During the recent years, with its increasing steel production, Turkey has succeeded to become one of the ten biggest steel producer countries in the world. In Turkey, there are 3 integrated plants and 27 Electric Arc Furnace (EAF) plants in operation for iron-steel production. 71,3 % of the steel products was produced by EAF plants and also it is planned for new plants to produce with arc furnaces. In this study, power quality problems caused by 60MVA arc furnace at Sivas Iron and Steel Incorporated Company (SIDEMIR), have been examined by HIOKI 3197 and Chauvin Arnoux(CA) 8332B power quality analysers according to IEC 61000-4-30 standards. In addition, with equivalent circuit model designed by utilizing Electromagnetic Transient Program(EMTP) software, possible harmonic effects on the electricity grid have been evalauted and by determining power quality problems caused by EAF-60 furnace, solution offers were presented in order to improve power quality.