Design, Analysis and Operation of the Electrical Distribution System for a Modem Electric Arc Furnace and Ladle Melt Furnace

An electric arc furnace, ladle melt furnace, single-tank vacuum degasser and a four-strand continuous caster comprise this new melting and casting operation that support a rod and bar-in-coil rolling mill. This paper describes the design, analysis and operation of the electrical distribution system for this modern electric arc furnace and ladle melt furnace. First, the design of the electrical distribution system provided adequate capacity to support simultaneous operation of both the electric arc furnace and the ladle melt furnace in support of melt-shop operations. Next, harmonic analysis and flicker analysis of the circuit supplying the furnaces resulted in specification of a multi-stage filter that insured acceptable levels of harmonic distortion and voltage flicker on the utility supply as well as voltage support during all stages of arcing. Finally, operation experience gained from furnace performance during initial startup lead to subsequent fine tuning to achieve higher levels of production.