Abstract: A thyristor circuit includes at least one branch including at least one thyristor, a thyristor control circuit and a current detector. The current detector is configured to detect a current value representative of an electrical current flowing through the thyristor and to input the detected current value into the thyristor control circuit. The thyristor control circuit is configured to determine a fault condition in which the detected current value exceeds a predetermined current threshold based on a deteriorated blocking ability of the thyristor. Dependent on the determination result, the thyristor control circuit triggers the thyristor into a conductive state.

Abstract: A power component includes two electric terminals, a component housing, a main component at least partially surrounded by the component housing, connected with the two terminals, and configured to carry a power current flowing between the two electric terminals, and a sensor and emitter unit which is configured to measure a value of a physical quantity (T, V, ?V) characterizing an operating state of the main component, and to emit an electromagnetic signal, in which the measured value of the physical quantity is encoded. The sensor and emitter unit includes an antenna for emitting the electromagnetic signal which is spaced apart from the main component and arranged in, on and/or at the component housing.

Abstract: A thyristor circuit includes at least one branch including at least one thyristor, a thyristor control circuit and a current detector. The current detector is configured to detect a current value representative of an electrical current flowing through the thyristor and to input the detected current value into the thyristor control circuit. The thyristor control circuit is configured to determine a fault condition in which the detected current value exceeds a predetermined current threshold based on a deteriorated blocking ability of the thyristor. Dependent on the determination result, the thyristor control circuit triggers the thyristor into a conductive state.

Abstract: A control device for an arc furnace includes an arc furnace control module for controlling the arc furnace and a flicker module for determining a flicker value in a grid supplying the arc furnace, wherein the arc furnace control module is adapted for controlling the arc furnace based on the flicker value and wherein the arc furnace control module and the flicker module are integrated into one structural component.

Abstract: A control device for an arc furnace includes an arc furnace control module for controlling the arc furnace and a flicker module for determining a flicker value in a grid supplying the arc furnace, wherein the arc furnace control module is adapted for controlling the arc furnace based on the flicker value and wherein the arc furnace control module and the flicker module are integrated into one structural component.

Abstract: A method and apparatus for balancing a three point DC voltage intermediate circuit involves a converter circuit which influences an electrical power flow in a three point DC voltage intermediate circuit. An intermediate circuit voltage mean value is formed from a first intermediate circuit voltage across a first capacitor, and from a second intermediate circuit voltage across a second capacitor. Based on an intermediate circuit voltage mean value exceeding a threshold value, the first capacitor is connected by means of the converter circuit to an energy store, and the energy store is then connected by means of the converter circuit to the second capacitor. If the threshold value is significantly undershot, the second capacitor is connected to the energy store by means of the converter circuit, and the energy store is then connected to the first capacitor by means of the converter circuit.

Abstract: A method is specified for balancing a three-point DC voltage intermediate circuit (1), in which a converter circuit (2), which is connected to a first capacitor (C1) and to a second capacitor (C2) in the three-point DC voltage intermediate circuit (1), influences the electrical power flow in the three-point DC voltage intermediate circuit (1), and in which an intermediate circuit voltage mean value ({overscore (UDC)}) is formed from a first intermediate circuit voltage (UDC1), which is present across the first capacitor (C1), and from a second intermediate circuit voltage (UDC2), which is present across the second capacitor (C2).