Power Factor and APFC

Origin of Low Power Factor

Electrical Equipment need Reactive Power
Inductive loads draw Reactive Power
Phase difference between current & Voltage reduces Displacement PF .
Reactive Power to maintain magnetic fields in Motors.
Non-Linear loads reduces Distortion PF .
True PF, being product of displacement and distortion PF is lower than both.

Disadvantages of low power factor

Inefficient use of Electrical Energy:
Overloading of Transformer/Generator;
....etc

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BEL Placement Paper May 2008



1. Numerical problem based on modulation index fc, fm . (formula based direct queston).

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No.of Questions : 20
Duration in Minutes: 20
Assessments by Merit Trac
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