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The current unbalance produced by the EAF operations may induce the torsional vibrations on shafts of a small scale steam turbine generator nearby. The vibrations might not be ignored due to that the unbalance is severe and sustained. What's even worse, the vibrations might be significant if there are any vibration modes which frequencies are closed to the double system frequency. In this paper, turbine shafts vibrations induced by the EAF operations are analyzed by modeling and simulating a practical distribution system with the MATLAB PSB. Since it is the field measured current data that are fed to the models, the time domain responses can be quite resemble to the real. Furthermore, we have designed a flywheel coupler, which can be quite effective in alleviating vibrations caused by the current unbalance.