Search academic texts

Information × Registration Number 0222U002484, 0117U001847 , R & D reports Title Harmonic components of voltages and currents for single-phase ground fault in networks with isolated neutral popup.stage_title Head Baran Petro M., Кандидат технічних наук Registration Date 13-02-2022 Organization Lviv Polytechnic National University popup.description2 A mathematical model of analysis of higher harmonic components of signals was formed and its digital implementation was carried out, which made it possible to study electromagnetic processes of single-phase earth faults (SPEF) in networks with isolated or compensated neutral. The study of electromagnetic processes in networks with isolated or compensated neutral in different emergency modes. The analysis of higher harmonic components of voltages and currents of clearing SPEF, arcing SPEF and ferroresonance processes is carried out. It is shown that the content of higher harmonic components increases sharply during arcing SPEF. Odd harmonics predominate in zero-sequence voltages and zero-sequence currents. The highest values of the higher harmonic components are present in the zero sequence current of the damaged connection. It is established that the pronounced non-sinusoidality of voltages and currents during arcing earth-fault is associated with the transient process of recharging the capacitors of the damaged and undamaged phases. The results of the analysis of higher harmonic components of SPEF voltages and currents can be used to improve the earth-fault detection algorithms and to determine the faulty connection in digital SPEF protection devices. Product Description popup.authors popup.nrat_date 2022-03-09 Close