Abstract: A switching device for the interruption of a fault current includes a housing having first and second electrical connectors for connection in the path of an electrical conductor carrying a single current phase. A vacuum switching chamber is disposed in the housing. A current transformer disposed in the housing includes a primary circuit connected between the first and second terminals for conducting the single current phase and inducing a corresponding current in a secondary winding. A magnet actuator disposed in the housing is electrically coupled to the transformer secondary winding. The magnet actuator is responsive to a fault current in the transformer primary, by way of the corresponding current in the secondary, for changing from an inactive state to an actuated state.

Abstract: An arrangement is provided for supporting a power switch on a wall of a switch drive housing. A power switch having an axial direction and including connecting members for connection to external electrical conductors is disposed in a switch chamber formed in a one-piece profiled strand of insulating material extending in the axial direction of the power switch with a generally unchanging cross section. The strand is mounted to the wall of the switch drive housing and includes a rear wall adjacent and parallel to, and spaced from the wall of the switch drive housing when the strand is mounted on the wall of the switch drive housing, opposing side walls connected to and oriented generally perpendicular to the rear wall, a front wall remote from the wall of the switch drive housing relative to the rear wall, parallel to the rear wall and connected to the side walls to define with the side walls and the rear wall the chamber for accommodating the power switch.

Abstract: A vacuum switch which includes two identical facing switch contacts equipped with a cup shaped coil body that is provided with annular contact elements covering the open end of the cup shaped coil body. In order to form turn conductors, the coil body is penetrated by a plurality of throughgoing slots which are inclined relative to the axis and are distributed symmetrically over the circumference of the coil body. A supporting ring is disposed in the cavity between the bottom of the coil body and the contact element which is formed of circular ring sectors. In order to realize high protection against arcbacks, four of the throughgoing slots are provided and are inclined at an angle between 60.degree. and 75.degree. relative to the axis and extend in the circumferential direction between the contact element and the cup bottom at most over a rotation angle between 60.degree. and 90.degree..

Abstract: An encapsulated and partitioned switching system employing compressed gas insulation. For each bus bar system (I, II, III) there is provided a coupling field (KFI, KFII, KFIII) in which are installed a first bus bar end section (6.sub.I, 6.sub.II, 6.sub.III), at least a first disconnect switch (2) and a coupling switch (3), while a second bus bar end section (7.sub.I, 7.sub.II, 7.sub.III) is always disposed in an adjacent coupling field (KFI, KFII).

Abstract: A contact arrangement for a vacuum switch having a switch axis along which switch contacts move. Two identically configured switch contacts are relatively movable opposite to one another along the switch axis. Each switch contact includes: a contact pin for connecting the switch contact with a switch terminal; a contact plate; and a coil body for generating an axial magnetic field. The coil body has at least one winding section extending circumferentially parallel to the contact plate and has a first end connected with the contact plate and a second end connected by an approximately radial conductor section with the contact pin. The side of the winding section facing the contact plate lies continuously against the contact plate and is connected with the contact plate in a conductive manner over the entire length of the winding section.

Abstract: A metal enclosed multi-phase high voltage switching arrangement filled with compressed gas and provided with an interior protective wall between the bus bar chamber and the switch chamber. The electrical connection between the two chambers is established via gas tight passages or passthroughs arranged diagonally in the protective wall, with the passages being disposed, in one direction, at the spacing between the bus bars and, in the other perpendicular direction, at the spacing of the poles of the high voltage power or load switch in the switch chamber. Straight connections without crossovers are provided in the bus bar chamber between each bus bar and the associated passage via the respective disconnect or three-way position bus bar switch, while the connecting lines in the switch chamber from the passages to the respective poles of the high voltage switch extend in mutually parallel planes, here again without cross-overs.

Abstract: A switch chamber for a vacuum switch including a housing having at least one insulating tube with an end face and an axial axis. A contact pin having an exterior surface is arranged for supporting the switch chamber. A stationary contact is held by the contact pin within the housing and has a frontal face. A movable contact contacts the frontal face of the stationary contact in the on-position of the vacuum switch under the force of a contact spring. A seal including a bellows connects the movable contact with the housing in a vacuum-tight manner. A terminating cover is connected to the insulating tube and to the contact pin in a vacuum-tight manner and transfers to the housing impact forces generated when the vacuum switch is switched on. The insulating tube comprises a ceramic tube.

Abstract: A vacuum switch which has a housing for a vacuum chamber. The housing includes a metal cylinder and an insulating cylinder axially aligned and hermetically sealed at adjacent ends, and closed at opposite ends by end walls. A stationary electrode and a movable electrode are provided in the vacuum chamber, surrounded by the metal cylinder. Stationary and movable electrode lead rods are fixed to the respective electrodes and project in opposite directions from the chamber through the end walls. A magnetic coil whose coil body is molded in an approximately bell-shape and is made of an electrically and thermally conductive material, surrounds the metal cylinder with a winding that is connected by way of an input lead with the electrode lead rod penetrating the end wall closing an end of the metal cylinder. A relatively thick top portion of the coil body is disposed above the end wall and has a rounded upper end, while a less thick cylindrical side wall surrounds the metal cylinder and has a rounded lower end.

Abstract: A switch chamber for a vacuum switch including a housing composed of a ceramic insulating tube, a contact pin mounting a stationary contact within the housing and a terminating cover connecting the insulating tube with the contact pin in a vacuum-tight manner. Another contact is positioned adjacent the stationary contact and is movable in the axial direction of the insulating tube. A bellows forms a vacuum-tight connection between the movable contact and the housing. In the switched-on position the movable contact contacts the stationary contact under action of a contact spring force and shock stresses are transferred to the housing by the terminating cover which includes an elastically deformable section and a plastically deformable section.

Abstract: An electrical switching device for switching high voltages in a network having a defined rated voltage. The device includes a series connection of at least first and second current interrupters having control elements across which a load voltage is distributed. Each interrupter operates according to different quenching principles and exhibits different dielectric behavior immediately after a zero passage of load current to be interrupted. The first interrupter comprises a first switch which has an operating voltage that is low relative to a mains voltage of the network and includes means for interrupting, at relatively low switching voltages without participation of the second interrupter, currents having inductive components.

Abstract: Tensioning device for a driving spring of an energy store for an electrical switch, the device including: a drive shaft carrying a crank articulated to the driving spring; a rotatable tensioning shaft; mechanism connected for rotating the tensioning shaft; at least one overrunning clutch coupled to the drive shaft; and a transmission mechanism connected between the tensioning shaft and the drive shaft for imparting at least one unidirectional stepwise rotational advance to the drive shaft with each revolution of the tensioning shaft, wherein the tensioning shaft and the transmission shaft have respective axes of rotation which are nonparallel to one another.

Abstract: A fault protection system for a power circuit composed of a main current path and a plurality of parallel branch paths connected in series with the main current path and each containing a winding of a medium voltage transformer, which system includes: first and second switchable current interrupters for switching the current flowing through the paths and for protecting the paths against fault currents, the first interrupter being connected in one branch path for interrupting fault currents in a first amplitude range and the second interrupter being connected in the main current path for interrupting fault currents in a second amplitude range which is higher than the first range and includes short circuit currents; and current monitoring circuits connected for monitoring the current in the one branch path and for maintaining the first interrupter in the closed state when the current in the one branch is below the first amplitude range, for placing the first interrupter in the open state in response to the pres