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.

A method for producing an electrical switch contact arrangement for a vacuum circuit breaker includes the following steps: a) providing two electrical contact pieces made of copper or a copper alloy; b) coating the electrical contact pieces with aluminum or an aluminum alloy, the coating of the contact pieces taking place by means of a cold gas spraying method; c) welding each of the sides coated in method step b) to a current transfer contact; and d) arranging the units obtained in method step b) inside the vacuum circuit breaker. There is also described an electrical switch contact arrangement for a vacuum circuit breaker with the contact pieces produced by the method according to the invention.

Provided is a vacuum interrupter capable of improving an axial magnetic field intensity even at a contact portion other than a region of the contact portion corresponding to a region surrounded by an arm portion and a coil portion. In the vacuum interrupter according to the present disclosure, in each coil electrode, a bypass portion has: a second coil portion which extends so as to have an overlap with a corresponding first coil portion and a power feeding portion opposed to the first coil portion, in a circumferential direction; a first arm portion which connects the second coil portion and a ring portion; and a second arm portion which connects the second coil portion and the first coil portion.

According to one embodiment, a Vacuum interrupter includes a pair of electrodes provided such that their electrode opposed surfaces face each other, and an undulating structure provided in at least one of the electrode opposed surfaces. The undulating structure includes one or more projections which project from the electrode opposed surface, and depressions provided so as to be adjacent to the projections, respectively. The projections and the depressions are alternately provided in a direction crossing the electrode opposed surface. In a conducting state in which the electrodes are in contact with each other, the projections are in contact with the opposite electrode opposed surface.

An ultra-fast moving conductor for use with a circuit breaker is provided. The moving conductor includes a hollow outer stem and a removable core. Multiple removable cores are produced for use with the moving conductor for different purposes. The outer stem is produced from annealed copper that must be brazed before the circuit breaker is placed into operation, and a first removable core produced from copper is inserted into the outer stem to provide structural reinforcement to the outer stem during brazing. After brazing is complete, the copper core is removed from the outer stem, and a significantly lighter work hardened aluminum core is inserted into the outer stem. The lightweight aluminum core enables the moving conductor to open the circuit breaker much faster than the copper core would, and the copper core prevents contamination of the brazing furnace that would result from using the aluminum core during brazing.

A process for producing an electrode material by infiltrating a highly conductive metal such as Cu into a porous object containing heat-resistant elements. Before an infiltration step in which the highly conductive metal is infiltrated, a HIP treatment is given to a powder containing the heat-resistant elements (or to a molded object obtained by molding a powder containing the heat-resistant elements). The composition is controlled so that the HIP treatment yields a porous object which has a degree of filling of 70% or higher, more preferably 75% or higher. The highly conductive metal is infiltrated into the porous object having the controlled composition.

A vacuum interrupter includes a housing having at least one annular ceramic insulating element which forms a vacuum chamber. A contact system has two contacts which are movable relative to one another. A capacitive element has two electrodes and a dielectric material disposed between the electrodes. The capacitive element is form-lockingly mounted on the insulating element and has a capacitance between 400 pF and 4000 pF. A high-voltage switching assembly including the vacuum interrupter is also provided.

A vacuum circuit breaker comprises a vacuum interrupter operable between a closed state and an open state, and an actuator. The actuator comprises a piezoelectric driving element that is expandable and contractable along an expansion axis in response to an electrical input signal. The actuator further comprises a mechanical amplifying structure extendable along an actuation axis and being mechanically coupled to the piezoelectric driver such that expansion or contraction of said piezoelectric driving element causes the amplifying structure to extend or retract along the actuation axis. The mechanical amplifying structure is coupled to the vacuum interrupter for operating the vacuum interrupter between said closed and open states.

A composite metal where a phase of particles of solid solution is uniformly dispersed in a Cu phase, the solid solution containing a solid solution of a heat resistant element selected from Mo, W, Ta, Nb, V and Zr and Cr. The composite metal is provided to contain: 20-70% of Cu; 1.5-64% of Cr; and 6-76% of a heat resistant element by weight relative to the composite metal, wherein a remainder is comprised of inevitable impurities. In the composite metal, the particles of the solid solution, contained in the composite metal, are provided to have an average particle diameter of not larger than 20 μm and to uniformly disperse in the Cu phase with an index of the dispersion state of not higher than 1.0.

Electrical switching contact with radial magnetic field for a medium-voltage vacuum interrupter including a rod and a contact body, coaxial to the rod, which includes a disc and a circular element concentric with the disc and arranged protruding on a face of the disc, the other face of the disc being secured to the rod. The contact body has a spiral configuration; the disc includes slits in the thickness of the disc which extends from the periphery of the disc towards the centre of the disc; the circular element has an outer diameter smaller than the diameter of the disc. The disc and the circular element are made of a copper alloy with a refractory metal chosen from among chromium, tungsten and molybdenum, the alloy of the circular element including a proportion by weight of the refractory metal greater than that of the alloy of the disc.