ABB S.p.A.

A transfer apparatus for a dual-power transfer switch and an associated dual-power transfer switch. The transfer switch includes a pair of pushing members adapted to be moved in opposite directions to control circuit breakers for the dual-power transfer switch in a mutually different manner; a transmission arm rotatably arranged between the pair of pushing members; a pair of pins arranged on radial ends of the transmission arm; and a pair of elastic reset components arranged on the pair of pushing members.

A low-voltage switching apparatus is disclosed which comprises a switching device having one or more switch poles. Each switch pole comprises first and second pole terminals that can be coupled with corresponding line conductors of an electric line; a fixed contact assembly is connected to the first pole terminal and includes first fixed contacts and second fixed contacts electrically insulated from the first fixed contacts; and a movable contact assembly connected to the second pole terminal and including first movable contacts and second movable contacts. The switching apparatus comprises, for each switch pole, a current limiter connected with the second fixed contacts and the first pole terminal of the switch pole. Each current limiter is configured to limit a current flowing along a series circuit including at least the second fixed contacts, the current limiter and the first pole terminal, during an opening maneuver of the switching device.

A low and/or medium voltage electrical pole which comprises a fixed contact and a movable contact with means for moving the movable contact along a longitudinal axis between open and closed positions. The electrical pole also comprises an insulating assembly comprising a first barrier and a second barrier. The first barrier has first and second insulating walls separated from each other and the second barrier has a third insulating wall. The first and second barriers are positioned around an axis which is substantially perpendicular to said longitudinal axis. At least one of said first and second barriers is movable around said transversal axis between a first position and a second position. When the movable contact is in the closed position, the first and second barriers are in said first position and when the movable contact is in the open position, the first and second barriers are in the second position.

The present disclosure relates to a protection device for a DC electric grid. The protection device comprises a first terminal for coupling to a first branch portion of an electric grid and a second terminal for coupling to a second branch portion of an electric grid. The protection device further comprises a switching assembly including one or more switching devices and a magnetic device electrically connected in series with said switching assembly between the first and second terminals of said protection device. The magnetic device has an inductance value that can vary in operation depending on the current flowing through said protection device.

A DC electric grid comprising a plurality of electric nodes, one or more electric branches electrically connecting said electric nodes and a plurality of protection devices arranged at said electric branches. Each protection device comprises a first terminal for coupling to a first branch portion and a second terminal for coupling to a second branch portion. Each protection device further comprises a switching assembly including one or more switching devices and a magnetic device electrically connected in series with said switching assembly between the first and second terminals of said protection device. The electric grid further includes one or more control devices included in or operatively coupled to the above-mentioned protection devices. Each control device is configured to control one or more switching devices of the switching assembly of one or more protection devices to cause said switching devices to switch selectively between a closed state and open state.

Described herein is a method for determining a presence of anomalous conditions in a switching apparatus installed in an electric line of an electric power distribution grid. The method includes a sequence of steps for adjusting a lumped-parameter model describing, for each electric phase, the behavior of the switching apparatus during the opening maneuvers of the switching apparatus. Simulation values provided by the lumped-parameter model are used for calculating estimation values indicative of the amounts of arc energy released by the breaking components of the switching apparatus during the opening maneuvers of the switching apparatus.

A mechanism for an electrical device, including a plurality of metal parts which are not arranged for conducting an electrical current of which a first part includes a first contact surface and a second part includes a second contact surface arranged to move in relation to, and in contact with, the first contact surface. At least one of the first and second parts includes a Graphene and Related Materials (GRM) at its contact surface, in a metal-GRM composite.