HK1202982B - On-load tap changer - Google Patents

Description

The present invention relates to a load step switch for uninterrupted switching between different winding sockets of a step transformer according to the general concept of the first claim.

Load step switches have been used for many years to switch between different winding sockets of step transformers in large numbers worldwide. So-called reactor switches, which are especially common in North America, have a switching reaction that allows for a slow, continuous switching. Load step switches according to the resistance-fast switching principle usually consist of a selector for powerless selection of the respective winding socket of the step transformator to be switched, and a load switch to switch from the current to the new, intermediate switching cycle.

A load-level switch with vacuum switches is shown in DE 10 2009 043 171 A1 for example, where a load switch carries a drive shaft driven by a power storage device with at least one curved disc, the curved disc having several control curves, two control curves placed on the front of the control disc having a contour of a different shape from a circle by type of cams, each of which is connected by a contact wire to a roller connected by a tilt-pin with a control tube, which pulls the profiled vacuum of the respective control curve.

In a special class of load switches, the so-called load switches, the means described for selecting a new winding connection and the means for actual load switching are combined and operated together. Usually, step switches are based on the principle of resistance-speed switching for the uninterrupted switching from one connection of a step transformer to another, so that the fixed step contacts electrically connected to the outputs of the step winding are arranged in one or more horizontal planes or insulated planes on a spring gear or cylinder and are charged by concentric drive waves.

DE 42 37 165 C1 forms the basis for the general concept of claim 1 and, unlike these conventional designs, describes a step-change with linear contact actuation, whereby the fixed step-contacts along a track extend into the inside of the switch and are actuated by a movable switch mechanism, which is in turn actuated by the drive shaft. The vertical sliding switch mechanism consists of a continuous actuation of the drive shaft-mounted lifting slide, which selects the new fixed steps, and a switch actuated by the lifting slide by means of an energy-saving energy-saving energy-saving drive, which is actuated by the actuator after the actual load has been applied and which is the most efficient means of actuating the new step.

The applicant's claim that the applicant's claim for annulment of the contested decision was based on the fact that the applicant had not been able to demonstrate that the applicant had not failed to fulfil its obligations under Article 85 (1) of the Treaty, in so far as it had not been able to demonstrate that the applicant had not failed to fulfil its obligations under Article 85 (1) of the Treaty, was rejected.

Such load switches are generally known as a fitting switch or a fitting switch. A typical fitting switch usually has a load switch in a separate oil tank for actual uninterrupted load switching and a selector underneath to select the winding socket of the step transformer to be switched to. Such a fitting switch is inserted and mounted from the top completely into the oil-filled transformer boiler.

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Furthermore, it is necessary, as far as the state of the art is concerned, to provide a separate oil circuit for the step switch, which usually also contains a separate protective relay, its own pipes, a separate extender and also a separate dehumidifier.

WO 2011 012 181 A1 describes the arrangement of a step switch in a control transformer with a transformer cap. This known step switch is located below the transformer cap.

The present invention is intended to avoid the disadvantages of these known solutions and to indicate a simple, low cost step switch.

This task is solved by a load level switch as described in claim 1, the subclaims being particularly advantageous upgrades of the invention.

The idea is to attach the load step switch directly to the bottom of the transformer cover by means of a gear module which interacts with the motor drive located on the opposite outside of the transformer cover. The gear module preferably has a flange-like tight module which is located directly on the bottom of the transformer cover and is soluble connected to the motor drive, in particular screwed. According to the invention, this is mounted on the load load meter's drive module. The drive module is also responsible for loading the load by means of the transformer and for loading the load on the outside of the transformer. This means that the load can be easily removed from the transformer cover during the installation of the transformer.

A preferred embodiment of the invention is a support plate made of a dielectric material, in particular plastic, on which the selector contact units are arranged on one side and the vacuum switch tubes on the other side in such a way that the support plate provides the ground clearance necessary for the load switcher.

In another embodiment of the invention, each contact unit is moved during a switch along two essentially parallel control rods, which ensure a linear direction of the contact unit and are held by several cross-sections arranged on the support plate.

In another embodiment of the invention, the movable contactors are each incorporated into a contact support and interact with fixed contactors placed on the support plate in such a way that the individual fixed contactors are switched along the leading rod by a longitudinal displacement of the movable contactors, i.e. the contact unit can be switched along the leading rod. The back and/or back movement of the contact unit switches the individual fixed contactors and thus the control area of the load step monitor passes through. In a particularly simple way, the several sliding cross sections on which the controls are held form a mechanical connection for the control area, so that the control area is also mechanically limited.

In another embodiment, the vacuum tubes are placed directly on the respective slide of the corresponding switchgear unit, and in this embodiment, both the vacuum tubes and the switchgear units are operated by a common motor drive without an energy storage circuit, by means of a central winch which in turn converts the rotational motion into a longitudinal shift of the sliders, which drives the slide so that both the movable switches and the vacuum switches attached to the switchgear units can be operated.

In another embodiment of the invention, the motor drive is driven by both a threaded spindle which in turn is connected to the switchgear and a camshaft by means of which the vacuum switches can be operated, which makes it particularly advantageous to operate the switchgear easily independently of the vacuum switches.

The following is a more detailed description of the invention and its advantages, with reference to the accompanying drawings. Fig. 1a schematic perspective view of an embodiment of the load switch according to the invention;FIG.2a first side view of the load switch according to FIG. 1 where the switch contacts are arranged;FIG. 2a second side view of the load switch according to FIG. 1 where the vacuum switch tubes are arranged;FIG. 3a detailed view of the leads of a load switch according to the invention;FIG.4a further detailed view of the switch contacts of an invention load switch;FIG. 4a further detailed view of the winding contacts of a load switch according to FIG. 5a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 6a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 6a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 6a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 6a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 7a;FIG. 6a;FIG.

A step-change switch 1 of the invention is shown in FIG. 1 in a perspective view, located directly below a transformer cover 2 of a step-change switch not shown in detail. A more detailed description of the components of the step-change switch 1 and their function can be found in the description of the figures below. A step-change switch of this type, which is sufficiently known from the state of the art, comprises a transformer boiler filled with insulation, in which at least one winding is arranged on an iron yoke. This winding is divided into a stem and a control winding, on which several winding taps are provided, forming the control area.which interacts with a motor drive 4 located on the opposite side of the transformer cap 2. The motor drive 4 may be designed, for example, as a commercial stepper motor. The transmission module 3 comprises a flange-shaped seal module 5 located directly on the bottom of the transformer cap 2 and is soluble, in particular screwed, to the motor drive 4. The transmission module 3 is mounted on the entire load level switch 1 so that the transmission module 3 fulfils both the task of holding the load level switch 1 and of hermetically sealing the outside of the transformer by means of the seal module 5. This prevents the twisting of the transformer cover 2 when the transformer is loaded against the transformer 1.

Figures 2a and 2b show the load switch 1 according to the invention in two different perspective side views. Mechanically connected to the transmission module 3 is a support plate 6 of dielectric material to which the individual components of the load switch 1 can be attached. The support plate 6 is made of electrically insulating material and is designed to accommodate all the essential components of the load switch 1. Figure 2a shows the first side of the load switch 1 on which the components of at least one wrench contact unit 7.1, 7.2 and 7.3 are attached to the support plate 6.Each of the elector contacts 7.1 ... 7.3 comprises several switchable fixed elector contacts 8.1 ... 8.5, electrically connected to the winding contacts of the standard winding of the elector, a contact rail 9 connected to a load line LA and a contact support 10.1 ... 10.3 with two spring-loaded, movable elector contacts 11.1 and 11.2 depending on the switching principle, i.e. the reactor or resistance-shift principle, there are intermediate settings in which a movable elector, for example the elector 11.1, is the first to move;The second fixed contact, for example the fixed contact 8.2, adjacent to the first fixed contact, is switched on as a stationary operating position of the load level switch 1. This allows, according to the rectifier switch principle, for 5 fixed contacts 8.1 ... 8.5 shown here, nine stationary operating positions, while for a load switch 1 after the resistance switch-zip, where no means are allowed, there are only 5 operating positions.1 ... 12.3 on two parallel plates, on which the support plate 6 is fixed by means of several cross-sections 13.1 ... 13.X, the guide rods 14.1 and 14.2, so that the individual fixed contact points 8.1 ... 8.5 can be charged by a longitudinal displacement of the movable contacts 11.1 ... 11.3 including the slide slides 12.1 .... 12.3 along the guide rods 14.1 ... 14.2.The other slides 12.1 and 12.3 are connected to the middle slide 12.2 by means of a longitudinally sliding guide slide 17 also located on the other side of the support plate 6. The various tracks 13.1 ... 13.3 on which the guide rods 14.1 and 14.2 are held together form a mechanical connection for the longitudinally sliding contacts 10.1 10.3 ... 12.31 ... 12.3 so that the control range of the load level switch 1 is also mechanically limited.

Fig. 2b shows the second side of the support plate 6 on which the switches are arranged for continuous switching. The switches for continuous switching are in the embodiment of Fig. 2b, vacuum switches 19.1 ... 19.6, whereby two vacuum switches 19.1 and 19.2, 19.3 and 19.4, 19.5 and 19.6 respectively, are each assigned to a phase of the load switch 1 and interact with a corresponding selector contact unit 7.1 ... 7.3.Each of the vacuum tubes 19.1 ... 19.6 comprises a movable switch contact 20.1 ... 20.6 which is articulated on the second side of the support plate 6 with a coupling 21.1 ... 21.6 and a control lever 22.1 ... 22.6 each. At the articulated connection between the corresponding coupling 21.1 ... 21 ... 6 and the control lever 22.1 ... 22.6 there is a rotating coil 23.1 ... 23.6 which is partially articulated on the top 24 of the guide frame 17.so that the vacuum tubes 19.1 to 19.6 can be switched on, i.e. opened or closed, by a longitudinal displacement of the guide frame 17 depending on the profile of the top 24 of the guide frame 17.

Fig. 3 shows a simplified detailed view of the mechanical coupling of the slides 12.1 ... 12.3 with the guide frame 17. The gear module 3 is shown, which transmits a rotation to the spindle 15 via gears not shown here, which in turn transmits the rotation to a spindle nut 16 provided for in the middle slide 12.2, so that the rotation of the spindle 15 is converted into a slide motion of the middle slide 12.2 along the guide bars 14.1 and 14.2.

Figures 4a and 4b show in two different perspectives a further detailed view of the connecting device 7.1 of a phase of the load level switch 1 according to the invention and illustrate this; the connecting devices 7.2 and 7.3 are identical in construction. Therefore, the following explanations also apply to these connecting devices 7.2 and 7.3. The fixed connecting devices 8.1 ... 8.5 are placed on a plastic connecting device 25.1 such as a screw connection shown here. On the support plate 6 the connecting device 25.1 is charged by two spacers 27.1 ... 27.2 which are not shown as overlapping connecting devices.1 on which several knobs 28.1 ... 28.4 are arranged on either side to move vertically the spring-loaded voter contacts 11.1 and 11.2 of the corresponding voter contact unit 7.1 at a longitudinal displacement of the corresponding slide 12.1 by means of the knobs 28.1 ... 28.4 provided for in the control screen 26.1 depending on the contour of the several knobs 28.1 ... 28.4. The contour of the knobs 28.1 ... 28.4 is measured in such a way that the movable voter contacts 11.1 and 11.2 of the voter contact unit 7.1 between two adjacent fixed voter contacts 8.1 ... 8.5 from the currently activated fixed voter contacts, after they have removed 8.1, here, after switching the next contact contact contact,The first is the first, which is the first, which is the second, which is the third, and the third, which is the third, which is the third, and the third, which is the third, which is the third, and the fourth, which is the fourth, and the fourth, which is the fourth, and the fourth, which is the fourth, and the fourth, which is the fifth, and the fifth, which is the fifth, and the sixth, and the sixth, which are the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the seventh, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the sixth, and the seventh, and the seventh, and the ninth, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh, and the seventh and the seventh, and the seventh and seventh.

Fig. 5 shows the contact strip 25.1 ... 25.3 with the control backing 26.1 ... 26.3 and the several pins 28.1 ... 28.4 in each case in a detailed view, by means of which the corresponding movable plunger contacts 11.1 and 11.2 or 11.3 and 11.4 or 11.5 and 11.6 of each plunger 7.1 ... 7.3 during a switch operation move vertically depending on the contour of the pins 28.1 ... 28.4.

In the built-in state of the load switch 1 in a step transformer, the movable switch contacts 20.1 ... 20.6 of the vacuum switch tubes 19.1 ... 19.6 are electrically connected to the spacers 27.1 ... 27.2 and thus ultimately to the corresponding resistance thresholds, while the corresponding fixed contact 18.1 ... 18.6 of the corresponding vacuum switch tube 19.1 ... 19.6 is electrically connected to the contact rail 9 of the corresponding phase.

In Figures 6a and 6b, a further embodiment of a load step switch 1 is shown. The description of the figures merely explains the differences with the previous figures, identical components being described with the same reference marks as in Figures 1 to 5. In this embodiment of the load step 1 the switches for continuous switching, i.e. the switching tubes 19.1 to 19.6, are located directly on the corresponding sliders 12.1 to 12.3 of the respective switch unit 7.1 to 7.3 and are disassembled along this thread spindle 15.In this figure, the spindle nut 16 is not visible, and is arranged in the corresponding slide 12.1 ... 12.3 so that the selector contact units 7.1 ... 7.3 are thus capable of moving in synchrony along the insulating shaft 15. The insulating shaft 15 is composed of several parts and has a coupling tube 28.1 ... 28.2 formed of electrically insulating material between each of the corresponding parts. In addition, an angle drive 29 is provided to transmit the rotational motion of the motor drive 3 to the thread spindle 15. Between the motor drive 3 and the angle drive 29 an insulating drive 30 is arranged from electrical material that directs the rotational motion of the motor drive 3 at an angle 29.The fixed contacts 18.1 ....18.6 of the vacuum switches placed on the corresponding slide 12.1 ... 12.3 19.1 ... 19.6 are each screwed to the support plate 6 by means of strings 31.1 ....31.6 and electrically connected with non-shown resistance throttles. The movable switch contacts 20.1 ... 20.6 of the vacuum switches 19.1 ... 19.6 are connected with a tilt-pipe arrangement 32.1 ... 32.6 in a mechanical action connection, each having a roll 33.1 ... 12.6 In the built-in state of the load step switches 1, the movable switch contacts 20.1 ... 20.6 of the vacuum switches 19.1 ....1 19.6 are electrically connected to the movable contacts 11.1 ... 11.2 33.1 ... 33.2 with the corresponding phase of rotation of the roller.The fixed switchgear contacts 8.1 to 8.5, of which only the fixed switchgear contacts 8.3 to 8.5 are shown in this figure, are located directly on the carrier 6 and on the non-shown opposite side of the carrier 6 are electrically connected to the corresponding winding winding winding of the step transformer.

In FIG. 7a and 7b, a further embodiment of a load level switch 1 according to the invention is shown. Again, this figure describes the differences with the previous figures, referring to identical components with the same reference marks as in FIG. 1 to 5. In the embodiment of FIG. 7a and 7b, the motor drive 3 drives both a winding spindle 15 which is in turn connected mechanically to each of the selector contact units ... 7.1 7.3 and a camshaft 35 by means of which the switching devices are uninterrupted, thus the vacuum switches 19.1 ... 19.16 are removable.6a and 6b, the threaded spindle 15 is formed here as a threaded spindle along its entire length and is engaged with the spindle nut 16 provided for in each of the slides 12.1 ... 12.3 in such a way that, when the threaded spindle 15 is rotated, one of the slides 12.1 ... 12.3 moves horizontally. The remaining switchgear 7.1 ... 7.3 is identical to the switchgear 7.1 ... 7.3 described in FIG. 1 to 5. To operate the vacuum switch tubes 19.1 ... 19.6, each movable switch 20.1 ... 20.6 is mechanically coupled with a lever 36.1 ... 36.6 which is connected to the switchgear 20.1 ... 20.1 by a lever.The control knobs 37.1 ... 37.6 on the corresponding hoist 36.1 ... 36.6 are in a vertical motion and thus finally operate the corresponding movable switch contact 20.1 ... 20.6 of the corresponding vacuum switch tubes 19.1 ... 19.6. Depending on the switch sequence of the load level switch 1 to the hour, several control knobs 37.1 ... 37.6 are provided for perimeter of the control knob 35 per vacuum switch tube 19.1 ... 19.6.

In summary, the load switch 1 of the invention can be used according to the reactors switching principle as well as the resistance-fast switching principle.

The following shall be added:

The following is a list of the main components of the system: 1. the power supply, 2. the power supply, 3. the power supply, 3. the power supply, 4. the power supply, 4. the power supply, 4. the power supply, 4. the power supply, 5. the power supply, 5. the power supply, 5. the power supply, 5. the power supply, 5. the power supply, 5. the power supply, 5. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 6. the power supply, 7. the power supply, 7. the power supply, 7. the power supply, 7. the power supply, 7. the power supply, 7. the power supply, 7. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the power supply, 8. the 7. the power supply, 8. the 7. the power supply, 8. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7. the 7.

Claims (16)

1. On-load tap changer (1) for uninterrupted switching over between different winding taps of a tapped transformer, comprising

   - a selector contact unit (7.1, 7.2, 8.3) which comprises a respective plurality of fixed selector contacts (8.1, 8.2, 8.3, 8.4, 8.5), which are respectively electrically connected with the individual winding taps, and two longitudinally displaceable movable selector contacts (11.1, 11.2) by which by the fixed selector contacts (8.1 ... 8.6) are contactable;

   - two vacuum interrupters (19.1, 19.2, 19.3, 19.4, 19.5, 19.6) for each phase for uninterrupted switching over;

   - a motor drive (4) for introducing a drive movement into the on-load tap changer (1); and

   - a threaded spindle (15);

   characterised in that

   - the entire load changeover switch (1) is arranged by means of a transmission module (3) at the underside of a transformer cover (2);

   - the on-load lap changer (1) has three selector contact units (7.1 ... 7.3);

   - each selector contact unit (7.1 ... 7.3) has a slide carriage (12.1 ... 12.3) and a contact carrier (10.1 ... 10.3);

   - a rotational movement generated by the motor drive (4) is transmissible by means of the transmission module (3) to the threaded spindle (15), which is engaged with a spindle nut provided at a centre slide carriage (12.2), so that a longitudinal displacement of the centre slide carriage (12.2) along guide rods (14.1, 14.2) can thereby be produced; and

   - the remaining slide carriages (12.1, 12.3) are operatively connected with the centre slide carriage (12.2) by way of a similarly longitudinally displaceable guide link (17), which is mechanically coupled with the centre slide carriage (12.2), so that the remaining slide carriages (12.1, 12.3) in turn are so mechanically coupled with the centre slide carriage (12.2) by way of the guide link (17) that not only the selector contact units (7.1 ... 7.3), but also the vacuum interrupters (19.1 ... 19.6) are thereby simultaneously actuable.
2. On-load tap changer (1) according to the preceding claim, wherein

   - the transmission module (3) comprises a flange-like sealing module (5).
3. On-load tap changer according to one of the preceding claims, wherein

   - a support plate (6) of a dielectric material, at the first side of which the selector contact unit (7.1 ... 7.3) and at the second side of which the vacuum interrupters (19.1 ... 19.6) are arranged, is provided.
4. On-load tap changer (1) according to the preceding claim, wherein

   - each slide carriage (12.1 ... 12.3) is received by two parallelly arranged guide rods (14.1, 14.2) which in turn are arranged at the support plate (6) by means of cross members (13.1 ... 13.3).
5. On-load tap changer (1) according to one of the preceding claims and claim 3, wherein

   - at each selector contact unit (7.1 ... 7.3) the movable selector contacts (11.1, 11.2) are received in the contact carrier (10.1, 10.3) and co-operate with the respective fixed selector contacts (81.... 8.5) arranged at the support plate (6).
6. On-load tap changer (1) according to one of the preceding claims, and claim 4, wherein

   - each selector contact unit (7.1 ... 7.3) is arranged to be so displaceable along the guide rods (14.1, 14.2) by means of the respective slide carriage (12.1 ... 12.3) that it is thereby possible to run through the regulating range of the on-load tap changer (1).
7. On-load tap changer (1) according to one of the preceding claims and claim 4, wherein

   - the cross-members (13.1, 13.3) form a mechanical abutment for the selector contact units (7.1 ... 7.3) in such a way that the regulating range of the on-load tap changer (1) is mechanically limited.
8. On-load tap changer (1) according to one of the preceding claims, wherein

   - the movable selector contacts (11.1, 11.2) of a phase in every stationary operational setting connect at least one fixed selector contact (8.1 ... 8.5) of the same phase of the on-load tap changer (1).
9. On-load tap changer (1) according to one of the preceding claims, wherein

   - in each instance two movable selector contacts (11.1, 11.2) are received in a contact carrier (10.1 ... 10.3) to be resiliently mounted.
10. On-load tap changer (1) according to one of the preceding claims and claim 3, wherein

    - each vacuum interrupter (19.1 ... 19.6) comprises a movable switch contact (20.1 ... 20.6) which is pivotably and mechanically in operative connection with a coupling element (21.1 ... 21.6) and a control lever (22.1 ... 22.6);

    - provided at each pivotable connection between the corresponding coupling element (21.1 ... 21.6) and the control lever (22.1 ... 22.6) on the side facing the support plate (6) is a roller (23.1 ... 23.6), which rolls along a profiled upper side (24) of the guide link (17) under partially maintained contact so that the respective vacuum interrupter (19.1 ... 19.6) is connectible by a longitudinal displacement of the guide link (17) in dependence on the profiling of the upper side (24) thereof.
11. On-load tap changer (1) according to one of the preceding claims and claim 3, wherein

    - at each selector contact unit (7.1 ... 7.3) the fixed selector contacts (8.1 ... 8.5) are arranged at a contact strip (25.1 ... 25.3), which contact strips are in turn fastened to the carrier plate (6) by means of respective spacers (27.1 ... 27.3).
12. On-load tap changer (1) according to the preceding claim, wherein

    - each contact strip (25.1 ... 25.3) has at its longitudinal side a control link (26.1 ... 26.3) at which several lobes are arranged on both sides.
13. On-load tap changer (1) according to the preceding claim, wherein

    - at each selector contact unit (7.1 ... 7.3) the profile of the lobes is so dimensioned that the movable selector contacts (11.1, 11.2) between two adjacent fixed selector contacts (8.1 ... 8.5) lift off from the currently connected fixed selector contact, since the movable selector contacts (11.1, 11.2) again connect the next fixed selector contact after switching over has been completed.
14. On-load tap changer (1) according to any one of the preceding claims 1 to 13, wherein

    - two respective vacuum interrupters (19.1 and 19.2, 19.3 and 19.4, 19.5 and 19.6) per phase are directly arranged at the corresponding slide carriage (12.1 ... 12.3) of the respective selector contact unit (7.1 ... 7.3);

    - the motor drive (4) drives the central threaded spindle (15) by means of an angle transmission (29);

    - each slide carriage (12.1 ... 12.3) has a separate spindle nut (16); and

    - the threaded spindle (15) co-operates with each spindle nut (16) and the rotational movement can be converted into a synchronous longitudinal displacement of the slide carriages (12.1 ... 12.3) in such: a manner that not only the movable selector contacts (11.1, 11.2), but also the vacuum interrupters (19.1 ... 19.6) are thereby actuable.
15. On-load tap changer (1) according to claim 1, wherein

    - the motor drive (4) drives not only the threaded spindle (15), which in turn is operatively connected with each selector contact unit (7.1 ... 7.3); but also a camshaft (35), by means of which the vacuum interrupters (19.1 ... 19.6) are actuable, in such a manner that both the movable selector contacts (11.1, 11.2) and the vacuum interrupters (19.1 ... 19.6) are thereby actuable.
16. On-load tap changer (1) according to one of the preceding claims for use in voltage regulation of a distributing transformer.