An AC line reactor (inductor) wired in series between the mains supply and the elevator drive to attenuate harmonic distortion and limit inrush current.
Full Definition
An elevator line reactor is a three-phase or single-phase inductive component inserted in series with the power supply conductors feeding the variable-frequency drive (VFD) or soft-starter of an elevator. Its primary functions are: (1) reducing total harmonic distortion (THD) injected back into the building supply to comply with IEC 61000-3-12; (2) limiting di/dt inrush current during drive start-up; (3) providing impedance that protects the drive IGBT modules from supply-side voltage spikes and notches. Typical inductance values range from 1.5 % to 5 % line impedance. EN 81-20 §5.10 and EN 81-50 require that electrical equipment does not cause interference to other devices; line reactors are a standard mitigation measure. They are mounted in the controller cabinet or on the machine room panel and must be rated for the full drive input current.
