Passive Harmonic Filter is designed to maintain the Power Factor with the Harmonic Mitigation. Power factor correction in systems where harmonics are generated by nonlinear loads, each step of detuned filters consists of a capacitor and a series reactor connected in series. These two from a series resonant circuit tuned at a frequency below the lowest harmonics frequency present in the system normally the 5th (250Hz). The detuned filter also removes lower order harmonics from the system to some extent. This will help to offset the Resonance effect for longer trouble-free operation.
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