On-load tap changer

Abstract

Winding taps N1,...,N of tapped transformer 1 J ,...,N N An on-load tap changer 10 for seamlessly switching between selected winding taps N J At least one selector unit 30 for performing preselection in a no-power state to the winding tap N J-1 Preselected N from J the selector unit 30 and the second gear 41 are assigned to the load changer unit 40; and at least one gear transmission 50 having a first gear 31 and a second gear 41, the first gear 31 being assigned to the selector unit 30 and the second gear 41 being assigned to the load changer unit 40; and a drive shaft 60 operated by a motor drive 70, the first gear 31 and the second gear 41 being directly mechanically linked to each other so that the gears 31, 41 can be operated simultaneously, and the drive shaft 60 can drive either the first gear 31 or the second gear 41.

Description

[Technical field]

[0001] The present invention relates to an on-load tap changer that performs uninterrupted load switching between different winding taps of a tapped transformer. [Background technology]

[0002] Known on-load tap changers usually consist of a selector, which preselects, in the no-power state, the respective winding tap to which the transformer is to be switched, and a load changer, which performs the actual load change from the previous winding tap to the new preselected winding tap. The change is performed by mechanical operation of different switches and contacts of the selector and the load changer, which are actuated by a motor drive and a drive shaft. Furthermore, it is known from the prior art to mount an on-load tap changer externally on the transformer housing together with a motor drive and a switch box in which the motor control is located (so-called "add-on changer").

[0003] Patent document 1 discloses a three-phase on-load tap changer in a container mounted on the side of the wall of a transformer oil tank. The on-load tap changer has a selector for preselecting a winding tap of the transformer in the power-free state by means of movable selector contacts, and a load changer with two vacuum switches for carrying out the actual load change. The individual switching and contact elements of the selector and the load changer are operated via a gear transmission.

[0004] During operation, it may become necessary to replace an on-load tap changer, for example due to changing requirements for the on-load tap changer or after a decades-long operating life of the on-load tap changer and the associated degradation phenomena. When replacing an old on-load tap changer with a new one, besides the technical requirements for the on-load tap changer, attention should also be paid to the situation at the site of use, especially the spatial situation, since generally only a limited or defined space is available for on-load tap changers.

[0005] When equipping a new transformer with an on-load tap changer, the on-load tap changer is typically first mounted on the transformer and then the transformer together with the on-load tap changer is transported to the location of use or to the end user, for example by rail car or truck, resulting in limited space being available for the transformer including the motor drive with on-load tap changer and associated switch box. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] GB Patent Publication No. 1114868 Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above, it is an object of the present invention to provide an improved solution for an on-load tap changer which requires less space and can be mounted on a transformer in a manner that is adaptable to the space situation at the site. [Means for solving the problem]

[0008] This problem is solved by the subject matter of the independent claims. Further implementations are the subject matter of the dependent claims.

[0009] The on-load tap changer according to the invention comprises an on-load tap changer for uninterrupted switching between winding taps of a tapped transformer, at least one selector unit for performing a preselection in the power-free state to a selected winding tap, at least one gear transmission with a first gear and a second gear, the first gear being assigned to the selector unit and the second gear being assigned to the load changer unit, and a drive shaft operated by a motor drive, where the first gear and the second gear are directly mechanically engaged with each other so that they can be operated simultaneously. Thus, the first gear is the driving gear and the second gear is the driven gear, or vice versa. By directly mechanically connecting the gears, the selector unit and the load changer unit are likewise operated centrally by the drive shaft, where "directly" specifically means that there are no intermediate parts between the gears.

[0010] The transmission ratio of this gear transmission is advantageously i = 1. As motor drives all types of motors come into consideration, for example motors operating on direct current, motors operating on alternating current, controlled and uncontrolled motor systems.

[0011] This improved solution has the advantage that the structural embodiment of the on-load tap changer, in particular the transmission, which transmits the drive movement of the drive shaft to the operating means of the selector and the load changer as well, allows the drive shaft and the motor drive to be arranged in a variable manner, which makes it possible to flexibly deal with limited space availability during the transportation of the transformer to the place of use or with spatial situations at the place of use, e.g. in a substation or a gas-insulated switchgear.

[0012] In one possible embodiment, the at least one selector unit, the at least one load changer unit, the at least one gear transmission and the drive shaft are arranged in a housing of the on-load tap changer, which housing is preferably sealed against the outside.

[0013] In one possible implementation, the first gear is journalled against rotation on the first gear shaft and the second gear is journalled against rotation on the second gear shaft.

[0014] In one possible embodiment, the first gear and the first gear shaft are integral and the second gear and the second gear shaft are integral.

[0015] In one possible implementation, the first gear shaft is rotatable about a first gear axis and the second gear shaft is rotatable about a second gear axis, the first and second gear axes intersecting at a defined angle, advantageously the first and second gear axes intersecting at an angle of 90°.

[0016] In one possible embodiment, the first gear wheel and the second gear wheel are each configured as bevel gears.

[0017] In one possible embodiment, the basic shape of the bevel gear is configured as a truncated cone with meshing contour surfaces. The meshing can be configured as a straight meshing and / or an inclined meshing. In one possible embodiment, the first and second bevel gears meet at the tip of the meshing.

[0018] In one possible embodiment, the first and second gear wheels are configured identically.

[0019] In one possible embodiment, the drive shaft can be connected against relative rotation with the first gear shaft or the second gear shaft via a clutch, which is preferably configured as a clutch with multiple clutch plates.

[0020] In one possible embodiment, the drive shaft is arranged on an extension of the first gear shaft and / or the first gear shaft when driving the first gear, and on an extension of the second gear shaft and / or the second gear shaft when driving the second gear.

[0021] In one possible embodiment, the motor drive is fixed to the housing of the on-load tap changer by means of a transmission module, which can further be configured as a sealing module, providing that the inner space of the housing of the on-load tap changer is sealed against the outside.

[0022] In one possible embodiment, the on-load tap changer further comprises a switch box, in which the control of the motor drive is arranged, which switch box is configured separately, i.e. spatially separated, from the motor drive and is preferably connected to the motor drive via a cable.

[0023] In one possible implementation, the switch box is fixed to one or more of the housing of the tap transformer, the housing of the on-load tap changer and suitable fixing means, which may for example be a wall at the location where the tap transformer is used.

[0024] In one possible embodiment, the on-load tap changer is configured as a three-phase on-load tap changer, with one selector unit, one load changer unit, one drive shaft and one gear transmission per phase, i.e. three selector units, three load changer units, three drive shafts and three gear transmissions in total.

[0025] In one possible embodiment, the on-load tap changer therefore comprises a first, a second and a third selector unit, a first, a second and a third load changer unit, a first, a second and a third drive shaft and a first, a second and a third gear transmission, the first drive shaft operates the first selector unit and the first load changer unit via the first gear transmission, the second drive shaft operates the second selector unit and the second load changer unit via the second gear transmission, and the third drive shaft operates the third selector unit and the third load changer unit via the third gear transmission.

[0026] In one possible implementation, the drive shafts are mechanically coupled to one another such that the first drive shaft drives the second drive shaft via a first gear transmission, and the second drive shaft drives the third drive shaft via a second gear transmission.

[0027] In one possible embodiment, these gear transmissions are configured as bevel gear transmissions.

[0028] In one possible implementation, the second and third drive shafts are on a common axis.

[0029] In one possible implementation, the first, second and third drive shafts lie on a common axis.

[0030] In one possible implementation, each phase of the on-load tap changer has a respective first gear and a respective second gear and a respective first gear shaft and a respective second gear shaft.

[0031] In one possible embodiment, at least one second gear shaft is arranged between the two drive shafts.

[0032] In one possible embodiment, the drive shaft and the second gear shaft are connected to each other against relative rotation via at least one clutch.

[0033] The present invention will be described in detail below with reference to the drawings based on the embodiments. Components that are the same, functionally the same, or perform the same effect can be given the same reference numerals. The same components or components with the same function are described only with respect to the drawing in which they first appear, if necessary. This description is not necessarily repeated in the following drawings. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is a schematic structural diagram of a tapped transformer equipped with an on-load tap changer according to one embodiment of the prior art. [Diagram 2] Schematic diagram of winding taps on a tapped transformer [Figure 3A] FIG. 1 is a plan view of one embodiment of an improved on-load tap changer; [Figure 3B] FIG. 2 is a plan view of another embodiment of an on-load tap changer according to the improved scheme; [Figure 4A] FIG. 2 is a plan view of yet another embodiment of an on-load tap changer according to the improved scheme; [Figure 4B] FIG. 2 is a plan view of yet another embodiment of an on-load tap changer according to the improved scheme; [Figure 5A] Detailed diagram of on-load tap changer in Figure 3A and 4A [Figure 5B] Detailed view of on-load tap changer in Figures 3B and 4B [Figure 6A] Schematic diagram of a tapped transformer with an on-load tap changer according to one embodiment of the improved scheme. [Figure 6B] FIG. 2 is another schematic diagram of a tapped transformer with an on-load tap changer according to one embodiment of the improved scheme. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] 1 shows a schematic diagram of a tapped transformer 1 with one embodiment of a known on-load tap changer 10 configured as an additional changer. The on-load tap changer 10 has a selector 30 and a load changer 40 and is driven by a motor drive 70 whose control unit is accommodated in a switch box 72 for space reasons. The on-load tap changer 10, the motor drive 70 and the switch box 72 are arranged in a single housing 11.

[0036] Figure 2 shows the different winding taps N1,...,N J ,...,N N The figure shows a schematic diagram of a control winding 2 of a tapped transformer 1 (see FIG. 1) with winding taps N1,...,N J,...,N N is switched on or off by the on-load tap changer 10. This switching off or on can be achieved by any means, e.g. the selector 30, the load changer 40 etc. The operation of the on-load tap changer 10 is performed by a motor drive 70.

[0037] 3A illustrates in plan view one embodiment of an improved on-load tap changer 10. The on-load tap changer 10 includes a housing 11 and a plurality of selected winding taps N1,...,N2 of a control winding 2 of a tapped transformer 1. J ,...,N N (see FIG. 2 ) in the no-power state, and a selector unit 30 for preselecting the previous winding tap N of the control winding. J to a preselected winding tap N (not shown) J+1The on-load tap changer 10 further comprises a load changer unit 40, which performs the actual load change to the load changer 50, and a gear transmission 50, which is configured as a bevel gear transmission and comprises a first bevel gear 31 and a second bevel gear 41. The bevel gears 31 and 41 are configured as truncated cones with meshing contour surfaces and are made of a metallic material, preferably steel. The gears mesh with each other with their meshing contour surfaces, so that the bevel gears 31 and 41 are directly mechanically engaged with each other, i.e. without intervening parts. The first bevel gear 31 is assigned to the selector unit 30 and operates it, and the second bevel gear 41 is assigned to the load changer unit 40 and operates it. The on-load tap changer 10 further comprises a drive shaft 60, the first end 61 of which is connected to the bevel gear transmission 50 and the second end 62 of which is connected to the motor drive 70. The drive shaft 60 is preferably made of insulating material. The motor drive 70 is fixed to the lateral side of the housing 11 by means of a transmission module 71 for the extension of the drive shaft 60, in particular a sealing module which seals the interior space of the housing 11 from the outside. In this embodiment, the drive shaft 60 directly drives the bevel gear 41, i.e. the load changer unit 40. Due to the mechanical engagement connection between the bevel gear 31 and the bevel gear 41, the rotational movement of the bevel gear 41 is directly transmitted to the bevel gear 31, so that the selector unit 30 is operated in the same way as the load changer unit 40.

[0038] 3B shows in plan view another embodiment of the on-load tap changer 10 according to the improved scheme. In this implementation, the drive shaft 60 drives the bevel gear 31, i.e. the selector unit 30, directly. Due to the mechanical engagement connection between the bevel gears 41 and 41, the load changer unit 40 is operated in the same way as the selector unit 30. The motor drive 70 is fixed to the front side of the housing 11 by means of a gearing unit 71 to the extension of the drive shaft 60.

[0039] 4A shows a plan view of yet another embodiment of an on-load tap changer 10 according to an improved system. Here, the on-load tap changer 10 is configured, for example, as a three-phase on-load tap changer and therefore has a total of three selector units 30, 81, 91, three load changer units 40, 82, 92, three drive shafts 60, 80, 90 and three gear transmissions 50, 83, 93. The drive shaft 60 operates the selector unit 30 and the load changer unit 40 via the gear transmission 50, the drive shaft 80 operates the selector unit 81 and the load changer unit 82 via the gear transmission 83 and the drive shaft 90 operates the selector unit 91 and the load changer unit 92 via the gear transmission 93. The three phases, which can be divided into the selector unit 30, 81, 91, the load changer unit 40, 82, 92, the drive shaft 60, 80, 90 and the gear transmission 50, 83, 93, are all arranged in one housing 11. These drive shafts 60, 80, 90 are arranged on a common axis A and are mechanically connected to each other in such a way that the first drive shaft 60 drives the second drive shaft 80 via the gear transmission 50, which in turn drives the third drive shaft 90 via the second gear transmission 83. The first drive shaft 60 is driven by a motor drive 70, which is arranged on the side of the housing 11 with respect to the extension of the drive shaft 60. This drive shaft transmits the drive motion to the gear transmission 50. Therefore, all three phases with the selector unit 30, 81, 91 and the load changer unit 40, 82, 92 are driven centrally by the drive shaft 60.

[0040] FIG. 5A shows a detailed view of the on-load tap changer 10 of FIGS. 3A and 4A, illustrating the mechanical connection between the first drive shaft 60 and the second drive shaft 80 via the bevel gear transmission 50. In the embodiment according to FIG. 4A, the connection between the second drive shaft 80 and the third drive shaft 90 is configured homomorphically. The first bevel gear 31 is arranged rotationally fixed to the first gear shaft 32, and the second bevel gear 41 is arranged rotationally fixed to the second gear shaft 42. These gear shafts 32 and 42 are advantageously made of a metallic material, for example steel. The first gear shaft 32 is journalled rotatably about a gear axis 33, and the second gear shaft 42 is journalled rotatably about a gear axis 43. The first gear axis 33 and the second gear axis 43 intersect in a plane at a defined angle α, which is advantageously configured as a right angle. The selector unit 30 comprises a driver 34 which is connected for relative rotation to a first gear shaft 32 and which selects winding taps N1, . . . , N2 (not shown) of a control winding 2 of a tapped transformer 1. J ,...,N N 2. The load switch unit 40 operates a movable selector contact (not shown) which contacts one winding tap N of the control winding 2. J A preselected (not shown) winding tap N J+1The actuator 44 comprises an operating means 44 for an opening / closing element (not shown) which performs the actual load switching to the load switcher unit 40. The operating means 44 is configured as a cam disk 44 which is connected to the gear shaft 42 so as not to rotate relative to the load switcher unit 40, the rotation of which opens and closes the opening / closing element (shown), for example via a lever mechanism. The opening / closing element (not shown) can advantageously be configured as a vacuum opening / closing tube. For example, one cam disk 44 is provided for each vacuum opening / closing tube. The drive shaft 60 is arranged along the second gear axis 43 with respect to the extension of the second gear shaft 42 and has a first end 61 which is connected to the second gear shaft 42 so as not to rotate relative to the load switcher unit 40 via a clutch 63. A motor drive 70 is arranged at the second end 62 of the drive shaft 60 and drives the drive shaft 60 via a clutch 64. The rotation of the drive shaft 60 and the gear shaft 42 within 360° performs the operation of the load switcher unit 40 and the operation of the selector unit 30 (by the coupling of the bevel gears 41 and 31). The transmission of motion between the drive shafts 60 and 80 is effected via a clutch 63 and the second gear shaft 42, as well as via another clutch 84 which connects the drive shaft 80 against relative rotation with the second gear shaft 42. Advantageously, these clutches 62, 64 and 84 each have two clutch plates, but in principle any type of shaft coupling can be employed.

[0041] Figure 4B shows a plan view of another embodiment of an on-load tap changer 10 according to an improved scheme, which is also configured, for example, as a three-phase changer. In this embodiment, the motor drive 70 is arranged on the front side of the housing 11 with respect to the extension of the drive shaft 60, as in the embodiment shown in Figure 3B, i.e. the drive shaft 60 directly drives the first gear 31, as will be explained in more detail below based on the description of Figure 5B. The connection between the second drive shaft 80 and the third drive shaft 90 is configured similarly to the arrangement shown in Figure 5A.

[0042] Figure 5B shows a detailed view of the on-load tap changer 10 of figures 3B and 4B. Here, a drive shaft 60 is arranged along the first gear axis 33 relative to the extension of the first gear shaft 32 and its first end 61 is connected to the first gear shaft 32 in a rotationally fixed manner via a clutch 63. The drive shaft 60 thus directly drives the first gear 31 which in turn transmits motion to the second gear 41 which is further arranged in a rotationally fixed manner to the second gear shaft 42. Via this clutch 84, the rotational motion is transmitted from the second gear shaft 42 to the second drive shaft 80.

[0043] 6A shows a schematic diagram of a tapped transformer 1 with an embodiment of an on-load tap changer 10 according to an improved scheme. In this embodiment, the on-load tap changer 10 is realized as an additional changer, accommodated in a housing 11 and arranged outside the transformer housing 3 in the transformer housing. This motor drive 70 is attached to the side of the housing 11 of the on-load tap changer 10. The associated switch box 72 is mounted in the transformer housing 3 and is connected to the motor drive 70 via a cable 73.

[0044] 6B shows another schematic diagram of a tapped transformer 1 with an embodiment of an on-load tap changer 10 according to the improved scheme. In this embodiment, a motor drive 70 is mounted on the front side of the housing 11 of the on-load tap changer 10. An associated switch box 72 is also arranged on the front side of the housing 11 of the on-load tap changer 10 and is connected to the motor drive 70 via a cable 73.

[0045] However, the arrangement of the switch box 72 is not limited to the illustrated embodiment, and the switch box 72 can be fixed essentially anywhere at the transformer's location, for example on a nearby wall, within a predetermined distance relative to the on-load tap changer 10, depending for example on the cable length and / or the drive type, for flexible cable connection.

[0046] With this improved design of the on-load tap changer 10, it is possible to flexibly deal with different space prerequisites during transportation to the place of use or directly at the place of use. The motor drive can be mounted in a variable manner on the front or on the side of the housing of the on-load tap changer. Likewise, the switch box can be arranged in a variable manner separately from the motor drive and the on-load tap changer. This is advantageous, for example, when replacing an old on-load tap changer with a new one, since in some cases only limited space is available for mounting the new on-load tap changer in the transformer housing, for example the space previously occupied by the old on-load tap changer. Furthermore, this improved design is advantageous, for example, when transporting a transformer with an on-load tap changer. In particular, in the case of an add-on, the on-load tap changer with its associated motor drive and switch box requires additional space. This improved solution makes it possible to transport the on-load tap changer together with the transformer in a space-saving manner, for example by making the best possible use of the space available in a freight car or truck. Furthermore, this improved solution also allows the associated switch box to be transported separately and only later installed at the place of use in a suitable position (see Figures 6A and 6B), so that different space situations during transport and at the place of use can still be flexibly addressed.

[0047] It is believed that the present disclosure and many of its attendant advantages will be understood from the foregoing description. It will further be apparent that various changes in the shape, construction and arrangement of the components may be made without departing from the subject matter disclosed or without surrendering all of its material advantages. The embodiments described herein are merely illustrative, and such changes are intended to be encompassed by the following claims. It is further understood that the invention is defined by the following claims. In addition to the invention described in the claims, the disclosure of this application also includes the following: 1. Winding tap of tapped transformer (1) (N 1 ,...,N J ,...,NN 1. An on-load tap changer (10) for seamlessly switching between a Selected winding tap (N J At least one selector unit (30) for performing pre-selection in a power-free state to The previous winding tap (N J-1 ) preselected from (N J At least one load switch unit (40) for performing the actual load switching to the at least one gear transmission (50) comprising a first gear (31) and a second gear (41), the first gear (31) being assigned to a selector unit (30) and the second gear (41) being assigned to a load changer unit (40); a drive shaft (60) operated by a motor drive (70); In an on-load tap changer having The on-load tap changer is characterized in that the first gear (31) and the second gear (41) are directly mechanically engaged with each other so that the gears (31, 41) can be operated simultaneously. 2. In the on-load tap changer (10) described in the above paragraph 1, The at least one selector unit (30), the at least one load changer unit (40), the at least one gear transmission (50) and the drive shaft (60) are arranged within a housing (11) of an on-load tap changer (10). 3. In the on-load tap changer (10) described in the above paragraph 1, A load changer unit, characterized in that the first gear (31) is journalled to a first gear shaft (32) so as not to rotate relative thereto, and the second gear (41) is journalled to a second gear shaft (42) so as not to rotate relative thereto. 4. In the on-load tap changer (10) according to the above item 3, The first gear (32) is rotatable about a first gear axis (31) (see FIG. 5 ), and the second gear (41) is rotatable about a second gear axis (43), A load changer unit characterized in that the first and second gear axes (33, 43) intersect at a defined angle (α). 5. In the on-load tap changer (10) according to any one of 1 to 4 above, A load switching unit, characterized in that the first gear (31) and the second gear (41) are configured as bevel gears. 6. In the on-load tap changer (10) according to any one of 1 to 5 above, A load changer unit, characterized in that the drive shaft (60) can be connected to the first gear shaft (32) or the second gear shaft (42) so as not to rotate relative to each other via a clutch (63). 7. In the on-load tap changer (10) according to any one of 1 to 6 above, A load changer unit characterized in that the drive shaft (60) is arranged on the first gear axis (33) when driving the first gear (31), and on the second gear axis (43) when driving the second gear (41). 8. In the on-load tap changer (10) according to any one of 1 to 7 above, A load changer unit, characterized in that the motor drive (70) can be fixed to the housing (11) of the on-load tap changer (10) by means of a transmission module (71). 9. In the on-load tap changer (10) according to any one of 1 to 8 above, The load switching unit further comprises a switch box (72) configured separately from the motor drive unit (70). 10. In the on-load tap changer (10) according to any one of 1 to 9 above, second and third selector units (81, 91); second and third load switching units (82, 92); second and third drive shafts (80, 90); second and third gear transmissions (83, 93); having The second drive shaft (80) operates a second selector unit (81) and a second load changer unit (82) through a second gear transmission (83); The load changer unit is characterized in that the third drive shaft (90) operates a third selector unit (91) and a third load changer unit (92) via a third gear transmission (93). 11. In the on-load tap changer (10) according to the above 10, The drive shafts (60, 80, 90) are mechanically connected to each other such that the drive shaft (60) drives a second drive shaft (80) through the gear transmission (50), and the second drive shaft (80) drives a third drive shaft (90) through a second gear transmission (83). 12. In the on-load tap changer (10) according to the above 10 or 11, A load changer unit, characterized in that the second drive shaft (80) and the third drive shaft (90) are on a common axis (A). [Explanation of symbols]

[0048] 1 Tapped transformer 2. Control winding of tapped transformer 1 3 Transformer housing 10 On-load tap changer 11. Cabinet 30 Selector Unit 31 First Gear 32 First Gear Shaft 33 First gear shaft 34 Driver of selector unit 30 40 Load Switch Unit 41 Second Gear 42 Second Gear Shaft 43 Second Gear Shaft 44 Cam disc / operating means of load change unit 40 50 Gear transmission 60 Drive shaft 61 First end of drive shaft 60 62 second end of drive shaft 60 63 Clutch at first end 61 64 Clutch at second end 62 70 Motor drive unit 71 Transmission Module 72 Switch Box 73 Cable 80 Second Drive Shaft 81 Second selector unit 82 Second load change unit 83 Second Gear Transmission 84 Clutch 90 Third Drive Shaft 91 Third Selector Unit 92 Third load change unit 93 Third Gear Transmission α angle A-axis N1,...,N J ,...,N N Winding tap of tapped transformer 1

Claims

1. Winding taps (N １ , . . . , N Ｊ , . . . , N Ｎ 1. An on-load tap changer (10) for seamlessly switching between a Selected winding tap (N Ｊ At least one selector unit (30) for performing pre-selection in a power-free state to The previous winding tap (N Ｊ－１ ) preselected from (N Ｊ At least one load switcher unit (40) for performing the actual load switch to the at least one gear transmission (50) comprising a first gear (31) and a second gear (41), the first gear (31) being assigned to a selector unit (30) and the second gear being assigned to a load switch unit (40); a drive shaft (60) operated by a motor drive (70); having The first gear (31) and the second gear (41) are directly mechanically engaged with each other so that the gears (31, 41) can be operated simultaneously; The first gear (31) is journaled on a first gear shaft (32) so as not to rotate relative thereto, and the second gear (41) is journaled on a second gear shaft (42) so as not to rotate relative thereto; In an on-load tap changer, said first gear shaft (32) is rotatable about a first gear axis (33) and said second gear shaft (42) is rotatable about a second gear axis (43), said drive shaft (60) can drive said first gear (31) or said second gear (41); 1. An on-load tap changer, characterized in that the drive shaft (60) is arranged on a first gear axis (33) when driving a first gear (31), and on a second gear axis (43) when driving a second gear (41).

2. An on-load tap changer (10) according to claim 1, The at least one selector unit (30), the at least one load changer unit (40), the at least one gear transmission (50) and the drive shaft (60) are arranged within a housing (11) of an on-load tap changer (10).

3. An on-load tap changer (10) according to claim 1, A load changing unit, characterised in that said first and second gear axes (33, 43) intersect at a defined angle (α).

4. An on-load tap changer (10) according to any one of claims 1 to 3, A load switching unit, characterized in that the first gear (31) and the second gear (41) are configured as bevel gears.

5. An on-load tap changer (10) according to any one of claims 1 to 4, A load changer unit, characterized in that the drive shaft (60) can be connected to the first gear shaft (32) or the second gear shaft (42) so as not to rotate relative to each other via a clutch (63).

6. An on-load tap changer (10) according to any one of claims 1 to 5, A load changer unit, characterized in that the motor drive (70) can be fixed to the housing (11) of the on-load tap changer (10) by means of a transmission module (71).

7. An on-load tap changer (10) according to any one of claims 1 to 6, A load switching unit further comprising a switch box (72) configured separately from the motor drive section (70).

8. An on-load tap changer (10) according to any one of claims 1 to 7, second and third selector units (81, 91); second and third load switching units (82, 92); second and third drive shafts (80, 90); second and third gear transmissions (83, 93); having The second drive shaft (80) operates a second selector unit (81) and a second load changer unit (82) through a second gear transmission (83); The load changer unit is characterized in that the third drive shaft (90) operates a third selector unit (91) and a third load changer unit (92) via a third gear transmission (93).

9. An on-load tap changer (10) according to claim 8, The drive shafts (60, 80, 90) are mechanically connected to each other such that the drive shaft (60) drives a second drive shaft (80) through the gear transmission (50), and the second drive shaft (80) drives a third drive shaft (90) through a second gear transmission (83).

10. An on-load tap changer (10) according to claim 8 or 9, A load changing unit, characterized in that the second drive shaft (80) and the third drive shaft (90) are on a common axis (A).

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