Power Factor Correction
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Transcript of Power Factor Correction
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Power Factor CorrectionPower Factor Correction
KWKVA
KVAR
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Reasons behind P.F correctionsReasons behind P.F corrections
Power Factor is the ratio between Power and Apparent Power
Motors
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Formula P.FFormula P.F
P.F = watts/va
Or
P.F = P/S
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Power Factor ImprovementPower Factor Improvement
Over Correction Individual power factor correction
Motor or Inductive Load
Power Factor Correction Capacitor
Motor Control Switch
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Power Factor ImprovementPower Factor Improvement
Group power factor correction
Distribution Panel #1
Distribution Panel #2
Distribution Panel #3Power Factor
Correction Capacitors
Capacitor Control Switches
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Utility P.F CorrectionUtility P.F Correction
centralized automatic power factor correction
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Common Types of CapacitorsCommon Types of Capacitors
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3 Phase Capacitor3 Phase Capacitor
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ReactorsReactors
Shunt Reactors
Series Reactors
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Underground NetworksUnderground Networks
Edmonton downtown network Calgary downtown network
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Benefits of Power Factor Benefits of Power Factor CorrectionCorrection
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.
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SafetySafety
Capacitors hold charges
High Quality Capacitors
Capacitors in transit
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Rules for P.F Calculations Rules for P.F Calculations
Power input in a load is what the utility see as load
P= KW or W
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Rules Rules
Power is constant KW or Watts
Output power is what the customer sees KW or Watts
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RulesRules
Cal. All Power Values @ original P.F 1Cal. All Power Values @ original P.F 1stst
SSmm PPmm QQmm
Cal. All Power Values @ New P.F (corrected p.f)Cal. All Power Values @ New P.F (corrected p.f) Using Pm – Using Pm – constantconstant SScorcor and Q and Qcorcor or Delivered or Delivered
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RulesRules
Find the Qreq or the Q of the cap required to correct Find the Qreq or the Q of the cap required to correct the P.Fthe P.F
QQcapcap = Q = Qm m - Q- Qcorcor
Cal Size of Cap’s Xc valueCal Size of Cap’s Xc value Xc = EXc = E²/Qcap²/Qcap
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RulesRules
Cal the Cap size to μF Cal the Cap size to μF C=1 x 10C=1 x 106 6 / 2 / 2пп f Xc f Xc
Assume 60 HzAssume 60 Hz
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RulesRules
Size the cap for total bank size if required per individual Size the cap for total bank size if required per individual cap divide by 3cap divide by 3
Remember Power is Remember Power is alwaysalways constant constant
Qt = √S² - P²