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Improved Electrical Mode Control Method for Ladle Furnace Using Data on Harmonic Composition of Arc Current

This study deals with the analysis of the intensity effect of the argon purge mode in the ladle furnace (LF) on the current electrical unit operation mode. It was found that, during intense argon purging, intense liquid metal waves and bursts are formed on the liquid bath surface, leading to the periodic shorting of the approximate phases to the unstable zone. It is proposed that the presented method of automatic adaptation of the LF electric mode to the changing working conditions, which is based on the analysis of the harmonic composition of the arc currents solves the problem. As a result, it is possible to achieve a more stable mode for maintaining the impedance set point value, which has a beneficial effect on the energy efficiency of the steel-making complex.