Abstract: A Branch busbar device for high voltage arrangements, whereby the branch busbar device comprises a first electric line with a first electric contact area and a second electric line with a second electric contact area, whereby the first electric contact area is connected to the second electric contact area, whereby a first field limiting part is arranged at a first place adjacent to the contact areas, a second field limiting part is arranged at a second place adjacent to the contact areas, and the first field limiting part and the second field limiting part are electrically connected to the first electric line or to the second electric line or to a third electric line of the branch busbar device is provided.

Abstract: A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

Abstract: A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

Abstract: A ground support system (1) for an aircraft having a turbine engine, which ground support system comprises; an intermittent combustion engine (2), a generator (3) which is driven by the combustion engine to supply electrical power with a constant frequency, an electricity cable (4) to transport the electrical power to the aircraft, an air pump (5) which is driven by the combustion engine to supply pressurised air, an air duct (6) to transport the pressurised air to the aircraft, a control unit (7) to control the operation of the ground support system (1), which control unit (7) communicates with the combustion engine (2) to let the combustion engine run at a predetermined engine rotational speed, and wherein the air pump (5) is driven by the combustion engine (2) via an adjustable transmission (16) to adjust an air flow rate of the pressurised air supplied by the air pump (5), while the combustion engine (2) remains running at the predetermined engine rotational speed.

Abstract: Disconnector for switchgear, having a first contact position, in which a contact is between main and first terminals, and a second contact position, in which a contact is between the main and second terminal. The disconnector includes a connector body moveable in a first direction between the first and second positions and having an end extendable in a direction substantially perpendicular to the first direction for providing a contact force between the end and the first, second or main terminals, a first operating mechanism arranged to move the body between the first and second positions, and a second operating mechanism arranged to extend the end when the disconnector is in either the first or second contact positions, in which the end includes a conical inside surface and the second operating mechanism includes a first shaft having a first conically shaped end positioned inside the conical inside surface.

Abstract: A ground support system (1) for an aircraft having a turbine engine, which ground support system comprises; an intermittent combustion engine (2), a generator (3) which is driven by the combustion engine to supply electrical power with a constant frequency, an electricity cable (4) to transport the electrical power to the aircraft, an air pump (5) which is driven by the combustion engine to supply pressurised air, an air duct (6) to transport the pressurised air to the aircraft, a control unit (7) to control the operation of the ground support system (1), which control unit (7) communicates with the combustion engine (2) to let the combustion engine run at a predetermined engine rotational speed, and wherein the air pump (5) is driven by the combustion engine (2) via an adjustable transmission (16) to adjust an air flow rate of the pressurised air supplied by the air pump (5), while the combustion engine (2) remains running at the predetermined engine rotational speed.

Abstract: Disconnector for switchgear, having a first contact position, in which a contact is between main and first terminals, and a second contact position, in which a contact is between the main and second terminal. The disconnector includes a connector body moveable in a first direction between the first and second positions and having an end extendable in a direction substantially perpendicular to the first direction for providing a contact force between the end and the first, second or main terminals, a first operating mechanism arranged to move the body between the first and second positions, and a second operating mechanism arranged to extend the end when the disconnector is in either the first or second contact positions, in which the end includes a conical inside surface and the second operating mechanism includes a first shaft having a first conically shaped end positioned inside the conical inside surface.

Abstract: Disconnector for switchgear, having a first contact position, in which a contact is between main and first terminals, and a second contact position, in which a contact is between the main and second terminal. The disconnector includes a connector body moveable in a first direction between the first and second positions and having an end extendable in a direction substantially perpendicular to the first direction for providing a contact force between the end and the first, second or main terminals, a first operating mechanism arranged to move the body between the first and second positions, and a second operating mechanism arranged to extend the end when the disconnector is in either the first or second contact positions, in which the end includes a conical inside surface and the second operating mechanism includes a first shaft having a first conically shaped end positioned inside the conical inside surface.

Abstract: A switching installation including a gas-filled enclosure, an input conductor, an actuator and a short-circuit device. The actuator is arranged to actuate the short-circuit device upon the occurrence of a first arc in the enclosure. The short-circuit device creates, upon being actuated, a short-circuit through the solid insulation between the input conductor and the enclosure or a separate ground point. The actuator can be arranged to react on an increase in pressure in the enclosure upon the occurrence of the first arc. The gas can be air or SF6. The short-circuit device can create, upon being actuated, the short-circuit through a section of a solid cable insulation isolating the input conductor from the enclosure.

Abstract: Cooling arrangement for an electrically conductive element in an electrical installation. A casting body (3) is provided for electrically isolating the electrically conductive element (2). The casting body has an outer wall, part of which forms a contact surface 5 (5) for contact with a heat conducting surface (1) of the electrical installation. The outer wall of the casting body (3) is provided with an electrically conductive layer (4; 7) at its outer surface.

Abstract: Switching device assembly for providing a switching function in a medium voltage switchgear system. A switching device (10) is positioned in a switching device housing (11). Terminals (14, 15) are connected to the switching device (10) and receiving ends (24, 25) thereof are provided for receiving an interface surface (26, 27) of respective conductor terminals (20, 21) of the medium voltage switchgear. Mounting assemblies are arranged to releasably fasten the terminals (14, 15) to the respective conductor terminals (20, 21) in operation. A switching device drive unit (30), to which the switching device housing (11) is mounted, is provided with sealable access points (31, 32), through which the mounting assemblies are reachable when opened.

Abstract: A switching installation including a gas-filled enclosure having an input conductor, an actuator and an arc initiator. The actuator is arranged to actuate the arc initiator upon the occurrence of a first arc with a first length in the enclosure. The arc initiator creates, upon being actuated, a path for a second arc of a second length, the second length being shorter than the first length. The actuator can be arranged to react on an increase in pressure in the enclosure upon the occurrence of the first arc. The gas can be air or SF6. The arc initiator can create, upon being actuated, the path for the second arc through a section of a solid cable insulation isolating the input conductor from the enclosure.

Abstract: A switching installation including a gas-filled enclosure, an input conductor, an actuator and a short-circuit device. The actuator is arranged to actuate the short-circuit device upon the occurrence of a first arc in the enclosure. The short-circuit device creates, upon being actuated, a short-circuit through the solid insulation between the input conductor and the enclosure or a separate ground point. The actuator can be arranged to react on an increase in pressure in the enclosure upon the occurrence of the first arc. The gas can be air or SF6. The short-circuit device can create, upon being actuated, the short-circuit through a section of a solid cable insulation isolating the input conductor from the enclosure.

Abstract: Disconnector for switchgear, having a first contact position, in which a contact is between main and first terminals, and a second contact position, in which a contact is between the main and second terminal. The disconnector includes a connector body moveable in a first direction between the first and second positions and having an end extendable in a direction substantially perpendicular to the first direction for providing a contact force between the end and the first, second or main terminals, a first operating mechanism arranged to move the body between the first and second positions, and a second operating mechanism arranged to extend the end when the disconnector is in either the first or second contact positions, in which the end includes a conical inside surface and the second operating mechanism includes a first shaft having a first conically shaped end positioned inside the conical inside surface.

Abstract: Switching device assembly for providing a switching function in a medium voltage switchgear system. A switching device (10) is positioned in a switching device housing (11). Terminals (14, 15) are connected to the switching device (10) and receiving ends (24, 25) thereof are provided for receiving an interface surface (26, 27) of respective conductor terminals (20, 21) of the medium voltage switchgear. Mounting assemblies are arranged to releasably fasten the terminals (14, 15) to the respective conductor terminals (20, 21) in operation. A switching device drive unit (30), to which the switching device housing (11) is mounted, is provided with sealable access points (31, 32), through which the mounting assemblies are reachable when opened.

Abstract: Cooling arrangement for an electrically conductive element in an electrical installation. A casting body (3) is provided for electrically isolating the electrically conductive element (2). The casting body has an outer wall, part of which forms a contact surface 5 (5) for contact with a heat conducting surface (1) of the electrical installation. The outer wall of the casting body (3) is provided with an electrically conductive layer (4; 7) at its outer surface.

Abstract: A switching installation (5) having a circuit breaker (12), which is connected to a cable connection (33), and optionally a disconnector (14) for making or breaking a conductive connection between the cable connection (33) and a rail system (15), and an electrically insulating barrier (10). The electrically insulating barrier (10) surrounds at least the parts which are under electric voltage in operation from the circuit breaker (12) to the rail system (15), including a branch (18) leading to a rail (15) of the rail system, separately for each phase of the switching installation (5). Furthermore, inside the electrically insulating barrier (10) the switching installation may be provided with field-control means and/or voltage-sealing means (22, 25, 37).

Abstract: Electromagnetic actuator for operating at least one movable contact of a switch into a switched-on position or a switched-off position. The electromagnetic actuator (1) has a first magnetic circuit for making a movable (3) and a fixed (4) pole body move towards one another and a second magnetic circuit, separate from the first magnetic circuit, with a permanent magnet (9) and a retaining plate (10). A switching-off coil (15) operates to counteract the magnetic field in the second magnetic circuit so that the actuator (1) can return to a switched-off position. In the axial direction of the actuator (1), the switching-off coil (15) is positioned Gloser to the retaining plate (10) than the permanent magnet (9), as a result of which more effective operation of the actuator is possible. Furthermore, the actuator is constructed from cylindrical elements that are easy to produce and to assemble.

Abstract: Single phase or polyphase switchgear having one or more switches which are mounted with the aid of solid insulation such that they are insulated, as well as associated live components such as rail systems, connectors and the like. Both the switches and the associated live components are housed in a housing enveloping the switches and live components. The enveloping housing is filled with air having a low moisture content and the interior space thereof is sealed with respect to the exterior space around the enveloping housing in such a way that the air present in the housing is not contaminated and will not reach the dew point.

Abstract: Single phase or polyphase switchgear comprising one or more switches which are mounted with the aid of solid insulation such that they are insulated, as well as associated live components such as rail systems, connectors and the like. Both the switches and the associated live components are housed in a housing enveloping said switches and live components. The enveloping housing is filled with air having a low moisture content and the interior space thereof is sealed with respect to the exterior space around the enveloping housing in such a way that the air present in the housing is not contaminated and will not reach the dew point.