Power Factor Correction
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Transcript of Power Factor Correction
Power Factor CorrectionPower Factor Correction
KWKVA
KVAR
Reasons behind P.F correctionsReasons behind P.F corrections
Power Factor is the ratio between Power and Apparent Power
Motors
Formula P.FFormula P.F
P.F = watts/va
Or
P.F = P/S
Power Factor ImprovementPower Factor Improvement
Over Correction Individual power factor correction
Motor or Inductive Load
Power Factor Correction Capacitor
Motor Control Switch
Power Factor ImprovementPower Factor Improvement
Group power factor correction
Distribution Panel #1
Distribution Panel #2
Distribution Panel #3Power Factor
Correction Capacitors
Capacitor Control Switches
Utility P.F CorrectionUtility P.F Correction
centralized automatic power factor correction
Common Types of CapacitorsCommon Types of Capacitors
3 Phase Capacitor3 Phase Capacitor
ReactorsReactors
Shunt Reactors
Series Reactors
Underground NetworksUnderground Networks
Edmonton downtown network Calgary downtown network
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.
SafetySafety
Capacitors hold charges
High Quality Capacitors
Capacitors in transit
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
Rules Rules
Power is constant KW or Watts
Output power is what the customer sees KW or Watts
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
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
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
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