Compensation filters

Compensation filters are used where application of the protected compensation device is insufficient due to the extremely high degree of network affection by the harmonics. These filters use the air-core chokes and are usually tuned to the frequencies of the harmonics 5, 7, 11 or 13. Parameters and versions of the filters depend fully on the specific application. The example presents capacitors of the filter of the third harmonic 22 kV and the relevant control switchgear.