calculation for power factor


by Idea04
Tags: calculation, factor, power
Idea04
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#1
Jan20-14, 11:42 AM
P: 185
I'm trying to calculate the power factor of a three phase synchronous generator

torque angle = arctan^-1 (impedance)
(sin torque angle/ current x voltage)
90 - torque angle - sin = XYZ
power factor is cosine XYZ

Is this the correct calculation to use?
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tiny-tim
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#2
Jan22-14, 05:36 AM
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Hi Idea04!
Quote Quote by Idea04 View Post
torque angle = arctan^-1 (impedance)
i think i know what you mean, but that's not how to write it

it's arctan or tan-1, not arctan-1

and they are for real numbers, not complex numbers, you need arg for that

impedance is a complex number, and Z = X + iY = |Z|e

φ = arctan(Y/X) = tan-1 Y/X = arg(impedance)
(sin torque angle/ current x voltage)
90 - torque angle - sin = XYZ
power factor is cosine XYZ
sorry, i don't understand this eg what is the angle XYZ ?
add the three complex voltages (as complex numbers), then find the arg


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