> Question 2: Does the primary cap have any effect on the PFC cap?  (NO..
Right?)
>
> Question 3:  Does a PFC cap of 66uf sound correct for my NST with a 120v
input
> at 60Hz?
>
> Question 4: Other than setting up a phase offset between the E and the I
prior
> to running into the transformer for a more balanced, phase corrected
secondary
> output on my tranny, what is the MAIN benefit of using a PFC.
>
>
>
> --Nate
>
>
>