Converter-fed electric arc furnace with capacitor assembly in the secondary circuit

An electrical arrangement for an electric arc furnace operated with alternating current;

• wherein the electrical arrangement comprises a converter, a furnace transformer, a number of electrodes and a capacitor assembly;
• wherein the electrodes are arranged in a furnace vessel of the electric arc furnace, such that they apply electric arcs to a melt material in the furnace vessel;
• wherein the converter has an input side connected to a supply grid having a network frequency (f) and a network voltage (U) and has an output side connected to the furnace transformer;
• wherein the furnace transformer is configured to step down a primary voltage (U′) which is fed to the furnace transformer from the converter into a secondary voltage (U″) which is fed to the electrodes;
• wherein the furnace transformer the input side is connected to the converter and the output side, is connected to the electrodes of the electric arc furnace and to the capacitor assembly;
• wherein a control device controls the converter such that a primary voltage (U′) output from the converter to the furnace transformer has a furnace frequency (f′) which is equal to at least ten times the network frequency (f) and/or is greater than 1 kHz;
• and
• wherein the furnace frequency (f′) is the fundamental frequency at which the electrodes are supplied.