RE: power factor correction?

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

Original poster: "John H. Couture by way of Terry Fritz <teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


All -

I believe the capacitor 65.6 KVAR in the example shown by Imphotonics is
incorrect. I calculate 29.904 KVAR. Can any coiler verify which is correct?

Given - 400 volts - 135 amps - 50% to 95% PF

Find -  KVAR of PFC capacitor

Answer - Imphtonics - 65.6 KVAR

          JHCouture  - 29.904 KVAR

Click on
  http://www.miramar.sdccd.cc.ca.us/faculty/jcouture/tesla/index.asp?ID=5

    K2 = sin(arc cos(.50) - sin(arc cos(.95) = .55378

    Cap KVAR = K2 x V x A
             = (.55378 x 400 x 135)/1000
             = 29.904

    K1 = (K2 x 10^5/(6.283 x F x V^2
       = .55378 x 10^5/(6.283 x 60 x 400^2)
       = 9.18 x 10^-4

    Cap uf  = K1 x V x A
            = 9.18 x 10^-4 x 400 x 135
            = 49.6 uf

    Amps  = 135 x (.5/.95) = 71.05

The load is 27 KW not 46.77 KW

John Couture


---------------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, July 05, 2003 11:48 PM
To: tesla-at-pupman-dot-com
Subject: Re: power factor correction?


Original poster: "J Dow by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<jdowphotography-at-hotmail-dot-com>

PFC info:
http://www.lmphotonics-dot-com/pwrfact.htm

Ok but what does this mean for the coiler?… it means a cap across your NST
or MOT makes it draw less amps out of the wall.

My 2, 12/60’s like  a 300mf motor start cap.

Good luck
Read you later
Josh