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RE: Looking for run caps, urgent
Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
Mike: Thanks a bunch for the extraction!
I'm at the office so I can't quote the original formula I used but it was
from the pupman archives doing a search on PFC.
Obviously 72µF is a major difference than 165µF for a 15/60.
Maybe the best way is to install 72µF and clamp an amp meter on the line
cord then add a tad more and do it again.
All of this will happen after the run at Hangman's. I visit my coil on
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, October 22, 2001 6:03 PM
Subject: Re: Looking for run caps, urgent
Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
There is indeed something amiss. I extracted this from John Couture's site:
The following can be used to correct any LPF NST to about 90% power factor.
C = K1*V*A
C = PFC capacitor in microfarads(UF)V = NST secondary volts
A = NST secondary amperes
K1 = .08 for 120 volts at 60 HZ
K1 = .02 for 240 volts at 60 HZ
Example NST 15000 volts 60 milliamps(ma) 60 Hz
For 120 volts C = .08*15000*.06 = 72 uf
For 240 volts C = .02*15000*.06 = 18 uf
Do not use larger capacities because this could result in leading power
which are undesirerable.
I think there is some serious discrepency for the PFC calculation.
> There seems to be some weirdness here.
> Terry...you might want to jump in.
> I ran the formula using my 15/60 as a model. The answer was 165µF.
> But in an earlier e-note you suggested that only 100µF would be enoug