Re: PFCs

• To: tesla-at-pupman-dot-com
• Subject: Re: PFCs
• From: Neon John <johngd-at-bellsouth-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 24 Oct 1999 10:33:43 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
> 
> Hello All,
> 
> I was wondering,
> 
> Would a bank of paralleled motor-start caps be suitable as a power factor
> correction cap? I I calculated, if memory serves, something like 80uF or
> 90uF for my 12kV 60mA NST. When powering my TC, it blows a 10 amp fuse no
> problem...   ...and I really wish it wouldn't. Since then I could safely
> fuse my variac with the fuse holder built into it.

START caps, which are non-polarized electrolytics, won't work
because they can't handle the current.  But RUN caps, which are oil
filled (typically) paper caps work very nicely.  Common practice to
use them on neon installations so that more transformers can run on
a given branch.  The right amount of capacitance will vary with the
load on the transformer because of the nature of the leakage flux
transformer.  Easy enough to figure out.  Just add capacitance until
the current draw dips low. When it starts back up on leading PF,
back off to the previous value and you've nailed it.

John

-- 
John De Armond
johngdSPAMNOT-at-bellsouth-dot-net
http://neonjohn.4mg-dot-com
Neon John's Custom Neon
Cleveland, TN
"Bendin' Glass 'n Passin' Gas"

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