Magnetising inrush current of low-voltage iron core three phase power reactors

The paper presents the quantitative evaluation of the magnetizing inrush current initiated at the connection instant of various three phase iron core reactors to a low-voltage power network. An analytical approach is adopted, which bases on the ferromagnetic coils circuit model and its time domain transient characterization. Thus, the solutions of the corresponding nonlinear differential equation system allow extracting the main inrush current features: waveform signature, amplitude and duration. The major power quality issues generated by the three phase reactors energizing process are also investigated and additionally some inrush current mitigation techniques are suggested.