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Power Factor calculator

 
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Paulvk

Bascom Member



Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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PostPosted: Tue Jul 14, 2020 12:36 pm    Post subject: Power Factor calculator Reply with quote
In AC circuits it is necessary to measure power factor to determine
actual power being used, its normally complicated thing to do.
But there is a old way with meters , resistor and pencil and paper
with help from a calculator to save paper.

Note resistor value only needs to be large enough to get a reasonable reading
its value is not used.

So I thought why not use an AVR even bascom simulator.

I will put together a circuit with an AVR when I get time.

Regards Paul


this is a diagram:



This code provides the power factor from measurements
Cos_phi is the answer

Code:

  $regfile = "m1284pdef.dat"                                ' specify the used micro

Const Xtal = 20000000                                       'use constant for baud rate

$crystal = Xtal                                             ' used crystal frequency
$baud = 9600                                                ' use baud rate
$hwstack = 100
$swstack = 100
$framesize = 150


      Dim Cos_phi As Single
      Dim U1 As Single
       Dim U2 As Single
        Dim U3 As Single
        Dim A1 As Single
         Dim A2 As Single
          Dim A3 As Single
           Dim A4 As Single



        U1 = 230
        U2 = 8
        U3 = 225

'Cos_phi =((u1 * U1) -(u2 * U2) -(u3 * U3)) /(2 * U2 * U3)


        A1 = U1 * U1
        A2 = U2 * U2
        A3 = U3 * U3
       A4 = 2 * U2
        A4 = A4 * U3



           Cos_phi = A1 - A2
            Cos_phi = Cos_phi - A3
            Cos_phi = Cos_phi / A4




Print Cos_phi

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Printpix52

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Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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PostPosted: Wed Jul 15, 2020 2:37 am    Post subject: Reply with quote
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