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*To*: tesla-at-pupman-dot-com*Subject*: RE: What size PFC should i use with my 15/30 NST?*From*: "John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Fri, 01 Sep 2000 11:35:36 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

This equation is incorrect. The Vo and Io are in volt amps. This PFC equation is on several web sites and I am amazed it is still being shown. You need to find the reactive volt amps (VAR). I showed how to do this in a past post that I cannot find now. This is why manufacturers rate their PFC caps in VARs. John Couture ---------------------------- -----Original Message----- From: Tesla list [mailto:tesla-at-pupman-dot-com] Sent: Wednesday, August 30, 2000 8:24 PM To: tesla-at-pupman-dot-com Subject: Re: What size PFC should i use with my 15/30 NST? Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net> Hi John M., Terry, Tesla list wrote: > > Original poster: Terry Fritz <twftesla-at-uswest-dot-net> > > At 10:50 PM 8/29/00 -0500, you wrote: > > > >Hi again, > > > >I do have another question. I would like to put a PFC on my NST but don't > >know what size cap to use. It is a 15/30 stock NST. I'm using a 13nf MMC > >with a 120 bps SRGS (if that makes any differenc). Any recomendations out > >there? If so, is there a formula or rule of thumb to use to determine what > >size PFC to use? > > > >Thanks in advance, > >John M. > > > > I think this is correct. It was posted awhile back and needed about three > typo corrections but this should be right. > > Cpfc = ( Vo x Io ) / ( 2 x pi x f x Vi^2 ) This is correct. I posted a few days ago as Cpfc(uF) = (KVA * 10^9)/(2*pi*f*Vi^2). That was wrong. The 10^9 should be 10^6. Anyway, the value is uF. PFC's due to their size are typically rated in uF. Just wanted to correct my previous blunder. Bart > > > Where > Cpfc = Power factor cap value in Farads > Vo = Rated NST output voltage in volts > Io = Rated NST output current in amps > pi = 3.14159... > f = AC line frequency (50 or 60Hz) > Vi = AC input voltage (120 VAC) > > Cheers, > > Terry

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