RE: Looking for run caps, urgent

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Ted,

"I" have never quite figured out the PFC thing :-))  My big coil needs
200uF of PFC caps as predicted by computer models and proven in real life.
Most of the benefit from PFC caps in my case is from the first 100uF,  The
next 100uF does not add too greatly to the current reduction (a case of
diminishing returns).  You don't want too much PFC capacitance so it is
best to error on the low side.  There are some formula's..., here is mine:

Cpfc = ( Vo x Io ) / ( 2 x pi x f x Vi^2 ) 

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) 


A search of the archives for "Power Factor Correction weirdness" bings up
much "stuff" ;-))

www.pupman-dot-com

Cheers,

	Terry



At 12:53 PM 10/22/2001 -0500, you wrote:
>Jonathan:
>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 enough.
>
>Now here's Jonathan with a figure that meshes with my 165, ie 165 * 2
><because he's using a 120mA figure>= 330.
>So, what's the REAL story?????
>Inquiring minds want to know  :))
>
>
>Safety First
>Ted
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Monday, October 22, 2001 12:33 PM
>To: tesla-at-pupman-dot-com
>Subject: Re: Looking for run caps, urgent
>
>
>Original poster: "Jonathan Peakall by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>
>
>Frank and other whow wondered,
>
>I need 332uf because I have a 15/120 NST, and that's what the java TC
>designer prog. says I need. I sure hope that's right, as it looks like
>getting these caps is gonna be spendy.
>
>Jonathan Peakall
>----- Original Message -----
>From: Tesla list <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Monday, October 22, 2001 12:07 AM
>Subject: Re: Looking for run caps, urgent
>
>
>> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><PsychoticMinds1-at-aol-dot-com>
>>
>>
>>
>>         What do u need such a high uf of run caps for?
>>
>>
>>
>> Frank
>>
>>
>>
>
>