Abstract
The paper describes a new calculation method for active and inductive resistance of split interleaved current leads packages in ore-thermal electric furnaces. The method is developed on basis of regression analysis of dependencies of active and inductive resistances of the packages on their geometrical parameters, mutual disposition and interleaving pattern. These multi-parametric calculations have been performed with ANSYS software. The proposed method allows solving split current lead electrical parameters minimization and balancing problems for ore-thermal furnaces.
Highlights
Products made in ferroalloy furnaces are needed for steel production, the amount of ferroalloy production tends to grow constantly
Electrical parameters of the short network are affected by many phenomena, such as skin-effect, proximity effect, uneven distribution of current between conductors, power transfer between conductors and phases, energy losses through neighboring metal constructions, etc
Important requirements that have to be fulfilled in an orethermal furnace’s short network are: minimal length and spatial symmetry of phases, minimal surface area covered by one phase, proper choice of conductors and rational usage of their crosssection, most rational interleaving pattern, which enables them to be loaded evenly with current and achieve same electrical parameters in all phases
Summary
Products made in ferroalloy furnaces are needed for steel production, the amount of ferroalloy production tends to grow constantly. Important requirements that have to be fulfilled in an ore-thermal furnace’s short current lead are: minimal active and inductive resistances in phases and their symmetry. Modern powerful ore-thermal furnaces contain in their secondary current lead a rigid immovable part (Fig. 1) made up of a package of water-cooled bus tubes. Oftentimes it is the longest part of the short current lead. Electrical parameters of the short network are affected by many phenomena, such as skin-effect, proximity effect, uneven distribution of current between conductors, power transfer between conductors and phases, energy losses through neighboring metal constructions, etc. The task of designing a secondary current lead with rational parameters is of great significance, and effective methods for the calculation of these parameters on that stage are needed
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