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Electric arc furnace is of the non-linear loads for which different models have been suggested in order to its functioning analysis so far and it can have great effects on its neighboring generators. The goal in this paper is to study the effects of precision modeling on the power system local generator shaft. For this purpose, three models nearer to reality are employed for furnace simulation so as to study its effect on the generator shaft and on the point of connection among the turbines. The new method employed in this research is to consider different stages of melting and the use of the most suitable furnace model for simulation in that stage. So, an attempt is made to consider - the important stages of melt - which can affect the generator and to use a model which can describe the furnace operation in the best possible way in each stage. By using the graph of torque waves exercised on the generator shaft, the existing problems are studied and analyzed.