超高功率电弧炉变压器的设计

提出了一种新的高阻抗电弧炉变压器二次电压和最大额定电流的设计方法.熔末升温期“甩抗”后，为保证电效率最大，即电弧电压始终处在泡沫渣下的峰值，且充分发挥变压器能力，就必须对分档电压和最大额定电流进行合理的设计.“甩抗”后，根据泡沫渣最大高度、功率因数、变压器额定容量等约束条件，建立了变压器分档电压和最大额定电流的设计原则，使变压器利用率和电弧功率达到最大，缩短冶炼周期.同时提出了变压器容量和最高、最低二次电压的设计方案.对80t高阻抗电弧炉设计参数和理论运行参数进行分析，结果表明:分档电压设计在734V为最佳，超过734V时，变压器的最大额定电流成为提高电弧功率的限制性环节.

Design of Transformer for Ultra-High-Power Electric Arc Furnace

A new design method for high-impedance electric arc furnace transformer voltages and rated current is put forward. After the “reactor short-circuit”， in order to ensure electrical efficiency by maintaining the arc voltage at the peak value in foaming slag， and to make full use of the transformer capacity， the stepped voltage and rated current of the transformer should be properly designed. The design principle for stepped voltage and rated current is established considering the constraint conditions of foaming slag thickness，power factor and transformer capacity， which will increase the transformer utilization and arc power， and cut down the melting time. At the same time，the designs of the maximum and minimum secondary voltages and transformer capacity are introduced. The results of analyzing the theoretical operation and design parameters of a 80 t high-impedance arc furnace show that the optimum stepped voltage is 734V. Above 734V， the limiting factor of increasing arc power is the rated current.