Electrical Engineering › Section L · Power (ac) and resonance › Topic L.3
Power-factor correction
Motors and other inductive loads draw more current than the real power they use would need. A capacitor placed across them supplies their reactive power on the spot, so the supply delivers less current for exactly the same work.
In this topic
- Why the supply wants less current
- The idea: supply the VAR locally
- The phasor picture
- Sizing the capacitor
- Worked example: correcting a motor to unity
- Worked example: a workshop raised to 0.95
- Why stop at 0.95 lagging?
- What correction does and does not do
- Common mistakes to avoid
- Key takeaways
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