Know about Passive Harmonic Filter The passive harmonic filter was designed to reduce harmonic currents caused by non-linear loads. It is currently available in horsepower ranges of 5 to 500, and it enhances power quality by eliminating harmonics while also increasing true power factor. It consists of reactors and capacitors in an LCL arrangement designed to reduce a broad range of harmonics associated with variable frequency drives and other three phase rectifiers. https://www.interwell.com.sg/Products/Schaffner/Passive-Filter-(THDI5)