Learn how to calculate Power Factor Correction - Tutorial

How to calculate Power Factor Correction - Definition, Formula and Example

Definition :

Power factor correction may be used to counteract the distortion and raise of the power factor in an Electrical system. It is always better to have the power factor of a system to near 1.0. Power factor which is below 1.0 requires a utility to generate more than the minimum volt-amperes, which is necessary to supply the real power (watts). This tutorial will teach you how to find the PF correction value with the proper given inputs.

Formula :
Original KVA = KW / Current PF New KVA = KW / Desired PF

PF - Power Factor KW - KiloWatts kVA - Kilo Volt Amperes

Example :

An electric motor has a power factor of 0.8 and its expected power factor is 0.9. Power rating of a device connected to the electric motor is 100KW. Find the power factor correction for the given values?


Connected Load = 100 KW Current PF = 0.8 Desired PF = 0.9

To find,

Power Factor Correction


Substitute the given values in the formula,

Original KVA = KW / Current PF Original KVA = 100 / 0.8 Original KVA = 125 New KVA = KW / Desired PF New KVA = 100 / 0.9 New KVA = 111

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