Research of parameters of operation of the three-phase transformer with the compensatory device in a network with household loading | Исследование параметров эксплуатации трехфазного трансформатора с компенсационным устройством в сети с бытовой нагрузкой
2011
Timoshuk, A.L. | Zimnitskij, D.V., National Academy of Sciences, Minsk (Belarus). Scientific and Practical Center for Agriculture Mechanization
Electric supply of consumers in agricultural area is carried out with the help of three-phase switch-yards of full power 100-250 kWt and voltage equal 10 kV. Three-phase consumers, such as asynchronous motors, are often used in agricultural enterprises and substantiate construction of three-phase high voltage switch-yards. But domestic customers not require such high-voltage current. Distribution of electricity flows in different canals appears a serious problem because of essential losses of electric energy during periods of intensive loading. Voltage deviation may compose 12-14 up to 25-30 %. Instability and irregularity of current distribution causes misbalance of magnetic flow in core, increasing zero current flow and overflow of switch yard. Voltage deviation leads to breakdown of electric appliances and negatively reflects on electric supplement of customers. Therefore, creation of simple and effective device with low self-cost, able to quick alignment of phase voltage in three-phase switch-yard is considered to be necessary. Experimental sample of three-phase switch-yard TMKU 100-10/0.4 is suggested in the article. The scheme of switch-yard with compensating field is presented. General view of switch-yard, connected to experimental stand, is shown. Phase voltages and currents in the regime of overloading of A phase with the 119A current are displayed. Changes of voltages in A,B,C phases depending on current deviations in TMKU 100-10/0.4 i switch-yard is shown on graph. Main advantages of TMKU 100-10/0.4 i switch-yard utilization are enumerated.
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