Sms Siemag Aktiengesellschaft

Roland Koenig

Rolf Degel

Thomas Pasch

Andreas Haaks

The invention relates to an electronic circuit and a method for feeding power to at least one electrode of an alternating-current electric-arc furnace, particularly for melting metal. Known circuits of this type typically comprise a series connection with a transformer for providing a supply voltage for the electric-arc furnace from a power grid () and a AC power controller () connected between the transformer () and the electrode () for regulating the current through the electrode (). According to the invention, a further development for such electronic circuits is proposed, which development has a simple design, is inexpensive and prevents overload of the AC power controller () even in operating modes of the electric-arc furnaces at high electrode currents. This further development provides to bypass the AC power controller with a bypass switch () that is opened or closed with the help of a controller as a function of the amount of current flowing through the electrode ().

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Duisburg, Germany

Roland Koenig