A sensor system for determining physical variables of a switchgear assembly having a sensor connection, which is designed for connection to the switchgear assembly, within which a humidity sensor and/or a pressure sensor and a light sensor for detecting light flashes are arranged. A switchgear assembly is provided that is filled, in particular, with a protective gas, comprising at least one such sensor system.

A high-frequency signal switching apparatus and a testing apparatus are provided. The switching apparatus comprises at least one switching module comprising a first input port; a second input port; a plurality of output ports; a primary-stage switching element group comprising at least a first primary-stage switch and a second primary-stage switch, and a final-stage switching element group comprising a plurality of final-stage switches; wherein a head-end interface of the first primary-stage switch is electrically connected to the first input port, a head-end interface of the second primary-stage switch is electrically connected to the second input port; and each final-stage switch is optionally electrically connected to the first primary-stage switch, the second primary-stage switch, and two of the plurality of output ports simultaneously, thereby the two output ports being respectively and optionally electrically connected to the first input port and the second input port.

A high-frequency signal switching apparatus and a testing apparatus are provided. The switching apparatus comprises at least one switching module comprising a first input port; a second input port; a plurality of output ports; a primary-stage switching element group comprising at least a first primary-stage switch and a second primary-stage switch, and a final-stage switching element group comprising a plurality of final-stage switches; wherein a head-end interface of the first primary-stage switch is electrically connected to the first input port, a head-end interface of the second primary-stage switch is electrically connected to the second input port; and each final-stage switch is optionally electrically connected to the first primary-stage switch, the second primary-stage switch, and two of the plurality of output ports simultaneously, thereby the two output ports being respectively and optionally electrically connected to the first input port and the second input port.

A switching apparatus includes one or more electric pole units, each electric pole unit comprising a fixed contact, a movable contact, a first pole terminal, a second pole terminal, and a motion transmission arrangement to reversibly move the movable contact. The motion transmission arrangement includes a conductive motion transmission member coupled to the movable contact. The first pole terminal is in electrical connection to the fixed contact while the second pole terminal includes a first coupling region in electrical connection with a second coupling region of the conductive motion transmission member. Each electric pole unit further includes a shielding element formed by a conductive hollow body and arranged in a relative fixed position with respect to the second pole terminal and the motion transmission member. The shielding element is arranged to at least partially surround the first coupling and the second coupling region.

A switching apparatus includes one or more electric pole units, each electric pole unit comprising a fixed contact, a movable contact, a first pole terminal, a second pole terminal, and a motion transmission arrangement to reversibly move the movable contact. The motion transmission arrangement includes a conductive motion transmission member coupled to the movable contact. The first pole terminal is in electrical connection to the fixed contact while the second pole terminal includes a first coupling region in electrical connection with a second coupling region of the conductive motion transmission member. Each electric pole unit further includes a shielding element formed by a conductive hollow body and arranged in a relative fixed position with respect to the second pole terminal and the motion transmission member. The shielding element is arranged to at least partially surround the first coupling and the second coupling region.

A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

Transformer assembly has an input terminal, principal housing with main chamber for high voltage coil(s) having plurality of taps, low voltage coil(s) and retaining oil. An auxiliary housing extends outwardly from principal housing and is fluidly connected to main chamber so that auxiliary housing contains oil. A potential transformer; load tap changer having a controller, a motor and a plurality of switches; electrical wiring connected to taps, switches within auxiliary housing chamber are submerged by oil within auxiliary chamber; load tap change controller can adjust taps while the switches and electrical connections are submerged in oil of auxiliary housing chamber. The upper level of oil in the main housing chamber is at a level equal to or above the switches of the load tap changer. The auxiliary housing has an access opening and cover. System apparatus with frames, having beams, lattices and cable guides for routing cables for assembly.

A permanent magnet drive on-load tap-changing switch including a changing switch circuit and a high-speed mechanism. The circuit includes structurally identical odd and even-numbered tap-changing switch circuits. The mechanism includes a traveling mechanism used for bearing a moving contactor, a moving magnet group connected with the traveling mechanism, and a fixed magnet group producing an attracting/repelling force with respect to the moving magnet group. The moving magnet group includes a first and second permanent magnet connected at homonymic magnetic poles. An exposed homonymic magnetic pole of the first and the second permanent magnet face directly the fixed magnet group. The fixed magnet group includes a rotating permanent magnet that rotates to change a force applied to the moving magnet group, allowing the moving contactors to either come into contact with or be separated from working contactors and dual-contact synchronous transition contactors.

The invention relates to a method for monitoring an on-load tap changer that is used to switch between winding taps of a tapped transformer without interrupting the load current and is actuated using a motor drive. According to the invention, prior to the actual load switching process, the on-load tap changer is initially moved a short distance, preferably against the direction in which the load is subsequently switched. In said initial process, it is verified whether the on-load tap changer has moved, i.e. has left its previous stationary position, and/or whether the torque on the motor drive has exceeded a predefined threshold value. The actual load switching process takes place only once the test has yielded a positive result.

A load or a generator is connected to an energy line, e.g. a ring feeder of an energy distribution network by using a switching system. For this purpose, the switching system has a thyristor circuit, which is connected in parallel to a disconnect switch and connects the transformer of the switching system to an energy line. Thereby an efficient disconnect switch can be realized, which can be dimensioned depending on the power of the load or generator.