STUDY OF ASYMMETRIC OPERATING MODES OF LOW-VOLTAGE ELECTRICAL NETWORKS IN THE ALTAI REGION
This paper continues the research on the operating modes of distribution electrical networks with a voltage of 0.38 kV in the Irkutsk Region. This study analyzes the results of practical measurements in the operating distribution electrical network with a voltage of 0.38 kV in the Biyskiy District of the Altai Region. Based on the measurements made, using the methods and digital technologies developed and described earlier, the calculation and analysis of indicators characterizing the change in the quality of electrical energy and its additional losses due to asymmetric power consumption was carried out. It was found that the most significant reason for the change in these indices was the objectively existing asymmetry of phase currents and voltages. Due to the increase in zero-sequence flows, there is an increase of the indices characterizing the asymmetry of the three-phase voltage system which not only distorts the power supply voltage, but also leads to increase of additional heat losses, creating increase of electricity consumption and a threat of fire hazard situations. With the use of digital calculation software developed earlier, it is proved that the zero-sequence flows are effectively reduced by a special shunt-balancing device which parameters automatically change with a change in the level of asymmetric power consumption in the electrical network under study. The use of graphical MATLAB technologies made it possible to visualize the dynamics of the studied indices in the electrical network before and after the installation of the balancing device. The research findings may be useful to scientists involved in the study of operating modes of existing electric networks as well as specialists from electric grid companies who monitor the quality of electric energy in electric networks.