Abstract: A tap changer for uninterrupted switching between winding taps of a tapped transformer has first and second load branches for each phase to be switched. Each load branch has a main vacuum switch and in parallel thereto a series connection of a switch-over resistance and a respective auxiliary vacuum switch. First and second vacuum switching tubes each contain the main vacuum switch of the respective first and second load branches and the auxiliary vacuum switch of the other of the load branches.

Abstract: The invention relates to a tap changer having vacuum interrupters for switching over between winding taps of a tapped transformer without interruption. The tap changer according to the invention having vacuum interrupters is based on the general idea of combining the functionalities of at least one conventional vacuum switching contact which switches under load and a further mechanical switching means according to the prior art in just one single vacuum interrupter with two separately moving contact systems.

Abstract: A short-circuit device for the electrical bypass of an electric module has a contact arrangement, which is disposed in a switching chamber. The contact arrangement has an open circuit-breaker setting, in which a current flow via the contact arrangement is interrupted, and a contact setting, in which a current flow via the contact arrangement is made possible. A pyrotechnic drive for transferring the contact arrangement from its circuit breaker setting into its contact setting, enables cost-effective, rapid bypass or short-circuiting, and the provision of a large current carrying capacity simultaneously. The switching chamber is a vacuum switching chamber in which a vacuum prevails.

Abstract: A leak sensor for monitoring a vacuum in a vacuum interrupter has a deformable separating wall, particularly in the form of a membrane or a bellows. The separating wall is connected to a vacuum chamber of a vacuum interrupter through a measuring opening. When the vacuum chamber of the vacuum interrupter is aerated or vented, the membrane or bellows is deformed. That deformation is detectable by a mechanical indicator device, an optical device or an electro-optical device.

Abstract: A vacuum-insulated switching device contains a grounded vacuum vessel, a contact system having a fixed contact and a moving contact, electrical connecting lines coupled to the fixed contact and the moving contact, and vacuum-tight bushings supported by the grounded vacuum vessel, and provide insulation from the grounded vacuum vessel. The vacuum-tight bushings seal the electrical connected lines. An insulating transmission element is provided. A driving apparatus is coupled to the moving contact via the insulating transmission element and in a vacuum-tight manner. Further vacuum-tight bushings are provided. A further vacuum vessel is disposed in the grounded vacuum vessel. The fixed contact and the moving contact are disposed in the further vacuum vessel and pass out of the further vacuum vessel via the further vacuum-tight bushings.

Abstract: A vacuum interrupter has a housing, a first contact system, which includes a movable contact piece and a fixed contact piece, and a second contact system, which includes a grounding contact and a grounded mating contact piece. The grounding contact is disposed on a movable contact rod, which is passed out of the housing in a sealing manner, with which vacuum interrupter an interaction of the arc with the grounded mating contact is prevented. The first contact system is held in the interior of the housing using vacuum-tight separating means, which divide the interior of the vacuum interrupter into a first interior having the first contact system and a second interior having the second contact system.

Abstract: A contact configuration for a vacuum switch includes cup-shaped contacts, which are movable one after another in a longitudinal direction and provided with slots for producing a radial magnetic field. A contact carrier whose side wall is provided with a front surface faces the opposite contact and a bottom section. Each contact has at least partially erosion-resistant contact elements, which cover at least the front surface and the internal bottom surface of the bottom section of the contact carrier facing the opposite contact.

Abstract: The aim of the invention is to improve the breaking ability of vacuum interrupter in the medium- and high-voltage range. Said aim is achieved whereby the contact pieces which may be displaced relative to each other are moved with a relatively high speed during a first phase (S1) of the separation process until about ¼ to ½ of the ultimate separation (extinction stroke Eh) and are brought to the given ultimate separation (isolating stroke Eh) during a second phase (S2) with relatively low speed.

Abstract: The aim of the invention is to prevent local spikes from being created in a contact element of a contact arrangement used for interrupting a current in a distribution network, said contact element comprising a contact support (8) that encompasses a hollow cylindrical wall section (9) and a bottom wall (10), and a contact disk (11) which is located opposite the bottom wall (10) in a longitudinal direction while slots (2) are provided for generating a magnetic field. Said aim is achieved by providing the slots (2) with rounded edges (3) having a defined radius.

Abstract: The invention relates to a contact arrangement for a vacuum switch tube for low-voltage power switches. The aim of the invention is to reduce the contact force required to control short circuit currents. To this end, a twin-contact contact arrangement is used wherein every contact comprises a plurality of separate individual contacts having a defined spring rate. At least one of the contact bodies (4) is configured as a two-layer spiral contact with a lower layer consisting of a highly elastic material and an upper layer (7) consisting of a highly electroconductive material. A contact coat (9) consisting of a contact material is provided on the upper layer in the outer zone of every contact arm (10).

Abstract: The aim of the invention is to optimize, in vacuum interrupters, the connection area (12, 13, 14) between housing parts (2, 3, 4, 5), which are coaxially assigned to one another, with regard to the complexity of production for centering measures and with regard to the execution of the soldering process. To this end, a ring-like discoidal centering means (15) is used, which is made of a silver-coated copper and which comprises centering lugs (18) located on a tubular flange (17) that is arranged on the inner periphery of the centering means. Said centering lugs extend in an axial direction of the coaxial assignment and are provided in the form of tabs that point toward the ring-like discoidal area (24) of the centering means. The centering means is thereby overlapped by a tubular copper part, which is joined to the centering means and which serves as a shielding (10) inside the vacuum interrupter.

Abstract: On both sides of a metal switching chamber, the novel vacuum switch tubes are respectively provided with two ceramic insulators which have the same diameter. Axially interspaced cylindrical vapor shields are fixed to the wing parts of said components. The easy to produce low-volume structure means that is possible to control operating voltages of more than 60 kV.

Abstract: A new vacuum switching chamber is intended for power breakers in the low-voltage range and is distinguished by a compact form with a small physical height and a high switching capacity. Its enclosure includes a plate-like power current connection, a cylindrical wall part which surrounds flat spiral contacts, an annular insulator and a membrane disk with a centrally arranged power current supply bolt.

Abstract: The aim of the invention is to improve the breaking ability of vacuum interrupter in the medium- and high-voltage range. Said aim is achieved whereby the contact pieces which may be displaced relative to each other are moved with a relatively high speed during a first phase (S1) of the separation process until about ¼ to ½ of the ultimate separation (extinction stroke Eh) and are brought to the given ultimate separation (isolating stroke Eh during a second phase (S2) with relatively low speed.

Abstract: The aim of the invention is to optimize, in vacuum interrupters, the connection area (12, 13, 14) between housing parts (2, 3, 4, 5), which are coaxially assigned to one another, with regard to the complexity of production for centering measures and with regard to the execution of the soldering process. To this end, a ring-like discoidal centering means (15) is used, which is made of a silver-coated copper and which comprises centering lugs (18) located on a tubular flange (17) that is arranged on the inner periphery of the centering means. Said centering lugs extend in an axial direction of the coaxial assignment and are provided in the form of tabs that point toward the ring-like discoidal area (24) of the centering means. The centering means is thereby overlapped by a tubular copper part, which is joined to the centering means and which serves as a shielding (10) inside the vacuum interrupter.

Abstract: This invention relates to a novel vacuum interrupter. The aim of the invention is for said is for said interrupter to perform the functions switching, disconnection and earthing and to be economically producible. Said aim is achieved by means of a first contact system produced with radial- or axial-magnetic filed contacts, the movable contact of which is connected to the movable contact of a second contact system, comprising annular discs. The stationary contact of the second contact system forms an annular part of the housing to which two tubular insulators are connected. One of the insulators encloses both contact systems and is protected by a screen fixed to the movable contact piece, which separates the plasma physics of the both contact systems.

Abstract: The invention relates to a contact arrangement for a vacuum switch tube for low-voltage power switches. The aim of the invention is to reduce the contact force required to control short circuit currents. To this end, a twin-contact contact arrangement is used wherein every contact comprises a plurality of separate individual contacts having a defined spring rate. At least one of the contact bodies (4) is configured as a two-layer spiral contact with a lower layer consisting of a highly elastic material and an upper layer (7) consisting of a highly electroconductive material. A contact coat (9) consisting of a contact material is provided on the upper layer in the outer zone of every contact arm (10).

Abstract: In a vacuum interrupter for circuit breakers, the aim is to reduce the contact pressure force. The contacts of the vacuum interrupter are configured for this purpose such that there is arranged inside an outer contact region, serving the purpose of arc quenching, an inner contact region which includes a plurality of resilient contact tongues arranged next to one another on a divided circle.

Abstract: A vacuum interrupter with a tubular insulator, to dielectrically optimize the fixing of a vapor shield which is provided at an encircling step of the ceramic insulator. A holding ring is assigned to the vapor shield and has a cylindrical region, which is supported on the step, and an inwardly projecting collar, one end of the vapor shield being flanged onto the collar.

Abstract: On both sides of a metal switching chamber, the novel vacuum switch tubes are respectively provided with two ceramic insulators (63, 64; 65, 66) which have the same diameter (D2). Axially interspaced (Al) cylindrical vapor shields (70, 73; 71, 74) are fixed to the wing parts of said components. The easy to produce low-volume structure means that is possible to control operating voltages of more than 60 kV.