Filter reactor for harmonic mitigation
The Siemens 4EU3032-0FM08-0BA0 is a 3-phase filter reactor rated 50 kVAR at 525 V, 50 Hz, with a 14% p impedance and a resonant frequency of 134 Hz.
The 14% p (percent impedance) sets the tuning point of the filter reactor relative to the system's fundamental frequency. At 50 Hz, a 14% p reactor tunes the LC circuit to 134 Hz — that's the resonant frequency (FRES(HZ):134). This targets the 5th harmonic (250 Hz) and provides attenuation for higher-order harmonics, typical for a detuned filter bank protecting capacitors from harmonic overload. The 50 kVAR rating (QC(KVAR):50) is the reactive power the reactor can handle when paired with a capacitor bank of the same kVAR rating at the rated voltage.