2019 Pittsburgh AISTech

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Using Thyristor-Controlled Series Reactors to Improve EAF Productivity and Lower Operating Costs at North Star BlueScope Steel LLC (Room 406)

The installation of an advanced, dynamically controlled series reactor system has enabled North Star BlueScope Steel (NSBSL) to run their 195-ton, twin-shell, AC shaft furnaces with independent voltage and current control on each electrode. Precise individual arc current setpoints lower electrode consumption. Accurate individual arc voltage control delivers well-shielded balanced or specifically unbalanced arc power. The variable series reactor system is based on the Hatch SPLC technology and has operated continuously for two years. In addition to record production achieved in 2017, lower operating costs have been benchmarked through less refractory wear, less tap changer maintenance and fewer electrode breaks.