Abstract: 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.

Abstract: 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.

Abstract: A support module (10) for polarization resistors of an on-load tap changer comprises:—a supporting region (11) for at least one polarization resistor; —a first joint region (13); —a second joint region (14) which is compatible with the first joint region. A support frame (19) for polarization resistors of an on-load tap changer comprises:—two such support modules which are joined by virtue of the second joint region of the first support module bearing at least partially against the first joint region of the second support module. A fastening element (24) for polarization resistors (22) comprises:—two electrically conductive accommodating sections (25), which each have an accommodating opening (27) for one of the ends (23) of a polarization resistor (22);—an electrically conductive connecting section (26), which connects the two accommodating sections (25) mechanically and electrically to one another;—a first piece (28.1), which comprises the first accommodating section (25.

Abstract: 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.

Abstract: 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.

Abstract: A support module (10) for polarization resistors of an on-load tap changer comprises:—a supporting region (11) for at least one polarization resistor;—a first joint region (13);—a second joint region (14) which is compatible with the first joint region. A support frame (19) for polarization resistors of an on-load tap changer comprises:-two such support modules which are joined by virtue of the second joint region of the first support module bearing at least partially against the first joint region of the second support module.

Abstract: A tap-changer selector for uninterrupted switching between two winding taps of a tapped transformer has fixed contacts arranged circularly in several horizontal planes at a selector housing and a centrally extending rotatable drive shaft in an interior of the selector housing and in each of the horizontal planes of the fixed contacts carries at least one movable contact for connection thereof. The selector housing consists of a plurality of honeycomb segments, and the honeycomb segments are arranged adjacent to one another in the circle in a horizontal plane. A plurality of honeycomb segments arranged in a plane in the circle are arranged vertically one above the other and the honeycomb segments have mounting regions and are so interconnectible by these mounting regions to form when at least two honeycomb segments are connected a mechanically positive connection between at least two mounting regions of the individual honeycomb segments.

Abstract: The invention relates to a selector for a tap changer for switching among winding taps of a step transformer without interruption, wherein the selector consists of a plurality of honeycomb segments arranged horizontally one over the other and vertically next to each other, which honeycomb segments can be fixed to each other by contact holders and pins. According to the invention, by means of such a modular design, a large variety of selector variants is possible using only few components.