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Power Factor Correction

Mar 28, 2019

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Power Factor Correction. KW KVA KVAR. Power Factor is the ratio between Power and Apparent Power Motors. Reasons behind P.F corrections. P.F = watts/va Or P.F = P/S. Formula P.F. Power Factor Improvement. Over Correction Individual power factor correction. Power Factor Improvement.

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Power Factor Correction KW KVA KVAR

Power Factor is the ratio between Power and Apparent Power Motors Reasons behind P.F corrections

P.F = watts/va Or P.F = P/S Formula P.F

Power Factor Improvement • Over Correction • Individual power factor correction

Power Factor Improvement • Group power factor correction

centralized automatic power factor correction Utility P.F Correction

Common Types of Capacitors

3 Phase Capacitor

Shunt Reactors Series Reactors Reactors

Edmonton downtown network Calgary downtown network Underground Networks

Reduce electrical costs. Reduce load losses of the distribution system. I²R Loss Increase the system's capacity. Maintain a better voltage regulation on the system. Improves P.F. Benefits of Power Factor Correction

Capacitors hold charges High Quality Capacitors Capacitors in transit Safety

Rules for P.F Calculations • Power input in a load is what the utility see as load • P= KW or W

Power is constant KW or Watts Output power is what the customer sees KW or Watts Rules

Cal. All Power Values @ original P.F 1st SmPmQm Cal. All Power Values @ New P.F (corrected p.f) Using Pm – constant Scor and Qcor or Delivered Rules

Find the Qreq or the Q of the cap required to correct the P.F Qcap = Qm - Qcor Cal Size of Cap’s Xc value Xc = E²/Qcap Rules

Cal the Cap size to μF C=1 x 106 / 2п f Xc Assume 60 Hz Rules

Size the cap for total bank size if required per individual cap divide by 3 Remember Power is always constant Rules Qt = √S² - P²

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POWER FACTOR CORRECTION

Published by Lawrence Cunningham Modified over 6 years ago

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