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On specific features of modeling electromagnetic field in the connection area of side busbar packages to graphitization furnace current leads

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Abstract

This paper describes methods for intensification of the electrical parameters and calculation of the effective cross sections of the end busbars, the current leads of the graphitization furnaces, and the sections of the side busbar packages on the side of an ac graphitization furnace rear end, as well as increasing the energy efficiency of both the furnace equipment and the graphitization electrical system as a whole developed to produce marketable and competitive products. The existing models and calculation methods are inadequate, significantly distort the actual picture of the electromagnetic processes in a complex spatial system of the current leads in a graphitization furnace and the busbar packages of the furnace loop, and do not meet current accuracy standards. In this work, conjugate three-dimensional electromagnetic and thermal fields in the connection area of the side busbar packages to the current leads of an ac graphitization furnace have been numerically simulated by finite element methods and on the basis of the theories of electromagnetic fields and of heat and mass transfer. This paper presents theoretical studies and a simulation of the electromagnetic, electrothermal, and heat-and-mass transfer processes in the connection areas of the side busbar packages to the current leads of the graphitization furnace based on numerical implementation by a finite element method of a generalized 3D model of dc and ac graphitization that considers the temperature dependences of the electrophysical and thermophysical properties of the materials of the busbars and the current leads. A technique for calculation of the effective cross sections of the end busbars according to the equal load criteria has been proposed, which ensures reductions in the weight and the electrical losses in the end busbars. The pattern and regularities of distribution of the current densities and the specific electric losses in the end busbar packages and the current leads of the ac graphitization furnaces have been defined. It has been established that selection of effective cross sections of the end busbar packages based on the criteria of equal loads in terms of the current density and the specific electric losses enables a reduction in the weight by 12% and in the active losses by 15% as compared to the default design, thus enhancing the energy efficiency of the graphitization electrical system. The proposed technique can be applied to both direct action resistance furnaces and high-capacity electric arc furnaces of ac power frequency.

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Correspondence to D. S. Yarymbash.

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Yarymbash, D.S., Oleinikov, A.M. On specific features of modeling electromagnetic field in the connection area of side busbar packages to graphitization furnace current leads. Russ. Electr. Engin. 86, 86–92 (2015). https://doi.org/10.3103/S1068371215020121

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  • DOI: https://doi.org/10.3103/S1068371215020121

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