control modernization bar mill shuttle section cold mills production control system high performance automated equipment hot strip mill batch annealing automation levels process control material tracking functions heating dc electric arc furnace power input optimization eaf power demand arc regulation software ac eaf installation electrode regulator electric arc regulator electrode consumption dc furnace steel industry failure of eaf transformer thermal stress spare transformer degas series reactor catastrophic failure dielectric surge arrester failure operating practices eaf transformer transformers failures primary switches oil tests
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