COMPLEX BUS BAR MODELING IN PHASE COORDINATES

PURPOSE. Today it is impossible to design and operate low-voltage networks without the creation of methods of mode computer simulation. However, the basic works in this direction are devoted to high voltage networks and do not take into account the features of low voltage networks up to 1000 V. The purpose of the researches, the results of which are presented in the article, consists in the development of methods and tools for adequate simulation of electrical power supply system containing 0.4 kV bus bars with large buses. METHODS. The methods of electrical power system simulation in phase coordinates have been used to determine the modes of electric power supply systems (EPSS) equipped with bus bars. The methods applied are based on the representation of multiwire elements of lattice equivalent circuits with full-meshed topology. The proposed simulation method of EPSS with bus bars allows to consider the real distribution of currents on bus sections, the skin effect, the proximity effect as well as the availability of metal boxes for bus placement. The main idea of the method is the change of buses by a set of thin wires whose joint current is equal to the bus current. RESULTS. The introduced simulation method of bus bars with rectangular buses allows to implement the system approach to EPSS mode determination and provides the opportunity of correct consideration of the skin and proximity effects when mode calculation. The adequacy of the method is confirmed by the agreement of simulation results and experimental data. Magnetic fields can be created in the proximity to the non-shielded bus bar. Their strengths considerably exceed the normalized values. Bus bars with bundled phases create especially high strength levels. The use of rational phasing allows to reduce the strength value. CONCLUSION. Computer simulation has shown that the use of multiwire models provides correct accounting of skin and proximity effects when used for mode calculation of networks with bus bars.

power supply system, bus bars, phase coordinates, simulation, ohmic resistance, active resistance

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