Sample interview questions: Can you explain your knowledge of electrical system power factor correction and harmonics mitigation?
Sample answer:
Understanding Electrical System Power Factor Correction and Harmonics Mitigation
Power Factor Correction:
- Improves system efficiency by reducing the phase angle between voltage and current.
- Reduces energy consumption and costs.
- Involves adding devices such as capacitors to the system.
- Benefits include increased power capacity, reduced voltage drop, and improved motor performance.
Harmonics Mitigation:
- Addresses distortions in the sinusoidal waveform of the AC power system.
- Caused by non-linear loads (e.g., computers, variable frequency drives).
- Can lead to equipment damage, reduced system efficiency, and interference with other devices.
- Mitigation techniques include using filters (e.g., passive or active harmonic filters), isolation transformers, or line reactors.
Comprehensive Knowledge:
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