Abstract: A short-circuit current limiter has a vacuum switch in a main current path and a current-limiting unit connected in parallel therewith in a commutation current path. The vacuum switch has switching contacts. A material of contact pieces of the switching contacts is selected such that a mean value of the chopping current is at least 8 amperes.

Abstract: An electrolysis system for breaking down water into hydrogen and oxygen using at least two electrolysis modules, each electrolysis module having at least two electrolytic cells, an electrolytic cell having an anode compartment and a cathode compartment, the anode compartment being separated from the cathode compartment by a proton exchange membrane, and a switching device, which is compatible with direct current, being arranged electrically in parallel with at least one electrolysis module. The electrolysis system is operated by the at least two electrolysis modules. When the available electrical power decreases, at least one switching device is closed. At least one electrolysis module is bridged by the switching device. The number of electrolysis modules which are then operated is reduced by the number of bridged electrolysis modules. When the available electrical power increases, at least one switching device is opened.

Abstract: Various embodiments of the teachings herein include a grid influencing system for a power supply grid comprising: a current-conducting grid influencing component; and a vacuum circuit breaker including a vacuum circuit breaker tube containing an at least partly integrated pre-arcing device for actively generating an arc between two contacts.

Abstract: An arrangement contains a polyphase transformer which has primary windings and secondary windings. The secondary windings are connected to form a star circuit, the star point of which is connected to earth potential by means of an overvoltage-limiting device. The overvoltage-limiting device has a first overvoltage-limiting component. A switch, which electrically bridges the first overvoltage-limiting component in its closed state, is assigned to the first overvoltage-limiting component.

Abstract: A make contact system for high-voltage applications includes a vacuum switching tube having two switch contacts in the form of plate contacts, of which at least one is a moving contact coupled to a drive. At least one plate contact is rotationally symmetrically surrounded by a shielding element, and the shielding element has an electric conductivity which is less than 40×10?6 S/m.

Abstract: A vacuum circuit breaker includes a vacuum circuit breaker tube having a vacuum housing in which a contact system is disposed. The contact system includes two contacts which are movable relative to one another. An electrical pre-arcing unit having an ignition electrode in the vacuum housing is provided for igniting an arc along an arc current path.

Abstract: A vacuum switching device for medium or high voltages contains two contacts. At least one contact of which is mechanically movably mounted by a drive rod and thus is in electrical contact with the drive rod. The vacuum switching device has a vacuum chamber in which the contacts are arranged. The vacuum switching device has a spring contact, which is outside the vacuum chamber, and the drive rod, when the contacts are closed, is in electrical contact with a power line via the spring contact, and in that the spring contact, when the contacts are open, is electrically insulated from the drive rod.

Abstract: An arrangement contains a polyphase transformer which has primary windings and secondary windings. The secondary windings are connected to form a star circuit, the star point of which is connected to earth potential by means of an overvoltage-limiting device. The overvoltage-limiting device has a first overvoltage-limiting component. A switch, which electrically bridges the first overvoltage-limiting component in its closed state, is assigned to the first overvoltage-limiting component.

Abstract: A make contact system for high-voltage applications includes a vacuum switching tube having two switch contacts in the form of plate contacts, of which at least one is a moving contact coupled to a drive. At least one plate contact is rotationally symmetrically surrounded by a shielding element, and the shielding element has an electric conductivity which is less than 40×10?6 S/m.

Abstract: Various embodiments of the teachings herein include a grid influencing system for a power supply grid comprising: a current-conducting grid influencing component; and a vacuum circuit breaker including a vacuum circuit breaker tube containing an at least partly integrated pre-arcing device for actively generating an arc between two contacts.

Abstract: A vacuum circuit breaker includes a vacuum circuit breaker tube having a vacuum housing in which a contact system is disposed. The contact system includes two contacts which are movable relative to one another. An electrical pre-arcing unit having an ignition electrode in the vacuum housing is provided for igniting an arc along an arc current path.

Abstract: A superconducting current limiter with a bifilar coil winding made of a Tc superconductor (HTS) conductor in a cryostat that includes a solid filler material, where the solid filling material is particularly formed from a granulate, hollow bodies or an open-pored structure and is surrounded by cryogen.

Abstract: The present disclosure relates to electric coil systems having a choking coil for inductive-resistive current limitation. The teachings herein may be embodied in an inductive-resistive current limitation system and to a method of production with such an electric coil system. For example, an electric coil system may include: a choking coil; a bearing body arranged inside the choking coil; and at least one closed annular superconducting conductor element having at least one closed annular superconducting layer arranged on the bearing body.

Abstract: The present disclosure relates to current limiter devices. Various embodiments thereof may be useful for limiting a short-circuit current in a superordinate electrical supply system, wherein the current limiter device has a current-limiting coil device and a switch electrically connected in series with the coil device and/or methods for limiting a short-circuit current in an electrical supply system with such a current limiter device. For example, some current limiter devices for limiting a short-circuit current in a superordinate electrical supply system may include: a current-limiting coil device; and a switch connected in series with the coil device. The switch may comprise a load interrupter switch.

Abstract: The present disclosure relates to transformers. Teachings thereof may be embodied in a transformation unit having a primary winding and a secondary winding. For example, a transformer may include: a first transformation unit with a primary winding and a secondary winding; and at least one high-temperature superconducting conductor in each of the two windings. Each of the two windings is wound around a first annular base structure common to both windings in a plurality of turns such that both of the two windings extend over a jointly-wrapped part of the circumferential extent of the annular base structure.

Abstract: The invention refers to a multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator (1) and a medium voltage (MV) transmission level for a transmission link to each other, the power converter (I) comprising for each phase: a switching unit (9) for adapting the low voltage (LV) and the medium voltage (MV) to each other, the switching unit (9) being controlled by a controller (15), whereby the controlled switching unit (9) separately switches n+1 terminal potentials along terminals of an electrical series of n>1 capacitors C1 . . . Cn (7); a current converter (5) for providing or using a direct current (DC) through the plurality of n>1 capacitors C1 . . . Cn (7) connected in series.

Abstract: A device for limiting current with variable coil impedance includes a choke coil and a cooling device. An additional coil is made of a high-temperature superconducting material and is disposed in the choke coil such that the current is limited by the device without using an iron core.

Abstract: The invention refers to a multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator (1) and a medium voltage (MV) transmission level for a transmission link to each other, the power converter (I) comprising for each phase: a switching unit (9) for adapting the low voltage (LV) and the medium voltage (MV) to each other, the switching unit (9) being controlled by a controller (15), whereby the controlled switching unit (9) separately switches n+1 terminal potentials along terminals of an electrical series of n>1 capacitors C1 . . . Cn (7); a current converter (5) for providing or using a direct current (DC) through the plurality of n>1 capacitors C1 . . . Cn (7) connected in series.

Abstract: The invention relates to a Terminal (I) for electrical connection of an amount of electrical generators (1) to a high-voltage transmission network (3), the terminal (I) comprising connected in series in this order for each generator (1) assembly level (Li): a start AC/DC converter (5) for rectification of the generator voltage(s); a series resonant converter (7) for galvanic isolation between the generator (1) and the high-voltage; a converter unit (9) for providing the high-voltage.

Abstract: To limit current rise in a high voltage DC system, the current can be led through a current rise limiter. An exemplary current rise limiter can have an inductance that increases with the current I through the current rise limiter and/or with a time-derivative dI/dt of the current I. In such a system, the current rise limiter can have minor influence on normal operation, but can limit the rise rate of the current in the event of a fault to, for example, provide more time to switch off the current.