Abstract

This study makes the case for a calculation of electric arc voltage’s instantaneous value in electric arc furnaces. It’s especially important for electric modes control tasks, and also for a heating stage diagnostic. The algorithm which allows to define instantaneous values of electric arc voltage in each phase with real signals of electric arc current and phase voltage was presented. This algorithm is based on furnace’s three phase circuit mathematical model. Besides, main problems related to this algorithm were identified, such as problem with definition of total phase resistance considering skin effect and the problem with definition of mutual inductance between three phases depending on the electrode arms position. The solutions for each of identified problems were suggested.

Keywords

Electric arc furnace, electric arc, arc voltage, heating stage diagnostic, harmonic composition of electric arc current and voltage