About Electric Energy Additional Losses Reduction at the Phase Currents Unbalancing in the 0.38 kV Operating Networks

Abstract

The materials of operation unbalancing modes studies in operating distribution electric 0.38 kV networks are presented. For research, electric energy parameters systematic measurements materials and its indicators characterizing the power quality have been used. The measurements were made by an electric grid organization order that provides to facilities power supply in the Irkutsk region. To assess the unbalancing modes, in accordance with the developed calculating the currents and voltages unbalance methods, the program “Imbalance-2" was created to determine these indicators. As a minimizing additional losses means, a special shunt-balancing device is used, which has the lowest possible zero-sequence currents resistance, which automatically changes its parameters. The program provides the device parameters determination in accordance with the changing current unbalance level at any time moment. Based on the created algorithm, the indicators characterizing the power quality, as well as additional power and energy losses caused by this unbalance are calculated and analyzed. It is established that the power quality meets the State Standard requirements, but the additional losses level is quite high. The full power total losses in the individual electrical network elements have been determined and the balancing device efficiency degree to reduce these losses are established. The used balancing device economic efficiency is determined.