Abstract: A bellows protector for a vacuum interrupter with an external bellows for low, medium or high voltages has a first region, which is configured tapered and to receive a moving contact rod such that the moving contact rod is guided out of the bellows protector from an inner side of the bellows protector onto a second side outside the bellows protector. The tapered first region of the bellows protector is configured to lie against the moving contact rod such that the moving contact rod is guided through the bellows protector. A second region adjoins the first region, the second region is enlarged relative to the first region such that the bellows to be protected is received in the second region. A holding region is configured to fasten the bellows protector on or to the vacuum interrupter such that the bellows protector forms a guide for the moving contact rod.

Abstract: A vacuum interrupter arrangement may be used in a tap changer. The vacuum interrupter arrangement has a vacuum interrupter; a metal shield configured to shield against external magnetic fields, the metal shield having a hollow cylindrical design and being arranged around at least a part of a cylindrical outer surface of the vacuum interrupter; and a holder, which is arranged on the outside of the metal shield and the vacuum interrupter, and which surrounds the metal shield and the vacuum interrupter at least partially coaxially. The holder has a plurality of holding elements which hold the metal shield in position relative to the vacuum interrupter.

Abstract: An on-load tap-changer of a tap-changing transformer has a switch. The switch has: a take-off contact; a primary fixed contact; and a contact unit. The contact unit has a moving contact, a first arcing contact and a second arcing contact. These contacts are pivotable about a pivot axis during a switchover process such that the contacts assume a first position, in which they make contact with the take-off contact and the primary fixed contact, and a second position, in which they are separated from the take-off contact and the primary fixed contact. The second arcing contact assumes the first position before the first arcing contact when switching over from the second position to the first position and leaves the first position after the first arcing contact when switching over from the first position to the second position.

Abstract: A vacuum interrupter arrangement may be used in a tap changer. The vacuum interrupter arrangement has a vacuum interrupter; a metal shield configured to shield against external magnetic fields, the metal shield having a hollow cylindrical design and being arranged around at least a part of a cylindrical outer surface of the vacuum interrupter; and a holder, which is arranged on the outside of the metal shield and the vacuum interrupter, and which surrounds the metal shield and the vacuum interrupter at least partially coaxially. The holder has a plurality of holding elements which hold the metal shield in position relative to the vacuum interrupter.

Abstract: An on-load tap-changer of a tap-changing transformer has a switch. The switch has: a take-off contact; a primary fixed contact; and a contact unit. The contact unit has a moving contact, a first arcing contact and a second arcing contact. These contacts are pivotable about a pivot axis during a switchover process such that the contacts assume a first position, in which they make contact with the take-off contact and the primary fixed contact, and a second position, in which they are separated from the take-off contact and the primary fixed contact. The second arcing contact assumes the first position before the first arcing contact when switching over from the second position to the first position and leaves the first position after the first arcing contact when switching over from the first position to the second position.

Abstract: A diverter switch is for an on-load tap-changer. The diverter switch includes: at least one vacuum interrupter; an actuating element, which is mechanically connected at a first end of the vacuum interrupter and has a roller at a second end; and an actuating body having a base body and having at least one cam. The vacuum interrupter is configured to be actuated via the actuating element as a result of the roller moving over the actuating body. At least one part of the cam has a higher strength than the base body.

Abstract: A diverter switch is for an on-load tap-changer. The diverter switch includes: at least one vacuum interrupter; an actuating element, which is mechanically connected at a first end of the vacuum interrupter and has a roller at a second end; and an actuating body having a base body and having at least one cam. The vacuum interrupter is configured to be actuated via the actuating element as a result of the roller moving over the actuating body. At least one part of the cam has a higher strength than the base body.

Abstract: A switch includes a diverter contact; a primary fixed contact; and a secondary fixed contact. The switch additionally includes a primary movable contact configured to be pivoted, relative to the diverter contact and the primary fixed contact, about a pivot axis between a first end position and a second end position. In the first end position, the primary movable contact bears by a first contact point against the diverter contact and by a second contact point against the primary fixed contact. The switch further includes a secondary movable contact configured to be pivoted, relative to the diverter contact and the secondary fixed contact, about the pivot axis between a first end position and a second end position. In the first end position the secondary movable contact bears by a third contact point against the diverter contact and by a fourth contact point against the secondary fixed contact.

Abstract: A switch includes a diverter contact; a primary fixed contact; and a secondary fixed contact. The switch additionally includes a primary movable contact configured to be pivoted, relative to the diverter contact and the primary fixed contact, about a pivot axis between a first end position and a second end position. In the first end position, the primary movable contact bears by a first contact point against the diverter contact and by a second contact point against the primary fixed contact. The switch further includes a secondary movable contact configured to be pivoted, relative to the diverter contact and the secondary fixed contact, about the pivot axis between a first end position and a second end position. In the first end position the secondary movable contact bears by a third contact point against the diverter contact and by a fourth contact point against the secondary fixed contact.

Abstract: A load selector has a load changeover switch insert with a switching tube rotatable about an axis, at least one switching segment fastened to the switching tube, and at least two vacuum interrupters in the at least one switching segment. Each vacuum interrupter has a switching tube having a respective axially movable contact that cooperates at its free end with an actuating lever. The vacuum interrupters are so arranged in alternation in opposite sense that the movable contacts of the at least two vacuum interrupters are movable with respect to the axis alternately in opposite directions.

Abstract: An on-load tap changer has a switching tube, an oil suction pipe arranged centrally and coaxially along an axis inside the switching tube, and a kerosene drain screw so mounted in a base of the on-load tap changer that it is coaxial with an axis of the oil suction pipe, with the axis of the switching tube, and with an axis of the on-load tap changer. A bearing ring is so acted on by a resilient element at one side and radially with respect to the axis of the on-load tap changer that the switching tube and the oil suction pipe both mechanically positively cooperate with the bearing ring and are centered about the axis of the on-load tap changer.

Abstract: A load selector for tapped transformers has an oil tank and a preselector having a first preselector contact and a second preselector contact for each phase to be switched by the load selector. The first preselector contact and the second preselector contact are mounted on a wall of the oil tank and extending through the wall of the oil tank. A first zero contact and a second zero contact separate from the first zero contact are provided for each phase to be switched by the preselector. The first zero contact and the second zero contact are each mounted on the wall of the oil tank and extend through the wall of the oil tank.

Abstract: An on-load tap changer has a load changeover switch insert having a switching tube rotatable about an axis, at least one switching module associated with the switching insert and having at least one switching segment fastened to the switching tube, an oil tank, and a resistor subassembly having a plurality of separate and identical resistors. An actuating arrangement associated with the switching module at an inner wall of the oil tank has a plurality of identical actuators associated with the switching module at the inner wall of the oil tank. The on-load tap changer is a load selector or a load changeover switch depending on the arrangement of the at least one identical switching segment, the resistor subassembly, and the mounting of the plurality of identical actuators at the inner wall of the oil tank.

Abstract: A position indicator for a tap changer of a tapped transformer comprises a display device (51) for displaying the current switch position of the tap changer, which display device (51) is stepped with each switchover and which comprises first and second display disks (21, 26); an indicator gear (10) that is coupled to the two display disks (21, 26) for driving them in a switch-direction-dependent manner and which can be coupled to a switching shaft of the tap changer; wherein each display disk (21, 26) comprises sets of numbers in an angularly extending or circular row; with each step one number of the row of numbers on the first display disk (21) and one number of the row of numbers on the second display disk (26) are positioned side by side such that these numbers represent the current switch position of the tap changer expressed as digits combined to form a multi-digit number.

Abstract: Arrangement of vacuum switching tubes (3, 3a, 3b) in a load transfer switch (1), wherein in each case one cam controller (5) comprising a control cam (7) and a lever bearing (10) for operating a moving contact (13) is associated with in each case one of the vacuum switching tubes (3, 3a, 3b), wherein at least one camshaft (15a, 15b) is arranged axially parallel to a drive shaft (11) and can be driven by means of said drive shaft, and wherein each axis (A) of the moving contact (13) of each vacuum switching tube (3, 3a, 3b) is arranged perpendicular to an axis (E) of the respective camshaft (15a, 15b).

Abstract: What is disclosed is: an on-load tap changer (1). The on-load tap changer (1) comprises a diverter switch insert (14) and a vacuum interrupter (15), which is rotatable about an axis (A) and to which at least one switching module (24) is assigned. The switching module (24) comprises at least one switching segment (25) fastened on the vacuum interrupter (15) and an associated resistor arrangement (27). An actuating arrangement (41) is assigned to the switching module (24) on an inner wall (20) of an oil tank (18). In accordance with the invention, the resistor arrangement (27) has a plurality of resistor elements (28). In addition, the actuating arrangement (41) comprises a plurality of physically identical actuating elements (50), which are assigned to the switching module (24) on the inner wall (20) of the oil tank (18).

Abstract: The invention relates to an on-load tap changer (1), comprising a load transfer switch insert (14) and an oil suction pipe (60), and to a method for installing a load transfer switch insert (14) by means of the switching tube (15) and the oil suction pipe (60). The oil suction pipe (60) is arranged centrally, and coaxially along an axis (A) of the on-load tap changer (1), within the switching tube (15). The on-load tap changer (1) has a kerosene drain screw (70), which is attached in a bottom (21) of the on-load tap changer (1) in such a way that the kerosene drain screw is arranged coaxial to the axis (C) of the oil suction pipe (60), to the axis (B) of the switching tube (15), and to the axis (A) of the on-load tap changer (1).

Abstract: The invention relates to a load selector (1), comprising: a load transfer switch insert (14) having a switching tube (15) that can be rotated about an axis (A); at least one switching segment (25) fastened to the switching tube (15); and at least two vacuum interrupters (33, 34). The vacuum interrupters (33, 34) are arranged in the at least one switching segment (25). Each vacuum interrupter (33) has a movable contact in the direction of the axis (A) of the switching tube (15), which movable contact interacts with an actuating lever (45) at a free end (331) of the movable contact. According to the invention, the vacuum interrupters (33, 34) are arranged in alternately opposite directions in such a way that the movable contacts of the at least two vacuum interrupters (33, 34) can be moved in alternately opposite directions with respect to the axis (A).

Abstract: The invention relates to a selector switch (1) for tap-changing transformers. The selector switch (1) has a tap selector (37) in the oil tank (18) of said selector switch (1). In accordance with the invention, two separate zero contacts (73, 74) belong to each phase (L1, L2, L3) to be switched by the tap selector (37). The zero contacts (73, 74) are each arranged on a wall (17) of the oil tank (18) and reach through the wall (17). The invention also relates to a support arm (62) of a tap selector (37) of a selector switch (1). The support arm (62) has a first lateral rib (65) and a second lateral rib (66) and at least one web-like elevation (67) extending along a length (L) of the support arm (62) is formed between the first lateral rib (65) and the second lateral rib (66).

Abstract: A tap changer with vacuum-switching tubes for controlling a transformer having taps has a selector for power-free selection of a one of the taps to be switched and a load-changeover switch for actual switching over from the connected tap to a new, pre-selected one of the taps. A first cam disk is fixed against rotation on a rotatable switch shaft, and a rocker lever arrangement has a first roller for actuating the vacuum-switching tubes. A second cam disk is also rotationally fixed on the switch shaft, and there are two further arms of U-shaped construction on the rocker lever arrangement. A lever has a free end provided with a second roller that co-operates with the second cam disk. This lever is between the further arms and mounted to be rotatable about an axis. A compression spring is provided between the lever and the further arms.