An on-load tap changer of a resistor type includes a selector base plate; a selector mounted on the selector base plate; a diverter switch base plate; a diverter switch mounted on the diverter switch base plate and having a transition resistor; and a common drive shaft which is configured to actuate the selector and the diverter switch.

A switching device for low or medium voltage electric power distribution network, the switching device including one or more electric poles, each electric pole including: an insulating housing extending along a longitudinal axis and fixed to a main support structure of the switching device; a first pole terminal and a second pole terminal electrically connectable with a corresponding phase conductor of an electric power source and with a corresponding load conductor of an electric load, respectively; a movable contact and a fixed contact, which are electrically coupleable or decoupleable one with or from another upon a movement of the movable contact towards or away from the fixed contact, the fixed contact being electrically connected with the first pole terminal, the movable contact being electrically connectable with the second pole terminal; a movable circuit assembly including a plurality of semiconductor devices adapted to switch in a conduction state or in an interdiction state depending on the voltage applied thereto, the semiconductor devices being electrically connected in series one to another in such a way that a current can flow according to a predefined conduction direction when the semiconductor devices are in a conduction state, the movable circuit assembly including first and second assembly terminals for the plurality of semiconductor devices. The movable circuit assembly is operatively coupled with the movable contact and moves together with the movable contact during a movement of the movable contact towards or away from the fixed contact, the semiconductor devices switching in a conduction on state or in an interdiction state depending on the position of the movable contact.

The invention relates to a switch assembly (1), in particular a preselector, for a variable transformer (4) having a first winding (2) and a second winding (3) with a first and a second tap (3.3, 3.4), said switch assembly comprising: a first connection terminal (2.1) that can be connected to the first winding (2); a second connection terminal (3.1) that can be connected to the first tap (3.3); a third connection terminal (3.2) that can be connected to the second tap (3.4); a first, second, third and fourth fixed contact (5.1, 5.2, 5.3, 5.4); a vacuum interrupter (6); a first moving contact (7) that can be contacted selectively with the first or second fixed contact (5.1, 5.2); a second moving contact (8) that can be contacted selectively with the third or fourth fixed contact (5.3, 5.4), wherein the second and the fourth fixed contact (5.2, 5.4) are connected to the second connection terminal (3.1), the first and the third fixed contact (5.1, 5.3) are connected to the third connection terminal (32) the first moving contact (7) is connected to the first connection terminal (2.1) via the vacuum interrupter (6), and the second moving contact (8) is connected to the first connection terminal (2.1).

Assemblies are disclosed that allow a driver to be mounted in association with an electrical gang box. In one embodiment, the gang box has an opening in a bottom panel. The driver has a flange that is larger than the opening and a body that is smaller than the opening. The driver is inserted through the opening so that the flange rests on the interior surface of the bottom panel with at least a majority of the body of the driver extending outside of the gang box. In another embodiment, the gang box has an opening in a side or rear panel and an adapter mounts the driver outside of the gang box. These assemblies allow for the use of low-voltage and other types of electrical components while leaving space in the gang box for conventional electrical elements, such as switches and dimmers.

A switching device for low or medium voltage electric power distribution network, the switching device including one or more electric poles, each electric pole including: an insulating housing extending along a longitudinal axis and fixed to a main support structure of the switching device; a first pole terminal and a second pole terminal electrically connectable with a corresponding phase conductor of an electric power source and with a corresponding load conductor of an electric load, respectively; a movable contact and a fixed contact, which are electrically coupleable or decoupleable one with or from another upon a movement of the movable contact towards or away from the fixed contact, the fixed contact being electrically connected with the first pole terminal, the movable contact being electrically connectable with the second pole terminal; a movable circuit assembly including a plurality of semiconductor devices adapted to switch in a conduction state or in an interdiction state depending on the voltage applied thereto, the semiconductor devices being electrically connected in series one to another in such a way that a current can flow according to a predefined conduction direction when the semiconductor devices are in a conduction state, the movable circuit assembly including first and second assembly terminals for the plurality of semiconductor devices. The movable circuit assembly is operatively coupled with the movable contact and moves together with the movable contact during a movement of the movable contact towards or away from the fixed contact, the semiconductor devices switching in a conduction on state or in an interdiction state depending on the position of the movable contact.

A transformer arrangement includes a transformer, a transformer tank and at least one tap changer that is arranged to be connected to said transformer. The transformer arrangement further includes at least one support structure which is arranged to be connected to the tap changer and to extend between the tap changer and at least two support members located between the tap changer and at least two points on an inner surface of the transformer tank. The at least one support structure is arranged to reduce pendular movement of the tap changer.

A switch can be used for an on-load tap changer. The switch includes: fixed contacts, including a first fixed contact and a second fixed contact; and a moving contact with a first attraction element. The moving contact is movable from a first position into a second position via the first attraction element and a second attraction element, which is arranged outside the switch. The moving contact is configured such that, in the first position, the moving contact contacts neither or only one of the fixed contacts and, in the second position, the moving contact contacts both of the fixed contacts.

A switch unit is for a step transformer. The switch unit has: ]a controller; a motor; and an on-load tap-changer. The controller controls the motor, which actuates the on-load tap-changer. The controller draws energy, required for actuating and controlling the motor, directly from a low voltage winding of the step transformer.

A switching arrangement (1), in particular a polarity switching means, for a control transformer (10) which comprises a first winding (2) for a phase of an AC power supply system, which phase is to be controlled, comprises a first connection terminal (1.1) which can be connected to the winding (2); a second connection terminal (1.2) which can be connected to a discharge line (3); a vacuum interrupter (4); an isolator (5); a resistor (6) which is connected in series with the vacuum interrupter (4) and the isolator (5); wherein the first connection terminal (1.1) is connected to the second connection terminal (1.2) by means of the series circuit.

An electrical device (10, 13), in particular a power transformer (13), a shunt reactor, or an on-load tap changer (10), comprises a housing (101, 131) that is filled or fillable with insulation oil (11, 11); and a sensor (12) that comprises a piezo element (16) in the housing (101, 131) on a level with a minimum fill level (19, 19) of the insulation oil (11, 11); and an evaluation device (18) that is connected to the piezo element (16); wherein the evaluation device (18) is formed such that it can induce an oscillation of the piezo element (16); and it can determine the fill level from a measurement of a characteristic of the oscillation, in particular the half-life period of the amplitude of the oscillation.