Electrical Systems

Power Factor Correction (Single phase Circuit)
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Ii and If are values of current without and with capacitor across the load respectively

C is the value of capacitance required to achieve the desired power factor

Ii   =   Dummy Text If   =   Dummy Text C   =   Dummy Text μ farad


Ii and If are values of line current without and with capacitor across the load respectively

φi and φf are values of phase angles without and with capacitor across the load respectively

P is the power consumed by the load

Qc is the reactive power of the capacitor of capacitance C


I i  =  P V cos φi I f  =  P V cos φf

φf < φi

cos(φf) > cos(φi)

Hence, If < Ii

For given power the line current is reduced if the load reactive power is compensated



Q c  =  P(tan φi -tan φf ) C  =  Q c 2πf   V 2