Power Factor Correction

J.B. Wood · 2020-03-09T11:38:37+00:00

Hello, all. I'm an EE by trade but have never worked with, nor designed, AC power distribution systems. On overhead medium-voltage (say up to 69 kV) lines one often sees banks of subject capacitors on the utility pole. While I certainly understand why they are used, I've never understood how engineers decide exactly where to place them along the distribution line. Is this done by first making a power factor measurement at the candidate utility pole location or by just guestimating based upon expected downstream inductively reactive loads? Thanks for your reply and comment. Sincerely,

Mar 09, 2020 Last reply: 5 years ago 21 Replies

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I?m thinking about my $25 E, H signal level meter but it?s only 10kHz to 3GHz and measures in V/m and uT/m

Using a dipole antenna loaded with an LC filter tuned to swamp any RF abov e 10kHz and a large loop antenna with the same, I think it?s possib le to measure power factor remotely then aggregate the field measurements t o compare with the power studies to determine which load networks will bene fit from a low Q Cap loading on a transmission line modelled on Falstad? ??s with a delay line network simulation.

AC motors usually draw a bit more than 5 times the rated load current on st art up which when unloaded means it?s about 50 times with zero load , so effectively it?s 98% VAR, or 2% of then determine the cyclica l nature of motor work during the day and the distribution of loads from st eady, variable , start-stop, arc welding , old fashioned HPS street lamps a nd determine which of loads will save on maintenance costs with some sort o f threshold model.

The best tools are the one you know how to use and you will wish you knew M B Hydro?s PSTools (?). It I know Falstad?s web simulator re ally well is capable of good simulations on transmission lines in time or s pectral domain.

Anyways if there was a PO, I could design my idea for a non-contact EH PF t ester.

s only 10kHz to 3GHz and measures in V/m and uT/m

ve 10kHz and a large loop antenna with the same, I think it?s possi ble to measure power factor remotely then aggregate the field measurements to compare with the power studies to determine which load networks will ben efit from a low Q Cap loading on a transmission line modelled on Falstad? ??s with a delay line network simulation.

start up which when unloaded means it?s about 50 times with zero lo ad , so effectively it?s 98% VAR, or 2% of then determine the cycli cal nature of motor work during the day and the distribution of loads from steady, variable , start-stop, arc welding , old fashioned HPS street lamps and determine which of loads will save on maintenance costs with some sort of threshold model.

MB Hydro?s PSTools (?). It I know Falstad?s web simulator really well is capable of good simulations on transmission lines in time or spectral domain.

Brain fart on the motor?s PF from startup to no load to full load , that?s just the real power change , anyways a portable DSO in XY m ode for HE fields , calibrated ought to measure the average 3 phase imbalan ce which may be accurate enuf to estimate the sum with a near field non con tact set of measurements, measured in three 1km spacing where the phases ro tate.

Power Factor Correction

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