Abstract: A switchgear which includes at least one three-position disconnector arranged in a gas-tight space of a frame. Each phase of the disconnector includes first, second, and third fixed contacts and a moving contact. The first fixed contact is directly connected to a main busbar, so that the conductive main circuit has shorter wiring, saving floor space, and conductor materials. An outer surface of the moving contact is provided with a slot extending in an axial direction to accommodate rolling elements, which guide the moving contact to move through the second fixed contact and prevent it from rotating. The moving contact is provided with grooves, which accommodate contact pieces to realize connection with the corresponding fixed contact. The moving contact of each disconnector is coupled to the same drive shaft so that it is connected to an external operating mechanism via only one sealing point on the frame.

Abstract: A switchgear which includes at least one three-position disconnector arranged in a gas-tight space of a frame. Each phase of the disconnector includes first, second, and third fixed contacts and a moving contact. The first fixed contact is directly connected to a main busbar, so that the conductive main circuit has shorter wiring, saving floor space, and conductor materials. An outer surface of the moving contact is provided with a slot extending in an axial direction to accommodate rolling elements, which guide the moving contact to move through the second fixed contact and prevent it from rotating. The moving contact is provided with grooves, which accommodate contact pieces to realize connection with the corresponding fixed contact. The moving contact of each disconnector is coupled to the same drive shaft so that it is connected to an external operating mechanism via only one sealing point on the frame.

Abstract: A bus bar system and an apparatus for bus bar connection. The bus bar system includes a plurality of members, and a component configured to couple the plurality of members to form a connection portion having a cavity. Further, the component is arranged in the cavity such that it is possible to achieve a significant reduction in the number of parts for bus bar connection without requiring a large number of screws or electric field shieldings.

Abstract: Embodiments of a disconnector and a switchgear, wherein the disconnector comprises a contact assembly operable to change a status of a circuit, the disconnector arranged in the circuit; shafts adapted to be driven to rotate to operate the contact assembly; and a transmission unit arranged between the shafts and comprising: a plurality of gears coupled to the shafts to enable the shafts to rotate with a mutual engagement of the plurality of gears; and a holding assembly adapted to hold radial positions of the plurality of gears to ensure the mutual engagement of the plurality of gears. By arranging the holding assembly to hold the radial positions of the gears to ensure the mutual engagement of the plurality of gears, only one input shaft and one transmission unit are enough to transmit large torques sufficient to operate the contact assembly.

Abstract: Embodiments of a disconnector and a switchgear, wherein the disconnector comprises a contact assembly operable to change a status of a circuit, the disconnector arranged in the circuit; shafts adapted to be driven to rotate to operate the contact assembly; and a transmission unit arranged between the shafts and comprising: a plurality of gears coupled to the shafts to enable the shafts to rotate with a mutual engagement of the plurality of gears; and a holding assembly adapted to hold radial positions of the plurality of gears to ensure the mutual engagement of the plurality of gears. By arranging the holding assembly to hold the radial positions of the gears to ensure the mutual engagement of the plurality of gears, only one input shaft and one transmission unit are enough to transmit large torques sufficient to operate the contact assembly.

Abstract: Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker.

Abstract: Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker.

Abstract: Embodiments of the present disclosure disclose a main bus-bar. The main bus-bar consists of a first elongated flat portion and a second elongated flat portion. A longitudinal side of the first elongated flat portion and a longitudinal side of the second elongated flat portion are arranged to be joined with each other at a predetermined angle. The thickness of each of said the first elongated flat portion and the second elongated flat portion is non-uniform. With embodiments of the present disclosure, the skin effect and proximity effect caused by current carried in the main bus-bar can be reduced greatly. Embodiments of the present disclosure also disclose a transfer connector, a bus-bar assembly and a bus-bar system.